Johnathan Corgan 2a37e2716f DNS responder for .fips domain, two-node UDP example ...

Add DNS responder that resolves <npub>.fips queries to FipsAddress IPv6
addresses. Resolution is pure computation (npub → NodeAddr → IPv6) with
identity cache priming as a side effect, enabling subsequent TUN packet
routing to non-peer destinations.

- New dns.rs module: resolve_fips_query(), handle_dns_packet() using
  simple-dns crate, run_dns_responder() async UDP server loop
- DnsConfig in config.rs: enabled, bind_addr (127.0.0.1), port (5354)
- Fourth select! arm in RX event loop for DNS identity channel
- DNS task spawn/abort in node lifecycle
- 10 new tests (420 total)

Add examples/two-node-udp/ with standalone walkthrough for testing two
FIPS nodes in Linux network namespaces over a veth pair. Includes
network diagram, config files, DNS routing setup, and troubleshooting.

2026-02-13 11:35:24 +00:00

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two-node-udp

DNS responder for .fips domain, two-node UDP example

2026-02-13 11:35:24 +00:00