IPv6 and IPsec. (sys/netinet6/*, sys/netipsec/*, ..)
IPv6 and Firewalls
Network stack modularization
Secure Neighbor Discovery (SeND) (mentored a GSoC 2009 project)
SNMP related topics (mentored a GSoC 2006 project)
Building small images for embedded FreeBSD projects
netgraph (pppoe, ppp, l2tp) (I should merge my patches one day)
Jails - multi-IPv4/v6/no-IP jails.
Virtualization, VIMAGE, vnets, multiple network stacks for simulating and testing, ..
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The pet ^H^H^HFrankenstein project (z/FBSD)
SDIO