Perhaps I am being a little harsh with 2 stars, but I felt disappointed with this book. I was hoping for this "Integrated" aspect, where Cisco and *BSD/Linux could interoperate. Take VPNs for example - IPSEC. There is token coverage of how each *Nix does it - with the same operating system. There is no mention of how a Cisco IOS router with ipsec can be configured to work with any of the listed *Nix! Perhaps others will find some value in the other aspects of this book. I felt the book was a disjointed mish-mash of topics that one could easily google, and get up to date information. I would like to see this book (2nd ed.) cover opensource BGPD, OSPF, Ipsec - and please, keep it recent and accurate (OpenBSD ipfilter with 3.3?).