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The gateway is designed for systems already serving DHCP and DNS to a LAN segment (canonically an OpenWrt AP). On those systems port 53 is already taken by the existing resolver, so the prior `[::]:53` default conflicted with the gateway's intended deployment target out of the box. The OpenWrt ipk previously overrode this in its packaged config as a workaround; matching the source default to what the canonical deployment actually wants makes the override redundant and removes a foot-gun for fresh manual Linux-host installs. The redundant `dns.listen` line in `packaging/openwrt-ipk/files/etc/fips/fips.yaml` is dropped along with this change. Operators on a host without a pre-existing resolver on port 53 can opt back into the wildcard bind by setting `dns.listen: "[::]:53"` explicitly. The new default binds IPv6 loopback only — Linux IPv6 sockets bound to explicit `::1` do not accept v4-mapped traffic, so forwarders that reach the gateway over IPv4 loopback need to be pointed at an explicit IPv4 listen address instead. Touches the gateway config struct and its default-value test, the commented-out gateway example in the Debian common fips.yaml, the OpenWrt ipk config (override removed), the gateway reference / how-to / design / tutorial / troubleshoot docs, and a CHANGELOG entry under [Unreleased] -> Changed.
Reference
Information-oriented technical descriptions for lookup on demand. Reference content describes what is: wire formats, configuration keys, command-line flags, control-socket commands, default values, file paths, exit codes. It is consulted, not read end-to-end.
Reference is austere by design: minimal narrative, no opinions, no guidance on when to use a feature. The "why" lives in design/; the "how do I accomplish X" lives in how-to/.
Available Reference
| Document | Scope |
|---|---|
| wire-formats.md | All FMP and FSP message byte layouts, encapsulation walkthrough |
| configuration.md | Full YAML configuration reference for the daemon and gateway |
| security.md | nftables baseline, peer ACL, cryptographic primitives, rekey defaults, threat-resistance matrix |
| nostr-events.md | Kind 37195 advert, Kind 21059 traversal signaling, Kind 10050 inbox relays |
| transports.md | Per-transport statistics counter inventory |
| control-socket.md | Line-delimited JSON control protocol for the daemon and gateway |
| cli-fips.md | fips daemon CLI: options, exit codes, environment, files |
| cli-fipsctl.md | fipsctl control-client: subcommands, options, exit codes |
| cli-fipstop.md | fipstop live-status TUI: tabs, keybindings |
| cli-fips-gateway.md | fips-gateway service CLI: options, exit codes, files |