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blumeops/docs/changelog.d/ringtail-static-ip.infra.md
Erich Blume a4a30aad44 fix(ringtail): explicitly enable net.ipv4.ip_forward 
After the static IP change, k3s/flannel pod networking broke because
ip_forward was 0. NixOS doesn't enable IP forwarding by default — it
was previously being set implicitly somewhere in the NM-managed /
scripted-DHCP path. With static networking we have to set it ourselves.

Verified at runtime via sysctl -w before adding here; pod outbound
came back immediately and Tailscale VIP services recovered without
any pod restarts.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
2026-05-12 09:51:16 -07:00

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Pin ringtail's wired IP to 192.168.1.21 via NixOS scripted networking; NetworkManager no longer manages enp5s0. Removes DHCP lease renewal as a failure mode after a silent lease teardown took ringtail offline. Also explicitly enables net.ipv4.ip_forward (previously set implicitly by scripted-DHCP) so k3s pod networking and Tailscale routing continue to work with static networking.