Portability issues (3)

Be careful about portability to 64bit architecture

Packed structs causes panic on sockaddr_in6
sa = (sa + 1);

Routing socket: align to sizeof(long)
sys/net/rtsock.c

SIOCGIFCONF: returns packed struct
getifaddrs() is useful if available.

Pointer to a particular position of a packet
unaligned struct pointer - do bcopy() if necessary.

At least, try compiling once on alpha machines