Johnathan Corgan 385033fcb7 Add ICMPv6 Destination Unreachable and TUN reader/writer architecture
- New icmp.rs module: builds RFC 4443 compliant ICMPv6 Type 1 Code 0
  responses with proper checksum and packet validation
- TUN reader/writer separation: fd duplication allows independent I/O
  on separate threads
- TunWriter services mpsc queue for multiple future packet sources
- Reader now sends ICMPv6 errors for unroutable packets instead of
  silently dropping them
- 171 tests passing
2026-01-30 05:25:28 +00:00

FIPS Documentation

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design/ Protocol design specifications and analysis
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Description
The Free Internetworking Peering System
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