GoKawiilGSoC 2026 project overhauls NAT traversal and IPv6 support in NetBSD's racoon2 IKE daemon
Google Summer of Code participant Artem Belan spent summer 2026 reworking racoon2, NetBSD's IKEv1/IKEv2 key exchange daemon, fixing RFC 7383 message fragmentation, adding NAT-OA payload handling for IKEv1 Quick Mode, improving IPv6 support, and building an automated test suite. The work was merged upstream via pull requests #13 through #39 on the project's gsoc2026 branch between June and September 2026.
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These fixes could make racoon2 viable as an L2TP/IPsec or IKEv2 VPN server that works reliably behind NAT for stock Windows, iOS and Android VPN clients, a use case the project's own TODO list flagged as broken. The added unit test framework suggests an effort to keep these fixes from regressing as the codebase continues to be modernized.
- racoon2's IKE fragmentation now follows RFC 7383, preventing crashes from oversized packets.
- NAT original address (NAT-OA) payload support was added for IKEv1 Quick Mode per RFC 3947.
- A new automated test suite accompanies the changes, aiming to lock in the fixes long-term.
Source: blog.netbsd.org, 2026-10-04
Published there as: “Improving and Stabilizing the Racoon2 IKE Daemon in NetBSD”
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