FV could not reach any site but Anaheim. The cause was a single outbound-NAT
rule on the FV gateway, added 2026-09-13 and scoped to Anaheim only --
docs/runbooks/fv-to-ana-nat.md says so in as many words: "Other remote sites
remain outside this fix's scope." Three mirrors added, same interface and
source, only the destination differing: 10.100.0.0/16, 10.0.0.0/16 and
10.6.110.0/24.
After: fv-ml1 reaches NH3, ESH, Anaheim, Irvine, the mesh and the internet.
Regression sweep clean across nh3-dev, nh3-docker and esh-docker-vm.
The runbook now records what the failure looks like, because it presents as a
routing or Tailscale fault and is neither. fv-ml1 reached mesh addresses
perfectly and LAN addresses not at all; the FV firewall log showed the outbound
passing with src=10.251.50.54 and no reply returning; temporary counting rules
proved nh3-scale received 5 packets and sent 4 replies; both peers' AllowedIPs
were correct. The discriminator that settles it is that every other site pair
works -- nh3-docker to esh/ana/FV and esh-docker-vm to FV all succeed -- so a
general subnet-to-subnet limitation is ruled out and only outbound SNAT is
left.
Also reverts the remote-site MASQUERADE rules added to nh3-scale earlier on the
asymmetric-return theory. They fired but were not the fix, so they are removed
rather than left to accumulate as NAT that achieves nothing.
Applied via source_nat/add_rule + apply with a pre-change config backup taken
first. Source scope is still fv-ml1's /32, so a second FV host will hit this
again -- flagged in the runbook.
vh
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