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Enable the firewall.

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This commit is contained in:
Tom Alexander
2026-04-18 15:49:08 -04:00
parent 01f2927bd4
commit a5e70c5d4e
4 changed files with 94 additions and 18 deletions
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51
nix/kubernetes/roles/firewall/default.nix
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@@ -32,23 +32,54 @@
# "net.ipv6.conf.all.forwarding" = 1;
};
networking.firewall.enable = false;
networking.firewall.enable = true;
networking.nftables.enable = true;
# We want to filter forwarded traffic.
# Also needed for `networking.firewall.extraForwardRules` to do anything.
networking.firewall.filterForward = 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
# Allow traffic from the pods on the lxc interfaces even though the interfaces do not have the correct ip addressses set for the return path.
networking.firewall.extraReversePathFilterRules = ''
iifname "lxc*" ip6 saddr 2620:11f:7001:7:ffff:eeee::/96 accept
iifname "lxc*" ip saddr 10.200.0.0/16 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
'';
networking.firewall.extraInputRules = builtins.concatStringsSep "\n" [
# Allow pod-to-node communication
''
ip6 saddr 2620:11f:7001:7:ffff:eeee::/96 accept
''
];
# 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 = builtins.concatStringsSep "\n" [
# Allow pod to external communication
''
iifname "lxc*" ip6 saddr 2620:11f:7001:7:ffff:eeee::/96 accept
iifname "lxc*" ip saddr 10.200.0.0/16 accept
''
# Allow pod-to-pod communication
''
ip saddr 10.200.0.0/16 ip daddr 10.200.0.0/16 accept
ip6 saddr 2620:11f:7001:7:ffff:eeee::/96 ip6 daddr 2620:11f:7001:7:ffff:eeee::/96 accept
''
# Allow external-to-pod communication
''
ip daddr 10.200.0.0/16 accept
ip6 daddr 2620:11f:7001:7:ffff:eeee::/96 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