This is a partial list of new features and systems included in OpenBSD 5.5. For a comprehensive list, see the changelog leading to 5.5.
Generic network stack improvements:
- Added vxlan(4), a virtual extensible local area network tunnel interface.
- pflow(4) now sends 64 bit time values for pflowproto 10. The changed templates / flows for pflowproto 10 are now parsable by existing receivers.
- Continued improvement of the checksum offload framework to streamline the calculation of TCP, UDP, ICMP, and ICMPv6 checksums.
- Enabled IPv6 routing domain support.