[richard-ramos]

Summary

Reuse a Linux IPv6 wildcard QUIC listener for IPv4 dials when the socket is
actually dual-stack. This avoids opening a separate ephemeral IPv4 UDP socket
and keeps outbound QUIC traffic on the configured listener port.

Affected Areas

• Transports — QUIC listener selection

Dependencies

• Draft: feat(datagram): expose received destination address status-im/nim-chronos#743
• Draft: fix(transport): preserve wildcard socket source addresses nim-lsquic#174

Impact on Library Users

Linux nodes listening on a dual-stack IPv6 wildcard address no longer need an
additional IPv4 dial-only UDP socket. Exact-family listeners remain preferred,
and specific IPv6 binds are not reused for IPv4.

Risk Assessment

Reuse is limited to IPv6 wildcard sockets whose kernel dual-stack option is
enabled. Other platforms and socket configurations retain the existing
selection behavior.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 90.90909% with 1 line in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (release/v2.3@ab49dc9). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
libp2p/transports/quictransport.nim	90.90%	1 Missing ⚠️

Additional details and impacted files

@@               Coverage Diff               @@
##             release/v2.3    #3156   +/-   ##
===============================================
  Coverage                ?   82.09%           
===============================================
  Files                   ?      181           
  Lines                   ?    32693           
  Branches                ?       12           
===============================================
  Hits                    ?    26840           
  Misses                  ?     5853           
  Partials                ?        0           

Files with missing lines	Coverage Δ
libp2p/transports/quictransport.nim	87.91% <90.90%> (ø)

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.