From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id CD049C433EF for ; Tue, 21 Sep 2021 04:29:34 +0000 (UTC) Received: from lists.zx2c4.com (lists.zx2c4.com [165.227.139.114]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id CFC3F60F9E for ; Tue, 21 Sep 2021 04:29:33 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org CFC3F60F9E Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=gmail.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=lists.zx2c4.com Received: by lists.zx2c4.com (ZX2C4 Mail Server) with ESMTP id a9246d5c; Tue, 21 Sep 2021 04:27:21 +0000 (UTC) Received: from mail-lf1-x129.google.com (mail-lf1-x129.google.com [2a00:1450:4864:20::129]) by lists.zx2c4.com (ZX2C4 Mail Server) with ESMTPS id c8a7c3ad (TLSv1.3:AEAD-AES256-GCM-SHA384:256:NO) for ; Tue, 21 Sep 2021 04:27:17 +0000 (UTC) Received: by mail-lf1-x129.google.com with SMTP id i4so76849561lfv.4 for ; Mon, 20 Sep 2021 21:27:17 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :content-transfer-encoding; bh=Nf5uUj2b3BET0rjohtGuWhYL+bT5v353dhaRdLgMTD0=; b=nJztssjTz+R7WaDV4GZ/TIy1CLC98TGzDcSNLLuV1ti5tC107jXp4CPPAeJ0FTVC13 ZtyroVRqRPW6Zd4/YHrvXaBjatcOnnM3jfH7PU9l0FDrzIhJmxO0+p9dwFc0HjXeMp3b OkeGJ/uJC/ts2+0Ijbx+kdzckbuXIMqGLM8PPkOqPQ+0wAuhk+EJTQGGVBQ3r0G+DK5j yKO8IeaztZbj3pg6wVtEqbPtYnQfYp/D0snWSuXdlxWm5H+2RsQyIbHvdZoqmd8nVRlL Ut1HTysqC7Ay3k1E4/F2Ptg/rD3i+vtthIdirHgVA23eWys/38359BCHPlBx5QlJmyTk LkNA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:content-transfer-encoding; bh=Nf5uUj2b3BET0rjohtGuWhYL+bT5v353dhaRdLgMTD0=; b=1/pWwX+av9Go0QIiCkhS5dyn44TPoE3Y4WmOqFhsVAR2iUyEmkNNkzj5Z94Tsk22V4 lpPpRQxOp551N2tlbFvRq1ueZxzjBKQARGnp/Q2FJwxuu6evDfKYWNPO22TJkqhg+UYa cTK1X9y9is9/W1Bd7XMfZa4ofJ6LZ9UiMtIRowvjjBHcwnUJ+Ex5gqrrjg2ugrPVvvfR WLzV9Jk7ITxKm/tuBAsBgH/prej0dvCCGkutzf8JFxnPb1/GPVwZWLj5i0zCutr0qx7N 4uDN0MFrKOoW6NDP8krP7Nn0/Bi1gAWedg5MMRAuCkcPVLqUy70nDZ/sMOkvwKGSodCz eTLw== X-Gm-Message-State: AOAM530ZCknoGzDV6el9a+QgYN8jStcBxD8Wm49g/MjNFf0CXZ/dbtvF TOHjrVyWXBBTb6+iS6QGX1QdXV7xuW1mOAQGoaefEcVsMuA24g== X-Google-Smtp-Source: ABdhPJx7FEb4MBn9H1HO5hXodkHvgESBE2XNIX+4uMOxBA1E6Ld+Z5/kO+T5cJzYinzLohuFuD1fUcpFNaXomqxsc4o= X-Received: by 2002:a05:6512:22c9:: with SMTP id g9mr20453813lfu.637.1632198435964; Mon, 20 Sep 2021 21:27:15 -0700 (PDT) MIME-Version: 1.0 References: In-Reply-To: From: =?UTF-8?B?2K3Yp9mF2K8g2LXYp9io2LE=?= Date: Tue, 21 Sep 2021 08:56:59 +0430 Message-ID: Subject: =?UTF-8?Q?Re=3A_Unexpected_experience_of_site=2Dto=2Dsite_wireguard_?= =?UTF-8?Q?tunneling=E2=80=8F=E2=80=8F?= To: WireGuard mailing list Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-BeenThere: wireguard@lists.zx2c4.com X-Mailman-Version: 2.1.30rc1 Precedence: list List-Id: Development discussion of WireGuard List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: wireguard-bounces@lists.zx2c4.com Sender: "WireGuard" Dear all, I have been struggling with this issue for many days but can't even guess the cause. John did me a favor and connected to my server to check what's going on, but he couldn't find it either. May someone please suggest an idea. I doubt there is a Wireguard bug. Rgds Hamed =E2=80=AB=D8=AD=D8=A7=D9=85=D8=AF =D8=B5=D8=A7=D8=A8=D8=B1 <=E2=80=AAhsaber= @gmail.com=E2=80=AC=E2=80=8F> =D8=AF=D8=B1 =D8=AA=D8=A7=D8=B1=DB=8C=D8=AE = =D8=B4=D9=86=D8=A8=D9=87 =DB=B4 =D8=B3=D9=BE=D8=AA=D8=A7=D9=85=D8=A8=D8=B1 = =DB=B2=DB=B0=DB=B2=DB=B1 =D8=B3=D8=A7=D8=B9=D8=AA =DB=B2=DB=B1:=DB=B2=DB=B5= =D9=86=D9=88=D8=B4=D8=AA:=E2=80=AC > > UPDATE: > During the outage, I ran a simple test to check if both sides have > access to each other's specified UDP ports, then I found something > interesting: > Some 148 bytes length packets are transferred between parties which I > can't recognize what are them. > By the way here I copy my test results. > Anybody can spot what's going on here? > The middle-node host name which runs wg1 is ir-pp and the exit-note > (to free internet) which runs wg2 is sf-do: > (these two parts happened at the same time and are copied from 2 > different servers): > > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D > root@ir-pp:~# nc -u sf-do 50840 > 123456 > 1234 > 12 > ^C > root@ir-pp:~# tcpdump 'port 50841' > dropped privs to tcpdump > tcpdump: verbose output suppressed, use -v or -vv for full protocol decod= e > listening on eth0, link-type EN10MB (Ethernet), capture size 262144 bytes > 20:56:57.607342 IP ir-pp.50841 > sf-do.50840: UDP, length 148 > 20:57:01.042471 IP sf-do.43161 > ir-pp.50841: UDP, length 3 > 20:57:02.361827 IP ir-pp.50841 > sf-do.50840: UDP, length 148 > 20:57:03.635754 IP sf-do.43161 > ir-pp.50841: UDP, length 5 > 20:57:06.740922 IP sf-do.43161 > ir-pp.50841: UDP, length 7 > 20:57:07.552305 IP ir-pp.50841 > sf-do.50840: UDP, length 148 > ^C > 6 packets captured > 15 packets received by filter > 0 packets dropped by kernel > root@ir-pp:~# > > > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D > root@sf-do:~# tcpdump 'port 50840' > dropped privs to tcpdump > tcpdump: verbose output suppressed, use -v or -vv for full protocol decod= e > listening on eth0, link-type EN10MB (Ethernet), capture size 262144 bytes > 20:56:09.126958 IP sf-do.50840 > ir-pp.50841: UDP, length 148 > 20:56:14.758974 IP sf-do.50840 > ir-pp.50841: UDP, length 148 > 20:56:18.222814 IP ir-pp.38136 > sf-do.50840: UDP, length 7 > 20:56:20.391041 IP sf-do.50840 > ir-pp.50841: UDP, length 148 > 20:56:22.307488 IP ir-pp.38136 > sf-do.50840: UDP, length 5 > 20:56:24.702590 IP ir-pp.38136 > sf-do.50840: UDP, length 3 > 20:56:25.510985 IP sf-do.50840 > ir-pp.50841: UDP, length 148 > 20:56:30.630917 IP sf-do.50840 > ir-pp.50841: UDP, length 148 > 20:56:35.750965 IP sf-do.50840 > ir-pp.50841: UDP, length 148 > ^C > 9 packets captured > 9 packets received by filter > 0 packets dropped by kernel > root@sf-do:~# nc -u ir-pp 50841 > 12 > 1234 > 123456 > ^C > root@sf-do:~# > > =E2=80=AB=D8=AD=D8=A7=D9=85=D8=AF =D8=B5=D8=A7=D8=A8=D8=B1 <=E2=80=AAhsab= er@gmail.com=E2=80=AC=E2=80=8F> =D8=AF=D8=B1 =D8=AA=D8=A7=D8=B1=DB=8C=D8=AE= =D8=AC=D9=85=D8=B9=D9=87 =DB=B3 =D8=B3=D9=BE=D8=AA=D8=A7=D9=85=D8=A8=D8=B1= =DB=B2=DB=B0=DB=B2=DB=B1 =D8=B3=D8=A7=D8=B9=D8=AA =DB=B8:=DB=B3=DB=B9 =D9= =86=D9=88=D8=B4=D8=AA:=E2=80=AC > > > > Hi again, > > Something new happened which makes me more confused. > > I wrote a small shell-script to check the connection between wg1 and > > wg2, so whenever it drops, the script restarts the wg1 and everything > > comes back. > > Yes yes I don't like this way of addressing issues, but what could I > > do if no meaningful debug information exists, and I predict that it > > might be a bug of Wireguard itself? > > BTW this system worked fine and the anti-censorship VPN chain was up > > and running till this morning. > > The connection went down at 7:49 and didn't come back with > > auto-restart. The process of restarting continued for about 6 minutes, > > and at last at 7:55 it came back. > > During the outage I checked both sides and everything seemed fine. > > Sides could ping the public ip of each other, their wg udp ports were > > accessible to each other, and even handshake seemed to be finished > > correctly (using wg-show command) but peers couldn't ping each other. > > And the most confusing part is everything came back to life without > > any action from my side. Just after 6 minutes of continuously > > restarting the wg1 interface! > > Isn't there a bug? Somebody please help me to debug this problem and > > find the cause. > > > > Here I bring you my shell-script code, and then its related log: > > > > ------------------------- > > #!/bin/bash > > > > exec >>/var/log/wg-ping 2>&1 > > while true > > do > > connection=3D$(ping -c 1 10.10.10.1) > > time=3D$(date +%H:%M) > > seconds=3D$(date +%S) > > seconds=3D${seconds#0} > > if [[ "$connection" !=3D *"icmp"* ]]; then > > echo " " > > date > > wg-quick down wg1 > > echo " " > > wg-quick up wg1 > > connection=3D$(ping -c 1 10.10.10.1) > > time=3D$(date +%T) > > if [[ "$connection" !=3D *"icmp"* ]]; then > > echo "$time ERROR" > > else > > echo "$time OK" > > echo " " > > fi > > elif [[ $seconds -lt 5 ]]; then > > echo "$time OK" > > fi > > sleep 5 > > done > > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D > > Sample log of simply restarting the wg1 which makes everything fine > > (and happens every few hours): > > ----------------------- > > 01:17 OK > > 01:18 OK > > 01:19 OK > > 01:20 OK > > 01:21 OK > > 01:22 OK > > 01:23 OK > > 01:24 OK > > 01:25 OK > > 01:26 OK > > > > Fri Sep 3 01:26:41 +0430 2021 > > [#] ip route del default dev wg1 table middle > > [#] ip rule del iif wg0 lookup middle > > [#] ip link delete dev wg1 > > > > [#] ip link add wg1 type wireguard > > [#] wg setconf wg1 /dev/fd/63 > > [#] ip -4 address add 10.10.10.2/32 dev wg1 > > [#] ip link set mtu 1420 up dev wg1 > > [#] ip -4 route add 10.10.10.1/32 dev wg1 > > [#] ip route add default dev wg1 table middle > > [#] ip rule add iif wg0 lookup middle > > [#] wg set wg1 peer allowed-ips 0.0.0.0/0 > > 01:26:42 OK > > > > 01:27 OK > > 01:28 OK > > 01:30 OK > > 01:31 OK > > 01:32 OK > > 01:33 OK > > 01:34 OK > > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D > > And the log for the confusing situation I explained: > > ----------------------- > > 07:45 OK > > 07:46 OK > > 07:47 OK > > 07:48 OK > > 07:49 OK > > > > Fri Sep 3 07:49:42 +0430 2021 > > [#] ip route del default dev wg1 table middle > > [#] ip rule del iif wg0 lookup middle > > [#] ip link delete dev wg1 > > > > [#] ip link add wg1 type wireguard > > [#] wg setconf wg1 /dev/fd/63 > > [#] ip -4 address add 10.10.10.2/32 dev wg1 > > [#] ip link set mtu 1420 up dev wg1 > > [#] ip -4 route add 10.10.10.1/32 dev wg1 > > [#] ip route add default dev wg1 table middle > > [#] ip rule add iif wg0 lookup middle > > [#] wg set wg1 peer allowed-ips 0.0.0.0/0 > > 07:49:53 ERROR > > > > Fri Sep 3 07:50:08 +0430 2021 > > [#] ip route del default dev wg1 table middle > > [#] ip rule del iif wg0 lookup middle > > [#] ip link delete dev wg1 > > > > [#] ip link add wg1 type wireguard > > [#] wg setconf wg1 /dev/fd/63 > > [#] ip -4 address add 10.10.10.2/32 dev wg1 > > [#] ip link set mtu 1420 up dev wg1 > > [#] ip -4 route add 10.10.10.1/32 dev wg1 > > [#] ip route add default dev wg1 table middle > > [#] ip rule add iif wg0 lookup middle > > [#] wg set wg1 peer allowed-ips 0.0.0.0/0 > > 07:50:18 ERROR > > > > =3D=3D=3D=3D=3D=3D > > LOTS OF RETRY LOGS CROPPED > > =3D=3D=3D=3D=3D=3D > > > > Fri Sep 3 07:55:13 +0430 2021 > > [#] ip route del default dev wg1 table middle > > [#] ip rule del iif wg0 lookup middle > > [#] ip link delete dev wg1 > > > > [#] ip link add wg1 type wireguard > > [#] wg setconf wg1 /dev/fd/63 > > [#] ip -4 address add 10.10.10.2/32 dev wg1 > > [#] ip link set mtu 1420 up dev wg1 > > [#] ip -4 route add 10.10.10.1/32 dev wg1 > > [#] ip route add default dev wg1 table middle > > [#] ip rule add iif wg0 lookup middle > > [#] wg set wg1 peer allowed-ips 0.0.0.0/0 > > 07:55:23 ERROR > > > > Fri Sep 3 07:55:38 +0430 2021 > > [#] ip route del default dev wg1 table middle > > [#] ip rule del iif wg0 lookup middle > > [#] ip link delete dev wg1 > > > > [#] ip link add wg1 type wireguard > > [#] wg setconf wg1 /dev/fd/63 > > [#] ip -4 address add 10.10.10.2/32 dev wg1 > > [#] ip link set mtu 1420 up dev wg1 > > [#] ip -4 route add 10.10.10.1/32 dev wg1 > > [#] ip route add default dev wg1 table middle > > [#] ip rule add iif wg0 lookup middle > > [#] wg set wg1 peer allowed-ips 0.0.0.0/0 > > 07:55:39 OK > > > > 07:56 OK > > 07:57 OK > > 07:58 OK > > 07:59 OK > > 08:00 OK > > --------------------------------------- > > > > > > > > =E2=80=AB=D8=AD=D8=A7=D9=85=D8=AF =D8=B5=D8=A7=D8=A8=D8=B1 <=E2=80=AAhs= aber@gmail.com=E2=80=AC=E2=80=8F> =D8=AF=D8=B1 =D8=AA=D8=A7=D8=B1=DB=8C=D8= =AE =D9=BE=D9=86=D8=AC=D8=B4=D9=86=D8=A8=D9=87 =DB=B2 =D8=B3=D9=BE=D8=AA=D8= =A7=D9=85=D8=A8=D8=B1 =DB=B2=DB=B0=DB=B2=DB=B1 =D8=B3=D8=A7=D8=B9=D8=AA > > =DB=B8:=DB=B4=DB=B7 =D9=86=D9=88=D8=B4=D8=AA:=E2=80=AC > > > > > > -Thanks for reply. > > > For test reasons, I turned the firewall off on my middle-node server. > > > But I can't understand how this issue may be related to firewall, > > > because most of the time it works (and to me it means firewall is Ok)= , > > > but sometime for some unknown reason it stops working, which when I > > > restart the wg1 interface with this command everything comes back to > > > life: > > > wg-quick down wg1 && wg-quick up wg1 > > > > > > BTW here it is the firewall status of middle-node: > > > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D > > > =E2=97=8F firewalld.service - firewalld - dynamic firewall daemon > > > Loaded: loaded (/usr/lib/systemd/system/firewalld.service; > > > disabled; vendor preset: enabled) > > > Active: inactive (dead) > > > Docs: man:firewalld(1) > > > ----------------------------------- > > > Chain INPUT (policy ACCEPT) > > > target prot opt source destination > > > > > > Chain FORWARD (policy ACCEPT) > > > target prot opt source destination > > > > > > Chain OUTPUT (policy ACCEPT) > > > target prot opt source destination > > > ----------------------------------- > > > > > > And the firewall status of exit-node: > > > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D > > > Unit firewalld.service could not be found. > > > --------------------------- > > > Chain INPUT (policy ACCEPT) > > > target prot opt source destination > > > ACCEPT udp -- 0.0.0.0/0 0.0.0.0/0 udp dpt= :50842 > > > ACCEPT udp -- 0.0.0.0/0 0.0.0.0/0 udp dpt= :53 > > > > > > Chain FORWARD (policy ACCEPT) > > > target prot opt source destination > > > ACCEPT all -- 0.0.0.0/0 0.0.0.0/0 > > > ACCEPT all -- 0.0.0.0/0 0.0.0.0/0 > > > > > > Chain OUTPUT (policy ACCEPT) > > > target prot opt source destination > > > --------------------- > > > Regards > > > > > > =E2=80=AB=E2=80=AAJohn Lauro=E2=80=AC=E2=80=8F <=E2=80=AAjohnalauro@g= mail.com=E2=80=AC=E2=80=8F> =D8=AF=D8=B1 =D8=AA=D8=A7=D8=B1=DB=8C=D8=AE =DA= =86=D9=87=D8=A7=D8=B1=D8=B4=D9=86=D8=A8=D9=87 =DB=B1 =D8=B3=D9=BE=D8=AA=D8= =A7=D9=85=D8=A8=D8=B1 > > > =DB=B2=DB=B0=DB=B2=DB=B1 =D8=B3=D8=A7=D8=B9=D8=AA =DB=B2=DB=B1:=DB=B5= =DB=B1 =D9=86=D9=88=D8=B4=D8=AA:=E2=80=AC > > > > > > > > Just a guess, but I would be suspicious about connection tracking c= ausing the issue. What are your firewall rules? > > > > > > > > =E2=80=AAOn Wed, Sep 1, 2021 at 9:51 AM =E2=80=AB=D8=AD=D8=A7=D9=85= =D8=AF =D8=B5=D8=A7=D8=A8=D8=B1=E2=80=AC=E2=80=8E wrote:= =E2=80=AC > > > >> > > > >> Dear friends, > > > >> I have configured 3 wireguard interfaces on 2 servers to act as a > > > >> chained VPN for me (to bypass the internet censorship in my countr= y), > > > >> with this schema: > > > >> > > > >> client -- wg0 on middle-node -- wg1 on middle node -- wg2 on exit = node > > > >> (to free internet) > > > >> > > > >> Everything works fine, but after a while, the connection between w= g1 > > > >> and wg2 drops and I can't find the reason. The connection comes ba= ck > > > >> to action by simply switching the wg1 down and up again using > > > >> wg-quick. And the amazing behaviour is that sometimes the connecti= on > > > >> comes back to work automatically after some random time passes, > > > >> without any actions from my side (sometimes after a few tens of > > > >> minutes, sometimes after a few hours). > > > >> When the wg1-wg2 connection is not working, anything else between = 2 > > > >> servers (middle-node and exit-node) works fine. I mean I can ping = the > > > >> public IP of each server from another part, but the local wireguar= d ip > > > >> of none of them are accessible. > > > >> > > > >> I tried to monitor the situation and read the logs but couldn't fi= nd > > > >> what is happening here, so please help! > > > >> > > > >> The configuration: > > > >> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D > > > >> > > > >> client (my mobile phone): > > > >> ------------------------------------------- > > > >> [Interface] > > > >> Address =3D 10.10.20.2/32 > > > >> PrivateKey =3D > > > >> DNS =3D 10.10.10.1 > > > >> > > > >> ### Middle Node > > > >> [Peer] > > > >> PublicKey =3D > > > >> PresharedKey =3D > > > >> AllowedIPs =3D 0.0.0.0/0 > > > >> Endpoint =3D middle-node:50842 > > > >> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D > > > >> > > > >> wg0 (in middle-node server): > > > >> ------------------------------------------- > > > >> [Interface] > > > >> Address =3D 10.10.20.1/24 > > > >> ListenPort =3D 50842 > > > >> PrivateKey =3D > > > >> > > > >> ### Client > > > >> [Peer] > > > >> PublicKey =3D > > > >> PresharedKey =3D > > > >> AllowedIPs =3D 10.10.20.2/32 > > > >> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D > > > >> > > > >> wg1 (again in middle-node server): > > > >> ------------------------------------------- > > > >> [Interface] > > > >> Address =3D 10.10.10.2/32 > > > >> PrivateKey =3D > > > >> > > > >> PostUp =3D ip route add default dev wg1 table middle > > > >> PostUp =3D ip rule add iif wg0 lookup middle > > > >> PostUp =3D wg set wg1 peer allow= ed-ips 0.0.0.0/0 > > > >> > > > >> PreDown =3D ip route del default dev wg1 table middle > > > >> PreDown =3D ip rule del iif wg0 lookup middle > > > >> > > > >> ### Exit Node > > > >> [Peer] > > > >> PublicKey =3D > > > >> PresharedKey =3D > > > >> AllowedIPs =3D 10.10.10.1/32 > > > >> Endpoint =3D exit-node:50842 > > > >> PersistentKeepalive =3D 25 > > > >> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D > > > >> > > > >> wg2 (in exit-node server): > > > >> ------------------------------------------- > > > >> [Interface] > > > >> Address =3D 10.10.10.1/24 > > > >> ListenPort =3D 50842 > > > >> PrivateKey =3D > > > >> > > > >> PostUp =3D iptables -A FORWARD -i eth0 -o wg2 -j ACCEPT > > > >> PostUp =3D iptables -A FORWARD -i wg2 -j ACCEPT > > > >> PostUp =3D iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE > > > >> > > > >> PostDown =3D iptables -D FORWARD -i eth0 -o wg2 -j ACCEPT > > > >> PostDown =3D iptables -D FORWARD -i wg2 -j ACCEPT > > > >> PostDown =3D iptables -t nat -D POSTROUTING -o eth0 -j MASQUERADE > > > >> > > > >> ### Middle Node > > > >> [Peer] > > > >> PublicKey =3D > > > >> PresharedKey =3D > > > >> AllowedIPs =3D 10.0.0.0/8 > > > >> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D > > > >> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D > > > >> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D > > > >> > > > >> Sample log of dmesg when the wg1-wg2 connection is not working: > > > >> ------------------------------------------- > > > >> [Wed Sep 1 11:19:32 2021] wireguard: wg1: Sending keepalive packe= t to > > > >> peer 12 (~exit-node-ip~:50842) > > > >> [Wed Sep 1 11:19:44 2021] wireguard: wg0: Sending keepalive packe= t to > > > >> peer 8 (~client-ip~:65323) > > > >> [Wed Sep 1 11:19:44 2021] wireguard: wg1: Receiving keepalive pac= ket > > > >> from peer 12 (~exit-node-ip~:50842) > > > >> [Wed Sep 1 11:20:09 2021] wireguard: wg0: Receiving handshake > > > >> initiation from peer 8 (~client-ip~:65323) > > > >> [Wed Sep 1 11:20:09 2021] wireguard: wg0: Sending handshake respo= nse > > > >> to peer 8 (~client-ip~:65323) > > > >> [Wed Sep 1 11:20:09 2021] wireguard: wg0: Keypair 2867 destroyed = for peer 8 > > > >> [Wed Sep 1 11:20:09 2021] wireguard: wg0: Keypair 2871 created fo= r peer 8 > > > >> [Wed Sep 1 11:20:09 2021] wireguard: wg0: Receiving keepalive pac= ket > > > >> from peer 8 (~client-ip~:65323) > > > >> [Wed Sep 1 11:21:19 2021] wireguard: wg0: Sending keepalive packe= t to > > > >> peer 8 (~client-ip~:65323) > > > >> [Wed Sep 1 11:21:24 2021] wireguard: wg1: Retrying handshake with > > > >> peer 12 (~exit-node-ip~:50842) because we stopped hearing back aft= er > > > >> 15 seconds > > > >> [Wed Sep 1 11:21:24 2021] wireguard: wg1: Sending handshake > > > >> initiation to peer 12 (~exit-node-ip~:50842) > > > >> [Wed Sep 1 11:21:30 2021] wireguard: wg1: Handshake for peer 12 > > > >> (~exit-node-ip~:50842) did not complete after 5 seconds, retrying = (try > > > >> 2) > > > >> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D > > > >> > > > >> Sample log of dmesg when the wg1-wg2 connection is coming back usi= ng > > > >> manual restart: > > > >> ------------------------------------------- > > > >> [Wed Sep 1 11:45:52 2021] wireguard: wg1: Sending handshake > > > >> initiation to peer 12 (~exit-node-ip~:50842) > > > >> [Wed Sep 1 11:45:52 2021] wireguard: wg0: Sending keepalive packe= t to > > > >> peer 8 (~client-ip~:2335) > > > >> [Wed Sep 1 11:45:58 2021] wireguard: wg1: Handshake for peer 12 > > > >> (~exit-node-ip~:50842) did not complete after 5 seconds, retrying = (try > > > >> 3) > > > >> [Wed Sep 1 11:45:58 2021] wireguard: wg1: Sending handshake > > > >> initiation to peer 12 (~exit-node-ip~:50842) > > > >> [Wed Sep 1 11:45:58 2021] wireguard: wg1: Keypair 2878 destroyed = for peer 12 > > > >> [Wed Sep 1 11:45:58 2021] wireguard: wg1: Peer 12 > > > >> (~exit-node-ip~:50842) destroyed > > > >> [Wed Sep 1 11:45:58 2021] wireguard: wg1: Interface destroyed > > > >> [Wed Sep 1 11:45:58 2021] wireguard: wg1: Interface created > > > >> [Wed Sep 1 11:45:58 2021] wireguard: wg1: Peer 13 created > > > >> [Wed Sep 1 11:45:58 2021] wireguard: wg1: Sending keepalive packe= t to > > > >> peer 13 (~exit-node-ip~:50842) > > > >> [Wed Sep 1 11:45:58 2021] wireguard: wg1: Sending handshake > > > >> initiation to peer 13 (~exit-node-ip~:50842) > > > >> [Wed Sep 1 11:45:58 2021] wireguard: wg1: Receiving handshake > > > >> response from peer 13 (~exit-node-ip~:50842) > > > >> [Wed Sep 1 11:45:58 2021] wireguard: wg1: Keypair 2881 created fo= r peer 13 > > > >> [Wed Sep 1 11:46:12 2021] wireguard: wg0: Receiving keepalive pac= ket > > > >> from peer 8 (~client-ip~:2335) > > > >> [Wed Sep 1 11:46:14 2021] wireguard: wg1: Receiving keepalive pac= ket > > > >> from peer 13 (~exit-node-ip~:50842) > > > >> [Wed Sep 1 11:46:27 2021] wireguard: wg0: Sending keepalive packe= t to > > > >> peer 8 (~client-ip~:2335) > > > >> [Wed Sep 1 11:46:28 2021] wireguard: wg1: Receiving keepalive pac= ket > > > >> from peer 13 (~exit-node-ip~:50842) > > > >> [Wed Sep 1 11:46:52 2021] wireguard: wg1: Receiving keepalive pac= ket > > > >> from peer 13 (~exit-node-ip~:50842) > > > >> > > > >> > > > >> Thanks in advance for your kind help