talexander/machine_setup
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Copy over some networking sysctls from my ansible playbook.

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This commit is contained in:
Tom Alexander 2025-04-11 19:22:05 -04:00
parent a97a03f642
commit 144f83982d
Signed by: talexander
GPG Key ID: D3A179C9A53C0EDE
1 changed files with 21 additions and 0 deletions
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21
nix/configuration/roles/network/default.nix
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@ -68,4 +68,25 @@
# Set wifi to US
options cfg80211 ieee80211_regdom=US
'';
boot.kernel.sysctl = {
# Enable TCP packetization-layer PMTUD when an ICMP black hole is detected.
"net.ipv4.tcp_mtu_probing" = 1;
# Switch to bbr tcp congestion control which should be better on lossy connections like bad wifi.
# We set this in the kernel config, but include this here for unoptimized builds.
"net.ipv4.tcp_congestion_control" = "bbr";
# Don't do a slow start after a connection has been idle for a single RTO.
"net.ipv4.tcp_slow_start_after_idle" = 0;
# 3x time to accumulate filesystem changes before flushing to disk.
"vm.dirty_writeback_centisecs" = 1500;
# Adjust ttl
"net.ipv4.ip_default_ttl" = 65;
"net.ipv6.conf.all.hop_limit" = 65;
"net.ipv6.conf.default.hop_limit" = 65;
# Enable IPv6 Privacy Extensions
"net.ipv6.conf.all.use_tempaddr" = 2;
# Enable IPv6 Privacy Extensions
# This is enabled by default in nixos.
# "net.ipv6.conf.default.use_tempaddr" = 2;
};
}