Nice manual. Good to see that they show the raw sockets api and libraries using them side by side. Skimming through it though, it a eems a bit thin on ipv6 details, e.g. recvmsg is not mentioned, but is indispensable for receiving ancillary data from ipv6 icmp packets.
Skimming it, unless I missed it, under Linux there is no mention of epoll, edge vs level triggering. Things you should familiarize yourself with if you care about performance.
