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The v6 NAT duplication only triggered for DomainSet destinations (modern DNS path). Legacy dynamic routes use a 0.0.0.0/0 prefix destination, so the v6 NAT rule was never created. Add a Dynamic field to RouterPair so the firewall manager can distinguish dynamic routes from exit nodes (both use /0 prefixes). Set it from route.IsDynamic() in routeToRouterPair and propagate through GetInversePair. Both nftables and iptables managers check pair.Dynamic instead of destination shape. Also accumulate errors in RemoveNatRule so v6 cleanup is attempted even if v4 removal fails.