58 lines
2.1 KiB
Nix
58 lines
2.1 KiB
Nix
{ ... }: {
|
|
# https://nixos.wiki/wiki/Networking
|
|
# https://nixos.wiki/wiki/Systemd-networkd
|
|
|
|
networking = {
|
|
firewall = {
|
|
# Allow some ports for ad-hoc use
|
|
allowedTCPPorts = [ 1234 1337 8000 8080 ];
|
|
allowedUDPPorts = [ 1234 1337 8000 8080 ];
|
|
# Do not spam dmesg/journalctl with refused connections
|
|
logRefusedConnections = false;
|
|
};
|
|
nameservers = [ "127.0.0.53" ]; # resolved stub resolver
|
|
search = [ "caspervk.net" ];
|
|
};
|
|
|
|
# TODO: these systemd networkd settings will be the default once
|
|
# https://github.com/NixOS/nixpkgs/pull/202488 is merged.
|
|
networking.useNetworkd = true;
|
|
systemd.network.enable = true;
|
|
|
|
# systemd-resolved provides DNS resolution to local applications through
|
|
# D-Bus, NSS, and a local stub resolver on 127.0.0.53. It implements caching
|
|
# and DNSSEC validation. We configure it to only, and always, use
|
|
# dns.caspervk.net over TLS. By the way, it's surprisingly hard to get the
|
|
# system to always follow the custom DNS servers rather than the
|
|
# DHCP-provided ones. Check the traffic with:
|
|
# sudo tcpdump -n --interface=any '(udp port 53) or (tcp port 853)'
|
|
# https://nixos.wiki/wiki/Encrypted_DNS
|
|
# https://nixos.wiki/wiki/Systemd-resolved
|
|
services.resolved = {
|
|
enable = true;
|
|
dnssec = "true";
|
|
# Resolved falls back to DNS servers operated by American internet
|
|
# surveillance and adtech companies by default. No thanks, I'd rather have
|
|
# no DNS at all.
|
|
fallbackDns = [ "159.69.4.2#dns.caspervk.net" "2a01:4f8:1c0c:70d1::1#dns.caspervk.net" ];
|
|
extraConfig = ''
|
|
DNS=159.69.4.2#dns.caspervk.net 2a01:4f8:1c0c:70d1::1#dns.caspervk.net
|
|
DNSOverTLS=yes
|
|
'';
|
|
};
|
|
|
|
# TCP BBR has significantly increased throughput and reduced latency. Note
|
|
# that the IPv4 setting controls both IPv4 and IPv6.
|
|
boot.kernel.sysctl = {
|
|
"net.ipv4.tcp_congestion_control" = "bbr";
|
|
};
|
|
|
|
# vnStat keeps a log of hourly, daily and monthly network traffic
|
|
services.vnstat.enable = true;
|
|
environment.persistence."/nix/persist" = {
|
|
directories = [
|
|
{ directory = "/var/lib/vnstat"; user = "root"; group = "root"; mode = "0755"; }
|
|
];
|
|
};
|
|
}
|