The cell catch-all DROP rule blocked all traffic from a connected cell's
subnet, including ESTABLISHED/RELATED packets (ICMP replies, TCP ACKs) for
connections initiated by local VPN peers. This broke ping to the remote
cell's WireGuard IP even when the cell-to-cell tunnel was healthy.
Change the DROP to match only NEW,INVALID connections so established reply
traffic passes through to the stateful ACCEPT rule.
Also adds tests/e2e/wg/test_cell_to_cell_routing.py — an end-to-end test
that brings up a real WireGuard tunnel from the test runner to pic1 and
verifies full cross-cell routing including ICMP ping, API /health, and Caddy.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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