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ryan4yin | 二花
a0ff9f7fd7
* fix(ssh): retry and multiplex LAN connections * fix(ai): shrink the neighbour-probe fallback to ~1s Assisted-by: DeepSeek Harness 0.2.0-rc.2 (deepseek-flash)
36 lines
1.6 KiB
Nix
36 lines
1.6 KiB
Nix
{
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config,
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myvars,
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...
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}:
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let
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# The wired link to the router, i.e. the one that leaves through the Mesh WiFi
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# backhaul to the homelab. Taken from `hostsAddr` so a NIC rename cannot leave
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# these tunings pointing at a table that no longer exists.
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iface = myvars.networking.hostsAddr.${config.networking.hostName}.iface;
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in
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{
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# WA-035: the mesh backhaul drops unicast to a peer whose MAC it has aged out
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# while still flooding broadcast, so a connection to an idle peer waits for the
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# kernel to give up on unicast ARP and fall back to broadcast. Walk that
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# neighbour state machine in ~1s instead of ~10s, which fits inside ssh's 5s
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# retry window (see `home/base/tui/ssh.nix` for the other half).
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#
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# Cost: while a peer is genuinely down, probes go out 5x faster for the same
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# bounded count -- one unicast probe, then the unchanged broadcast attempts. The
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# failed-neighbour re-probe pace (`interval_probe_time_ms`) is deliberately left
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# alone, so a peer that stays down is not probed more often than before.
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#
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# `default` and the link's own table are both set: a device copies `default`
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# when it is registered, so a later write to `default` does not reach a table
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# that already exists.
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boot.kernel.sysctl = {
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"net.ipv4.neigh.default.delay_first_probe_time" = 1; # revalidate after 1s, not 5s
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"net.ipv4.neigh.default.retrans_time_ms" = 200; # probe every 200ms, not 1s
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"net.ipv4.neigh.default.ucast_solicit" = 1; # one unicast probe, then broadcast
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"net.ipv4.neigh.${iface}.delay_first_probe_time" = 1;
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"net.ipv4.neigh.${iface}.retrans_time_ms" = 200;
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"net.ipv4.neigh.${iface}.ucast_solicit" = 1;
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};
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}
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