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router: ifconfig: disable linux arp proxy behavior by default

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By default, Linux will respond to ARP requests that belong to other interfaces. Normally this isn't a problem, but it causes issues since my WAN and LAN20 are technically bridged.
This commit is contained in:
Yuri Tatishchev 2025-03-29 23:01:40 -07:00
parent 02bab65de8
commit 49278204a4
Signed by: CaZzzer
GPG Key ID: E0EBF441EA424369
1 changed files with 6 additions and 0 deletions
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hosts/router/ifconfig.nix
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@ -46,6 +46,12 @@ let
}; };
in in
{ {
# By default, Linux will respond to ARP requests that belong to other interfaces.
# Normally this isn't a problem, but it causes issues
# since my WAN and LAN20 are technically bridged.
# https://networkengineering.stackexchange.com/questions/83071/why-linux-answers-arp-requests-for-ips-that-belong-to-different-network-interfac
boot.kernel.sysctl."net.ipv4.conf.default.arp_filter" = 1;
# It is impossible to do multiple prefix requests with networkd, # It is impossible to do multiple prefix requests with networkd,
# so I use dhcpcd for this # so I use dhcpcd for this
# https://github.com/systemd/systemd/issues/22571 # https://github.com/systemd/systemd/issues/22571