53 lines
1.6 KiB
Nix
53 lines
1.6 KiB
Nix
{
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pkgs,
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config,
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inputs,
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...
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}:
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{
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imports = [
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inputs.vpn-confinement.nixosModules.default
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];
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# network namespace that is proxied through mullvad
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vpnNamespaces.wg = {
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enable = true;
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wireguardConfigFile = config.age.secrets.wg0-conf.path;
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accessibleFrom = [
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# "192.168.0.0/24"
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];
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};
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boot = {
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# BBR congestion control handles variable-latency VPN connections much
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# better than CUBIC by probing bandwidth continuously rather than
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# reacting to packet loss.
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kernelModules = [ "tcp_bbr" ];
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kernel.sysctl = {
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# Use BBR + fair queuing for smooth throughput through the WireGuard VPN
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"net.core.default_qdisc" = "fq";
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"net.ipv4.tcp_congestion_control" = "bbr";
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# Disable slow-start after idle: prevents TCP from resetting window
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# size on each burst cycle (the primary cause of the 0 -> 40 MB/s spikes)
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"net.ipv4.tcp_slow_start_after_idle" = 0;
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# Larger socket buffers to accommodate the VPN bandwidth-delay product
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# (22ms RTT * target throughput). Current 2.5MB max is too small.
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"net.core.rmem_max" = 16777216;
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"net.core.wmem_max" = 16777216;
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"net.ipv4.tcp_rmem" = "4096 87380 16777216";
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"net.ipv4.tcp_wmem" = "4096 65536 16777216";
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# Higher backlog for the large number of concurrent torrent connections
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"net.core.netdev_max_backlog" = 5000;
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# Faster cleanup of dead connections from torrent peer churn
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"net.ipv4.tcp_fin_timeout" = 15; # default 60
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"net.ipv4.tcp_tw_reuse" = 1;
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};
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};
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networking.firewall.trustedInterfaces = [ "wg-br" ];
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}
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