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Enable the firewall.

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Now that we have networking working, I can enable the firewall and confirm nothing breaks.
This commit is contained in:
Tom Alexander
2026-01-01 10:21:36 -05:00
parent e26c83e2ad
commit a8f1f69570
4 changed files with 28 additions and 4 deletions
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6
nix/kubernetes/roles/debugging/default.nix
View File

@@ -27,7 +27,9 @@
ldns # for drill
];
networking.firewall.enable = false; # TODO: This is just here for debugging / initial development.
# TODO: Maybe use networking.nftables.enable to switch to nftables?
# This can make debugging easier by rejecting packets instead of dropping them:
networking.firewall.rejectPackets = true;
# Log each rejected packet instead of just each connection.
networking.firewall.logRefusedPackets = true;
};
}

18
nix/kubernetes/roles/firewall/default.nix
View File

@@ -26,15 +26,29 @@
"net.bridge.bridge-nf-call-iptables" = 1;
"net.bridge.bridge-nf-call-ip6tables" = 1;
"net.ipv4.ip_forward" = 1;
# Enable forwarding on all interfaces.
# "net.ipv4.conf.all.forwarding" = 1;
# "net.ipv6.conf.all.forwarding" = 1;
};
networking.firewall.enable = false;
networking.nftables.enable = true;
# We want to filter forwarded traffic.
# Also needed for `networking.firewall.extraForwardRules` to do anything.
networking.firewall.filterForward = true;
# This can make debugging easier by rejecting packets instead of dropping them:
# networking.firewall.rejectPackets = true;
networking.firewall.extraInputRules = ''
ip6 saddr 2620:11f:7001:7:ffff:eeee::/96 accept
ip6 saddr fd00:3e42:e349::/112 accept
ip6 saddr 2620:11f:7001:7:ffff:ffff:0ad7:0100/120 accept
'';
networking.firewall.extraForwardRules = ''
ip6 daddr 2620:11f:7001:7:ffff:eeee::/96 accept
ip6 daddr fd00:3e42:e349::/112 accept
ip6 daddr 2620:11f:7001:7:ffff:ffff:0ad7:0100/120 accept
'';
# Check logs for blocked connections:
# journalctl -k or dmesg