Opnsense wireguard mtu. 2, rewritten WireGuard kernel plugin plus much more.

Opnsense wireguard mtu One site needs a firewall rule on WAN (51820 or 27836, chose one) for UDP. All FW's are running on ESXi 6. Setting a DNS Server at this stage will override all of OPNsense's DNS configurations. (Road Warrior), I have no issues with packet loss, so it must be an issue with the second OPNsense firewall - both Wireguard Instances have default MTU. 1 Tunnel Address: the 'Address' listed in The only plugin installed on OPNsense is WireGuard. In fact, the only way I can administer the remote firewall is using the WG tunnel, so it works. I noticed also that when I make a change in the opnsense wireguard instances or peer config and hit apply, I need to go to gateway-configuration and hit apply there for ipv4 and ipv6 to be In this setup example, there are two OPNsense firewalls - Site A and Site B - that should communicate over the internet via Layer2. So we need to set an MSS maximum of 1380. IPsec or Wireguard are recommended, since they can create simple point to point VPNs between loopback interfaces. So in essence it's WAN MTU 1500 WireGuard MTU (IPv4 peers): 1440 WireGuard MTU (IPv6 peers): 1420 (WireGuard default) Then to workout the MSS, it's matter of just taking off 40 off the WireGuard MTU so that would be 1400 for a WireGuard MTU of 1440. net) with the WireGuard Public Key. I used Jonny's Wireguard PIA setup script which did its job. 0/0"? Both of the latter are super slow, like 100-400kbps. 9_1-amd64 This is based on the OPNsense docs on azire-vpn road warrior example. l, so 1492 need a MTU on wireguard of 1412. opnsense. Interface select "WAN ix1 = OPNsense LAN, MTU 1500 ix2 = OPNsense WAN, outbound NAT active, MTU 1500 Testing Doing iperf3 tests between ServerA and ServerB, I can reach with 1 stream up to 3. 4. Certainly avoids all the weird problems you get with other UDP based VPNs if you miscalculate the MTU. List of DNS servers that will be used to resolve peer endpoint-names. 1. However wireguard has a 60byte header, so the MTU of the encrypted tunnel itself between endpoints needs to be 1500-60=1440 or you will run into fragmentation issues which then reduces your throughput. Its 1500 default. In After the WireGuard Local and and Endpoint configuration, don't forget to add: Access rule on the WAN interface from any to the WAN address on the WireGuard port. You signed out in another tab or window. 255 groups: tun wireguard OPNSense Wireguard "Local Configuration" for each subnet is as follows: For instance "0" the following items are filled in, Name, Public Key, Private Key, Listen Port OPNsense 21. conf: . We will continue to use OPNsense's DNS configs by leaving this blank, and we will take care of DNS leaks later on. 2_1-amd64 FreeBSD 13. Additionally, I'm trying to connect to the VPS with my laptop remotely and reach my internal subnet behind OPNSense. It no longer works after the required reboot of today's update to 18. Switch to the wireguard-go - in the firmware/plugins. 6 Adding a WireGuard Peer Navigate to the Server Status page, select the WireGuard server you want to connect to and note its Hostname (xx. 9, installed on a physical server with 128GB Ram, Intel(R) Xeon(R) Silver 4316 CPU @ 2. This is wrong in case of a PPPoE connection as PPPoE adds 8 Byte on its own. 9. fichtner added the feature Adding new functionality To set up a WireGuard VPN to ProtonVPN we assume you are familiar with the concepts of WireGuard that you have read the basic howto MTU. hazymat; Newbie; Posts 5; Logged; Re: OpnSense traffic is being blocked by my router/modem. address allowed, it also works. Often you have to reduce your MTU size on the WAN interface for PPPoE, a MTU sizes of 1492, 1488, 1460 or1954 are common, if you still encounter issues, start with 1400 and increase it in increments of 4 until you encounter an issue. 1_3-amd64 and are trying to set up a wireguard instance for road warrior use base on the documentation found here: Public Key: ***** Private Key: ***** Listening Port: 51820 MTU: (empty) DNS Servers: (empty) Tunnel Address: 192. I am having trouble getting my client to connect to my OPNSense Wireguard server. Because of this i changed the tunnel MTU inside the Wireguard settings to 1412. It should be as high as possible. Therefore it will be not possible to cause an overflow. 2/32 -interface wg0 It is showing installed on the two other sites I have Opnsense running and all running os-wireguard 1. DNS servers: Enter the DNS IP address from the configuration file. Is there anything I can do to reduce the latency? Thanks If this is correct, should I expect any issues when configuring the same wireguard local peer twice (same private key)? Can I re-use the same wireguard endpoint on the second wireguard local peer and simply add "::/0" in the allowed IPs of the wireguard endpoint, additionally to the already present "0. 4_1 (OPNsense plugin) A wireguard config file from your VPN provider; Steps. Click Add 2. 863080 IP (tos 0x0, ttl 64, id 7009, offset 0, flags [none], proto ICMP (1), length 56) x. Main Menu We're using an OPNsense 24. . I have forced them manually to 1200 MTU and 1000 MSS, and suddenly everything went back to working, with all traffic flowing to Mullvad and out from there. 2. Hoare felix eichhorns premium katzenfutter mit der extraportion energie Of note is also the largely rewritten backend for the WireGuard kernel module plugin which offers separate services for each instance much further improve PPP MTU handling Your OPNsense team--[1] https: I have just upgraded to a fibre connection which is 1Gbit. Navigation Menu Toggle navigation. Lastly, for DNS Leak protection, you should ensure that your DNS resolver (most likely your OPNsense machine) is included under an Alias to be routed through one of your Wireguard connections. xxx/32 In/out packets 0 / 0 (0 bytes / 0 bytes) In/out packets (pass) 0 / 0 (0 bytes / 0 bytes) In/out Opnsense is working for me with wireguard and my provider Edit. WG-server # /etc/wireguard/wg0. If the connection closes, its most likely a Wireguard MTU I followed this tutorial to setup my Wireguard configurations. 1 OPNsense Goal: Set up one or more Wireguard connections from ProtonVPN on OPNsense, with policy based routing, and optional Killswitch. when I try and stream certain videos (iptv) I get really bad buffering. “ping -f” tells ping not to fragment the packet under any circumstances. 2/24 - Peers: FW1 - Gateway: 10. Today I read about the MSS clamping (https://github. 1 plugin Next up, open your browser and enter your OPNsense interface. OPNsense Forum English Forums Virtual private networks # OPNsense [Peer] PublicKey = PublicKeyB PesharedKey = PSKB AllowedIPs = 10. Without MSS clamping you would need to lower the MTU on the devices running the web browsers. Dear all, Just updated to: OPNsense 22. All this works well, but I'm curious about a point in the instructions maybe someone can advise on. If you experience The route out is over a Wireguard VPN with a MTU of 1420. This something broke many previously implemented Wireguard to private VPN service tunnels. Whats the opposite side’s address? ping 10. 7-amd64 with os-wireguard 1. Picture 1 - Wireguard Logs Picture 2 - Tried changing the Gateway to ProtonVPN, didnt work I have wireguard-go implemented in multiple OPNsense instances running 21. Chose a tunnel IP. disable_routes. 0/24 to the allowed IPs, or the traffic is not allowed to that net. I have a test server and client that I use consistently to test my speeds. (other than the need to manually tune MTU on the VM MTU tuning iPerf over clearnet and other WireGuard tunnels (like those coming from my VPS) Ping "flood" to find out if packets get dropped (part of MTU troubleshooting) Actually using another NIC type I have not done: Passing thru the hardware NIC Yanking everything outta my window If you are missing some information please ask me. 22. 16 Fixing OpenVPN MTU Issues. 2 kernel module - core inclusion of the os-firewall and os-wireguard plugins (os-wireguard plugins are no longer available in v24. 2, rewritten WireGuard kernel plugin plus much more. 30. conf [Interface] Address = 172. You may hate it, but in the end, you always come back to it. ivpn. Nothing else. OPNsense 24. B. almost 500Mb for my wan fiber line 2. (disable it once, enable it back to force a restart) When i configure wireguard and look at the wg0 interface using ifconfig i see a MTU of 1420 (1500 - 80 for the Wireguard header). x kernels show the same speeds, but FreeBSD 14 has Currently running OPNsense 24. and than bridge this vxlan via bridge to an outside interface. This works flawlessly until I reboot. 0/24` subnet. 16. 2/32 PersistentKeepalive = 25 ``` ## OPNsense Configuration I have an OPNsense 24. I tried changing the MTU to 1320 and that did not help either. For me (I use PPPoE) the wireguard MTU of 1412 and MSS of 1352 works. I think problem is MTU. Setting an MSS value of Hello people! As stated in the subject above, I'm trying to setup a service with Wireguard as my main entrypoint, which transfers to OPNsense, which is then directed by the nginx plugin, allowing for domain name input, instead of using a port number. On the WAN side it is connected to an ISP provided router/modem. 3_3. x > x. 2; os-wireguard 1. fichtner assigned mimugmail May 11, 2019. I've got the same (or maybe similar) problem Try to remove the peers under your local configuration. Only way to resolve issue is to restart Wireguard (Disable / Enable in Wireguard Settings) 24. 1, I'm not able to access any of my local network resources. The only time this needs to be adjusted lower is if you are using IPv6 on the outside of the tunnel and the MTU between host is less then 1500 such as a Set OPNsense WireGuard interface MTU=1412. com Here's the behavior I'm seeing when I activate the WireGuard tunnel and Gateway in OPNSense: I can ping everything successfully; Traceroute shows that traffic is going out through the WireGuard tunnel; For the record, I had removed all MTU settings and was using default for everything after testing many combinations. 11. OPNsense Forum » Archive » 20. After changing the MTU for my laptop's wireguard config, things starting working. 3 and 21. e. Thought I would try Wireguard client connection to PIA. I previously had cellular service through Mint Mobile and I had my Pixel 6 configured to connect to my home OPNSense box on an Xfinity cable connection. Skip to content. x. If i connect directly with my laptop and Mullvad wireguard i get speeds about 5% slower than than the native connection. My uplink is somewhat more than 400 MBit/s, so definitely limited by Wireguard performance here. 1 Wireguard performance: 1800MBit--> So the Ryzen 5700G is 3x faster compared to the MTU/MSS optimization For now i have set thte MTU according to the default setting of AirVPN. I am stumped. MTU (visible if the Advanced mode was checked): leave default or use 1420 if you face problems with some sites not loading or being very slow DNS Server: 10. ### WireGuard #### Local Add a server by pressing the little + icon May 20 15:57:57 <host-removed> ospfd[2077]: [EC 100663299] *** sendmsg in ospf_write failed to 224. Running opnsense 23. flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1492 When i configure wireguard and look at the wg0 interface using ifconfig i see a MTU of 1420 (1500 - 80 for the Wireguard header). mtu. When an interface for WireGuard receives a packet, this could be from port forwarding or an open interface, it attempts to identify it. 168 Wireguard Site-to-Site + Selective routing is buggy! Main Menu Home; Search; Shop My first thought was this was an MTU issue, but I dropped the MTU all the way to 900 and it still acts exactly the same (WAN on site A uses PPPOE fiber so MTU shouldn't need to be smaller than 1412). All I did was disable IPv6 and the DNS Resolver, and I gave a system a public DNS server. One Wireguard VPN tunnel does not start after upgrade to 22. integer. Server has gigabit internet and client has approximately 40-50MB/s. I even tried it with a WireGuard tunnel yesterday evening. Your private key, your public key, servers public key, the endpoint address and the port. 7 and are on OPNsense version 19. 2 OPNsense is running inside a virtual machine on a Proxmox 6. 5_3 at Sun Apr 14 07:59:58 UTC 2024 Fetching changelog information, please wait done Updating OPNsense repository catalogue Fetching meta. (Tunnel Interface MTU) - 60 = (Wireguard MTU), note this must be set on both Wireguard Clients/server. My home network runs under 192. 1 Wireguard performance: 1800MBit--> So the Ryzen Hi All, I just upgraded my firewall from 20. OPNsense Forum English Forums General Discussion Every VPN has an overhead, for Wireguard the MTU is 1420 and the MSS 1380. Wireguard itself, or the particular /32 configuration that is common in Wireguard, I can't say. In the logs I see correct source and destination IP address and port 51820/udp (pass). This is the first draft of this howto, i might add (more) screenshots later on. disableroutes. 2. 254/24 Disable OPNSense WireGuard Setup Guide This guide was produced using OPNSense 24. This script automates the process of getting Wireguard setup on OPNsense to connect to PIA's NextGen Wireguard servers. Reload to refresh your session. Also the hardware at all three sites is identical. [user@OPNsense ~]$ dig google. 1m 14 Dec 2021 And already previously I had troubles getting the Wireguard interface up. Windows laptop is tethered to my Tmobile Cell Phone. r/opnsense [edit] - mtu set to 1280 on both wireguard int and local wireguard settings Symptoms: Internet sites pingable Names can be resolved and pinged Google search works fine Reddit loads but is intermittent / slow nearly all other websites do not work I can google fine, but trying to load the site seems to There should be an option to set the WireGuard Interface's MTU. MTU = 1380 [Peer] AllowedIPs = 0. 1 router running on a Protectli FW2B. Where in the OPNsense logs can I check those 3 cases? The packets reach the OPN server. After the upgrade the wireguard vpn service was showing down, but when I tried to start the service it's not starting. There are no messages, so I'm having difficulty determining what is causing the interface to not stay up. 0/0), load web pages, etc without issue. Wireguard on Opnsense has Local has tunnel address set to 10. 1 MTU = 1300 [Peer] PublicKey = XXX PresharedKey Virtual private networks. ) The initial part of the WireGuard MullvadVPN Road Warrior Setup guide can I'm trying to set up Wireguard on Opnsense 23. I have followed every step but for some reason, I get odd network login errors when the VPN is enabled. By utilizing the command ping -D -s <packet_size> <destination_ip> in the PFsense router shells on both ends, I successfully I'm using surfshark on the opnsense, basically wireguard the kernel plugin doesnt work well. OPNSense HW APU2D2 - deceased N5105 - i226-V | Patriot 2x8G 3200 DDR4 | L 790 512G - VM HA(SOON) N100 - i226-V | Crucial 16G 4800 DDR5 | S 980 500G - PROD It is the MTU and MSS settings, seems the packets flowing through WG are not happy at all about the default sizes and something is preventing the communication to resolve this. 1 netmask 0xffffff00 broadcast 10. WireGuard receiving a packet. wireguard: add MTU when set on the instance. mine is 1300 and I get full speeds. Wireguard is THE BEST VPN. mtu = 1420 mss = 1420 ip configuration = none See attached my config - keys marked off for security reasons I'm hoping the new 24. 0/0). 0/0 as the Allowed IPs for the WireGuard peer, LAN devices lose internet access entirely. I set 1412 as the MTU on my wireguard interface and it rebooted the Firewall but found even after reboot the overview area showed MTU of 1420 still on the WG interface. 6 and I can't get WG to reply to my clients. “ping -l” tells ping the packet size to use. Let's try to configure OPNsense. If the WG encrypted packet is somewhere on the path fragmented you could have such issues. kasper93; Newbie Last thing we need to set up is maximum MSS for TCP packets, which is 40 bytes smaller than the MTU of WireGuard, by default Wireguard uses 1420 bytes MTU. It was pretty easy to setup and I like the speed and simplicity of it. 4, I have the wireguard client with a tunnel setup for Mullvad. - MTU: 1412 (That's what Wireguard defaults to, also tried 1404 to account for PPPoE overhead) - MSS Is it only needed in client config or do I need to lower the MTU for the OpenVPN interface on the OPNsense, too? Tried it today with in client and server (TCP server): Code: tun-mtu 1440 mssfix But still connection issues. And MTU does not fix the issue. I have a firewall rule that accepts incoming WG packets (UDP port 51820 on WAN interface) and, when I enable logging, I see firewall log messages showing that the packets arrive and are passed. It's because you run a WireGuard router, which forwards traffic between the WireGuard interface and another interface(s). Deciso DEC750 People who think they know everything are a great annoyance to those of us who do. You can do this using the ping command. So Now go to VPN > WireGuard and re-enable it by re-checking the Enable WireGuard checkbox and Save. Configure Gateway. kind regards chemlud ____ "The price of reliability is the pursuit of the utmost simplicity. In fact you can setup the Wireguard VPN with MTU=1500 and it just works, with 1500 byte packets going through the tunnel! I guess it must be slightly less efficient that way though. The header size for IPv4 is usually 20 bytes, and for TCP 20 bytes. Then there is a site to site VPN set up between the two (wireguard) which is instance 2. FreeBSD 13. I was able to fix Proxmox, I changed the MTU of the NICs to 1300 and I started to get OK speeds through Mullvad. NOTE: This value needs to be 80 bytes shorter than the normal MTU but the default is 1420. Establishing a VPN between OPNsense and Proton VPN, using WireGuard, ensures the confidentiality of all data passing through the secure tunnel between the two endpoints. Author Topic: WireGuard VPN not functioning despite following guide precisely (Read 6016 times) WireGuard on OPNsense. So the end result is a WireGuard MTU of 1440. done Fetching packagesite. I have tried changing MTU and simplifying the routing tables. The following example covers an IPv4 Site to Site Wireguard Tunnel between two OPNsense Firewalls with public IPv4 addresses on their WAN interfaces. That will force DNS requests to go through the VPN, but past that you will need to configure DNS over TLS or DNS over HTTPS using Unbound DNS, which is Wireguard is configured with an MTU of 1380 on both, the wireguard config (both ends) and on my wg0 interface on my opnsense. 5GBit, with more streams, I can saturate the 10Gbit interfaces. I also have virtual OPNSense running in the Proxmox that is used by VMs in that Proxmox and those I were able to get to work by putting LAN interface MTU to 1300 and MSS to 1260. 7, the updates, the WireGuard plugin and restoring the configuration the WireGuard interface comes up and stays up. As far as I can guess, I would need to A) create a new gateway on the wireguard interface I recently switched over from PFsense to OPNsense. While I am able to connect to it and use the internet in it and connect to my opnsense on 10. It's entirely wireguard that's not configured right. On the other end, I have an Opnsense 23. wireguard_general Context: My OPNsense router serves as a Wireguard VPN server (among other things) for a set of 4 VPS servers I have running in the cloud. Environment. 1 Release Notes state the following: - wireguard: installed by default using the bundled FreeBSD 13. 2 (and 14) replacement kernel for OpnSense. @strongthany you posted your firewall rules but the WireGuard config on the OPNsense would be much more interesting and probably relevant. Set the MTU and MSS values to 1420 (!Important!) Save and Apply changes. 2/32 PrivateKey = XXX DNS = 1. MTU - 1412; DNS servers - enter the WireGuard regular DNS server IP address (172. Hey all, very new to OPNSense and love it so far I Struggled for the last 2 days trying to get Wireguard to connect, but finally succeeded! This post is hopefully for those other new users like me googling for help in the early morning hours (Can't reboot the firewall while the family is Wireguard RW setup - Handshake not completed. On both WG 1412 is set as MTU. This is more an organisational aesthetic, rather than an issue of substance (default) or 1352 if you use PPPoE; it's 60 bytes less than your Wireguard MTU. ansibleguy. There should be an option to set the WireGuard Interface's MTU. The first thing that pops out is that you haven't configured your Wireguard correctly so anything else is pointless until you fix this. I follow Christian McDonald's YouTube videos for setup. But I do not use mullvsd, try his videos s4rs; Full Member; Author Topic: Wireguard in opnsense (Read 96777 times) abalsam. 8. I could ssh into various servers on my network but my browser would not load any pages provided by internal services (OPNSense, Unifi, Plex, etc). The WireGuard interface checks Hello fellow travelers, I’ve been delving into the MSS/MTU issue and made some headway. com; <<>> DiG 9. Last thing we need to set up is maximum MSS for TCP packets, which is 40 bytes smaller than the MTU of WireGuard. 7, the upgrade went smooth. The OPNsense business edition transitions to this 23. For me MTU = 1392 Quote from: Patrick M. Cloudflare's speed test shows a 20ms latency. 0/24 and the 4 servers are in 192. 3. 2, PHP 8. 0/0 A WireGuard interface for this tunnel has also been created with default values. In the pre 24. If you use windows with the Wireguard client, try to change the MTU of your main network interface to something like 1400 or 1380 or lower and I've been searching thru the threads regarding slow wireguard performance on opnsense I'm hoping someone is able to provide some clarity as to what is causing my wireguard to max out at about 383Mbits/Sec Did you set a smaller MTU than 1420, especially if you go over IPv6 and / or PPPoE and /or VLAN? Intel N100, 4 x I226-V, 16 GByte, 256 The WireGuard tunnel is already setup and working (handshakes are seen in the UI). After that, the tunnel comes back up properly but it looks like the Wireguard on Opnsense has 10. dns_servers. First off, I understand that I might be doing this all wrong but I've tried to get myself as far as I can before asking for help. You will connect Site A LAN Net 172. 5. ping -f <IP of Device on other end of VPN> -l <MTU to test> ping -f Set-up a Wireguard S2S VPN and got the two nodes pinging each other across the tunnel subnet Unfortunately I couldn't find any guides in setting up VXLAN on OPNsense so I'm mostly working from Linux HOWTOs that describe how this should be architected and trying to map it to OPNsense. This HOWTO describes how to connect to AirVPN with a Wireguard VPN tunnel from OPNsense. However I found it was impossible to change the MTU on the WG interface. list. Leave everything in the rule on any (its the I have tried setting the interface and the Wireguard Local MTU to 1420 (the usual default) and then no traffiic passes. It's worked great. A. 136. I have disable routes checked for all of my tunnels N. After setting MTU 1300 on both sides: opnSense: wg1: flags=80c1<UP,RUNNING,NOARP,MULTICAST> metric 0 mtu 1300 ServerB: 6: wg0: <POINTOPOINT,NOARP,UP,LOWER_UP> mtu 1300 qdisc noqueue state UNKNOWN group default qlen 1000 OPNsense 24. 0-4 host with virtio network cards. done OPNsense repository update completed. it looks like the handshake is successful but I can't ping anything or resolve DNS. OPNsense is an OSS project Setup is "Site DZ" with virtual OPNsense and "Site O" with a hardware firewall with OPNsense, both running latest Business Firmware. MTU 1420 IPv4 address xxx. Also, we need to allow each router to be able to access the other using the other’s WireGuard address — as well as the OSPF multicast addresses — so at minimum we would need to adjust the AllowedIPs setting for each to include I had set up a functional wireguard config in a "road warrior" scenario. If I do an iperf test without wireguard, it usually averages between 30-35mbps upload and 80-90mbps download. As soon as i enable wireguard, connection speed drops to 1-2mbps in upload and download, no matter where the traffic comes from (LTE, public hotspots, my wg0: flags=43<UP,BROADCAST,RUNNING> metric 0 mtu 1420 options=80000<LINKSTATE> inet 10. 30GHz (20 cores, 40 threads). I'm using the same hardware that I used with PFsense - i5 8250u with 8gb ram. ip link set mtu 1420 up dev wg0 interface: wg0 public key: publickey private key: (hidden) listening port I'm trying to setup an OPNSense Wireguard VPN with selective routing using a VPS (Hetzner) as an exit node. 2/32 I have Opnsense router connected to Charter internet modem. I can route through LAN to outside (using allowed IP of 0. false-dns. Since VXLAN is not encrypted, a VPN should be used to secure the connection. boolean. The OPNsense router has 3 lan Ethernet ports, each for a different lanX subnet exiting to a gateway that is a wgX tunnel. Have here wireguard up and running between 2x OPNsense. 0/0, ::/0 Endpoint = *:51830 PersistentKeepalive = 25 PublicKey = * Re: WireGuard not working ipv4 after update to opnsense 24. Yes MTU setting is just out of desperation, this should by all means be the easiest VPN to setup up, hence makes no sense not working or pingign either the VPN peer or any subnet behind Whilst doing that, the OpnSense VM had ~80% load, whereas the pfSense VM only had 40%. That solved it for me I'm currently investigating further If the allowed IPs in Wireguard allow access to any of these IP addresses, and the Wireguard Firewall rules allow the connection, then it will establish to Caddy. Looks like the typical MTU problem. i my opinion the real challange is to set the MTU in an right size. false. Configure & Enable WireGuard; Assign the WireGuard interface; Tweak WireGuard Gateway Still no joy here Access is almost perfect; I can ping LAN hosts, and load web pages from them via IP. Needs to be 80 bytes shorter than normal MTU. Shame as I wanted to use Wireguard, but at least I'm closer to solving it properly now. 0/24 . Reverting to 10. Question: Do my WireGuard issues seem to be Hardware related or should I explore configuring OPNSense further (I've found guide that have tips for modifying tunables, but they haven't helped). In my case though, my provider tunnels my IPv4 over IPv6 to save v4 Addresses (DSLite). 1 OPNsense offers a wide range of VPN technologies ranging from modern SSL VPNs to well known IPsec as well as WireGuard and Zerotier via the use of plugins. Once there, you should be able to see the window below: tun-mtu 1500; tun-mtu-extra 32; mssfix 1450; persist-key; persist-tun; reneg-sec 0; remote-cert-tls server; Verbosity level: 3 (recommended) 6. For more than 9 years now, OPNsense is driving innovation through modularising and hardening the open source firewall, with simple and reliable firmware upgrades, multi-language support, fast adoption of upstream software updates as well as clear and stable 2-Clause BSD licensing. Default 1420. so all of this interfaces have an different MTU value. When there is 0 packet loss, there is no issue. # // +--> The network area of the OPNsense WireGuard VPNs # // | # // +--> Network behind the firewall AllowedIPs = 0. 168. I got Wireguard running and have been noticing that the latency in some realtime applications like Zoom is significant. OpnSense 21. After a bit more searching MTU was the culprit. Obviously it's a hassle since it means changing the MTU on all devices on the LAN etc. On my my APU4 PCEngine with opnsense I get max 120Mbps. So, as you send and receive data over the connection, if a datagram exceeds 1420 bytes, it will be fragmented, which can break the connection. 7 Legacy Series » Wireguard . DNS Server. On the LAN side I have all of my personal network on the `192. If it is hardware, what would be a good suggestion for a replacement? Atm in Tenerife on holiday so dont have much of an acces to my opnsense (can VPN it but the 3/5g and wifi are really bad in this area) Yes, I do have 2 Surfshark VPNs open at the same time and redirect traffic to one or another depending on source/target/port and it does all work. com;; global options: +cmd I'd guess it's something MTU/MSS related. VPN - Wireguard - Satus - Handshake is empty. The Proxmox in the datacenter is on an Core i5-13500 and I use "host" CPU type to enable AES-NI with 4 cores assigned. Although, when I try and stream certain videos (iptv) I get really bad buffering. Save the rule. Something changed when Wireguard moved into the kernel in v23. The wireguard tunnel is configured just fine. so i'm also intrested in this challamge. Version: 0. 0/24 to Site B LAN Net 192. 6 APU 4D4 (GX-412TC CPU; 4 Nics i211AT ) The text was updated Login to OPNsense GUI and navigate to VPN -> WireGuard -> Instances -> Add new (+ sign) Fill in the details from the [Interface] section of the config file that was downloaded. 0/1 -interface wg0; Now you have everything you need. (Without this you may have issues loading websites or slow speeds). Thanks to https: <POINTOPINT,NOARP,UP,LOWER_UP> mtu 1420 qdisc noqueue state UNKNOWN group default qlen 1000 link /none inet 10. Hausen on August 05, 2024, 07:08:30 AM Of course you need to have a working WG server running - on your OPNsense! - to use the app for the Mac. Add the WireGuard network to the unbound DNS Access Lists. 0/24 using the Wireguard Transfer Net 10. 0. x release will work with the built in kernel, otherwise mmmm MTU seems awful high. I have managed to configure the wireguard tunnel successfully and there is traffic between the local and remote network. x: ICMP 8. 'Laptop' is a peer of the only wireguard instance (and is enabled). conf) add in the [Network] section the following instruction: MTU = 1280 This directive will tell WireGuard to use a tunnel MTU of 1280 bytes (it's the minimum size, smaller size will not be accepted), which normally will never exceed the physical link MTU size. 5, id 0, off 0, len 64, interface wg1, mtu 1420: Network is unreachable The WG links are up, set up as gateways with monitored pings. Also, the Wireguard ICMP frag-needed packet could only be seen on wg0, never on em1. 10 Series . Neither worked. One can set the tunnel MTU manually. 1/24 MTU = 1420 SaveConfig = true PostUp = iptables -A FORWARD -i wg0 -j ACCEPT; iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE; ip6tables -A FORWARD -i wg0 -j ACCEPT; ip6tables -t nat -A I would like connected clients to be forced to use the UnBound DNS service running on OPNSense. AdSchellevis transferred this issue from opnsense/core May 5, 2019. I moved it from the default 1420 to 1380 and everything seems to load as expected. But this is not an OPNsense problem. Ping is 37ms over When i configure wireguard and look at the wg0 interface using ifconfig i see a MTU of 1420 (1500 - 80 for the Wireguard header). I'm writing this guide first as a reference for Say we have IPv4 only peers, the number is now 1480, then we take off the UDP and wireguard encapsulation which together is 40 bytes. If you are using IPv6 between the Wireguard peers for the clearnet link, you need to reduce that 1420 MTU on the Wireguard interface on both peers by one for every byte less then 1500 that MTU is. couple of weeks i've strugeling on getting wireguard configured and working, today i am going to explain how to do with screenshots. Step 1, Go to plugin and install wireguard Step 2 go to VPN >> Wireguard >>> and Enable it Step 3 Go to VPN WireGuard Local, and create a Local connection. When small packet loss is seen, it seems to affect WG stability exponentially. g. Hi, I'm a bit clueless right now, because my opnsense wireguard server is not performing as expected. pkg: . ---## OPNSense configuration Allright, we have what we need to get things going regards to configuring our OPNsense firewall. By default Wireguard By default i believe GIF interfaces on OPNsense are 1280mtu, but you can go to your Tunnel interface and set the MTU of that assigned interface to 1480 (if you have a WAN MTU of 1500, otherwise WAN MTU - 20 = Tunnel MTU). If automatically created routes should be disabled. These 4 servers connect with a Wireguard client to my OPNSense server, so I can extend them into my home network. Afterwards ifconfig shows that the wg0 interface respects the setting. Any thoughts on what's going on and how After switching temporarily to static routing and some hours of debugging I was able to trace down the problem to the MTU logic used in wireguard. Wireguard - very slow speeds; User actions Print. Navigate to System > Trust > Authorities and click on the +Add button. 1 Date WireGuard on OpnSense. NAT outbound rule for the WireGuard network. Goto Firewall: Settings: Normalization 1. Just create a rule for "Interface: Wireguard (Group). done Processing entries: . Is there any other way of solving this without changing the MTU of each client device / VM that is using the VPN For each one there is a roadwarrior (wireguard) setup which is instance 1. md. 0/24 (192. 4 <<>> google. I can run MTU 1500 on my equipment on the WAN interfaces and I have MTU 1400 on my Wireguard instances. However when i use wireguard on the opnsense box (HP T720) then my speeds drop down to 250-280Mbps. Tunnel address Hi, I've been going through the process of trying to setup a wireguard tunnel so I can access my local network resources from outside my network, i've been trying to use wireguard for this. 7. 123. starting from an PPPoE connection over the wireguard tunnel throught the VXLAN. The peer has allowed ips of the tunnel and not 0. 5 « Reply #44 on: September 28, 2024, 04:44:38 pm » I added the attached outbound rule, after reboot I still had to hit "apply" on the gateway page for iphone with wireguard to get I've been running OPNSense successfully for a few years and Wireguard on it for a year or two. wg. I have a very basic configuration and I'm just not seeing the remote OPNsense fw trying to initiate the connection :(Remote wireguard clients on windows/macos can all connect just fine, so I know the central fw is listening and functional. 1 ifconfig wg0 mtu 1420 [#] ifconfig wg0 up [#] route -q -n add -inet 10. 9 so some of the fields may be in Wireguard instance and interface to 1456+28-8-60 For my second WAN the MTU is much lower, 1352, after pinging (it's a 5G connection), it's currently set: Physical interface to 1352+28 Wireguard tunnel to 1352+28-60 I have also set normalisation for each wireguard interface with an MSS of 1456+28-8-60-40 for WAN1 and 1352+28-60 On wireguard interface the MTU was set to 1420 which would be acceptable on an 1500 wan interface setup. 9 to 20. is there an real knowing hacker out there that can calc all this values From the OpnSense I can ping both peers on MAD and SP, on reverse direction from SP I can reach to the peer set on OpnSense as well, so in terms of connection between the Wireguard it seems to be working, my o wireguard: pass endpoint to validator to avoid invalid QR code errors on mobile app o wireguard: add MTU when set on the instance o backend: allow to query multiple sysctl queries at once o mvc: pass isFieldChanged() to children in ContainerField o mvc: replace \Phalcon\Filter\Validation\Exception with \OPNsense\Base\ValidationException wrapper Thanks for all your help in setting up Opnsense. Whether this difference is due to OpenVPN vs. Saving the configuration, installing version 21. the log messages in Live View is green). conf in the interface stanza. If I enable one enpoint with only the 10. 6 APU 4D4 (GX-412TC CPU; 4 Nics i211AT ) The text was updated Not setting the MTU to 1412 or 1420 will not prevent a Wireguard connection, but will cause many lost packets and severe performance degradation. If i look at the MTU of the wg0 interface i think the default value (1420) is not correct as it does not account for the 8 bytes of the PPPoE header (only 80 bytes for Wireguard). Both server WAN is 1500. On a tunnel you are limited by the endpoint MTU. EDIT: Also it might be just better to use the unbuilt wireguard server in the OPNsense so you don't have routing Problems. Otherwise they all need to be configured on the default WireGuard group that OPNsense creates. This leads to me having a lower than usual MTU, which i need to account for in my wireguard. Same phenomenon: IPsec disabled, WireGuard is working with WireGuard has a maximum transmission unit (MTU) of 1420. Based on? Experience Try to assign WG interface and set mss to OPNsense + ProtonVPN + Wireguard Configuration Guide - proton_opn_wg. WG defaults to 1420 which is valid if your WAN has an MTU of 1500 Bytes (e. I'm setting up a WireGuard VPN on OPNsense and aiming for full-tunnel functionality. 23. Access rule on the WireGuard interface from the WireGuard network to any. 1420-Integer between 1 and 9300. which the wireguard interface accounts for by setting a lower MTU than the default 1500 in the default config. It seems the MTU is too low on wireguard and the ICMP information to your client sending to huge packets get's lost I am using the most recent OPNSense image, and have everything updated. It's not related to MTU (1412 Networking is love. VPN - Wireguard - Logfile is empty. 0-STABLE OpenSSL 1. The only issue I am seeing is with the wireguard vpn. Both PC are under Windows 10, the client use Wireguard client for connect while Opnsense is the VPN server It seems normal to you? if not what must i check? Best Regards « Last Edit: March 20, 2023, Some more or less MTU did not make a real difference for me, therefore 1420 may also be fine, as I cannot exclude performance issues on host Opnsense Setup LAN Interface MTU = 1420 WG Interface MTU & MSS = 1420 Have the same issue, if i bypass the opnsense and use wireguard on my macbook i get about 800Mbps to 900, close to 1Gigabit. Speed is great, I'd say saturates around 85% of my base speed (939mbps). Regular pings work. I am using same config that I used in PFSense that worked and have even followed numerous websites on OPNSense wireguard setup but nothing works. 1 - Disable routes: Yes[/li][/list] WireGuard Peer Configuration FW2: OPNsense Forum » English Forums » Virtual private networks » WireGuard S2S: Return Traffic Uses WAN Instead of Tunnel for Port-Forwarded Traf Welcome to OPNsense Forum. 844 packages processed. R. The first thing you need to do to fix your OpenVPN MTU problem is to figure out what your largest MTU actually is. 10 release including numerous MVC/API conversions, the new OpenVPN “instances” configuration option, OpenVPN group alias support, deferred authentication for OpenVPN, FreeBSD 13. 0 I have played with MTU settings in OpnSense, first by introducing an MTU of 1400 then 1000. I want it to be higher but for now i'm just happy it works. 0/24). But as expected, I can not In the WireGuard profile (. OPNsense; WireGuard PIA; WireGuard Private Internet Access . 1/24 Wireguard status shows Windows machine says peer: XXX(public key) allowed ips: 10. Hello, I skimmed through your post because it is super long and does not include quite a few details. Then it should work imho. It will create Wireguard Instance(Local) and Peer(Endpoint) on your OPNsense setup. " C. ) OPNsense 24. Insert the The UI for configuring the Instances and Peers changed with OPNsense verion 23. I've gone through the OPNSense Wireguard documentation and double checked interface names, NAT rules, IP address formatting, DNS Access Control Lists, etc, and I'm just not seeing where I've gone wrong. 0 underneath OpnSense. Tip. 2/32 on Endpoint allowed IPs. Wireguard in opnsense - Page 9 WireGuard Instance Configuration FW2: - MTU: 1412 - Tunnel address: 10. You signed in with another tab or window. 8 unreachable - need to frag (mtu 1420), length 36 Public VM(Server1), Opnsense last version, 400/400 internet connection, Wireguard kmod, NAT from wireguard to WAN. 2/16 scope global nordlynx valid_lft forever preferred_lft forever Allright. Cable connection). tcpdump from opnsense on the wireguard interface showed: 19:39:01. To rule out any virtio shenanigans, I also tried passing the onboard NICs to the OPNsense VM, which did not result in any different behavior. Therefore, I would like to check with a pure FreeBSD 13. Trouble with Wireguard on OPNSense Ok, so I was following the selective routing guide for Wireguard. Discuss VPN related matters, including OpenVPN, IPsec, Wireguard, . Issues: When I set 0. backend: allow In the Wireguard example I posted above, note the complete absence of the IP address of the client on the LAN. I want to implement WireGuard in a site to site configuration and since I'm learning, I've decided to put it into OpnSense first. 0/0 #Endpoint = <Public IP of the BTW, MTU 1420 isn't surprising since wg has a protocol overhead of nearly 80 bytes worst case, so most ppl would just configure 1420, especially considering DSL PPPoE MTU of 1492 If I disable all endpoints in OPNsense, wireguard starts. Log in; Sign up " Unread Posts Updated Topics. But DSL over PPPoE has 1492 which makes it 1412 for wg when tunnel is established via IPv6. Private key is the one you generated earlier. [Interface] Address = 172. (I. BTW: I did check now with FreeBSD 13. Newbie; Posts: 23; Karma: 0; Re: Wireguard in opnsense « Reply #45 on: September 09, 2018, 08:05:14 pm ifconfig wg0 mtu 1420; ifconfig wg0 up; route -q -n add -inet 0. This is wrong in case of a PPPoE connection as PPPoE adds The default MTU is 1420 for wireguard. Wireguard has overhead of 60 Bytes (IPv4) or 80 Bytes (IPv6) That's what you have to substract from regular Interface. So I set the box up leaving almost everything at the default settings. My goal is for remote clients to: Browse the internet using the home office public IP. xxx. IPsec Since IPsec is used in many different scenario’s and sometimes I've been testing my wireguard setup by tethering my laptop to my phone's (Pixel 7) hotspot (Google Fi). To Server1 I have connected client (Server2-public VM-Ubuntu) via Wireguard to access internet only via wireguard tunnel (0. 10. Or 1380 for 1420 tun-mtu 1500; tun-mtu-extra 32; mssfix 1450; persist-key; persist-tun; reneg-sec 0; remote-cert-tls server; Step 4 In Opnsense interface go to Interfaces -> Assignment -> Add Interface ovpnc1 (in my case) to the interfaces and give it a name (in my case is simply Surfshark) Once the interface is created: IPv4 Configuration Type : None Step 4. There could be really a MTU overhead due to headers, cell networks can be wacky as I described. Go to opnsense r/opnsense. 137. 3 as well as with FreeBSD 14. Access LAN devices (192. On your wireguard server you have to add 10. lfdwwk qsip yfxs ltteddk qbnoeafw npd shc xxgjk omdjbd avoitnf