Date: Sun, 03 Aug 2025 17:25:39 +0000 From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 288638] "kern.ipc.nmbufs limit reached" when running BGP and OSPF over Wireguard Message-ID: <bug-288638-227@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=288638 Bug ID: 288638 Summary: "kern.ipc.nmbufs limit reached" when running BGP and OSPF over Wireguard Product: Base System Version: 14.3-STABLE Hardware: amd64 OS: Any Status: New Severity: Affects Only Me Priority: --- Component: kern Assignee: bugs@FreeBSD.org Reporter: freebsd@bodems.net I'm running FreeBSD 14.3 on two routers in two datacenters with BGP uplinks and internal OSPF managed by net/bird2 and one OpenWrt router at home running OSPF with bird2. Before using Wireguard, the two routers where connected via GRE tunnels and everything was fine. Then I decided two replace the GRE tunnels with Wireguard tunnels. First I replaced the tunnels to my home router. Then, after one day, networking at both routers stopped working and the kernel log printed "kern.ipc.nmbufs limit reached". I increased the nmbufs limit to 1000000 and first it looked like it worked. Now I replaced the tunnel between the two FreeBSD routers and again I reached the nmbufs limit. At one router I am now at kern.ipc.nmbclusters="4000000", the other one is now at kern.ipc.nmbclusters="5000000" and I don't know if they run stable with this. >From my understanding, both values are far away from normal. In my Wireguard configuration I use the option Table = off and the peer configuration has AllowedIPs = 0.0.0.0/0,::/0, because bird2 fills the routing table for me. Any ideas on what to look at? I once had a "normal" Wireguard setup, where Wireguard did the routing and this setup just worked as intended, so I think it has something to do with the combination of Wireguard and net/bird2. -- You are receiving this mail because: You are the assignee for the bug.home | help
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