Kernel

http://blog.beyond-syntax.com/2011/03/diving-into-linux-networking-i/ Overview of how network driver work in linux kernel

http://justanothergeek.chdir.org/2011/01/linux-security-one-year-later.html review of the security related things that happened in the linux kernel circles in 2010.

http://nag.ru/articles/article/19974/kak-my-10gigabit-na-linux-routere-marshrutizirovali.html

http://translate.google.com/translate?u=http://habrahabr.ru/blogs/linux/108629/&sl=ru&tl=en&hl=&ie=UTF-8 Russian original http://habrahabr.ru/blogs/linux/108629/

http://lwn.net/Articles/413255/ [LWN comment by Jim Shewmaker, a security researcher]

http://events.linuxfoundation.org/slides/2010/linuxcon2010_wheeler.pdf PDF slides that show what happens if you create a file system with one billion (10**9 ) files

http://nfws.inl.fr/nfws_userday/Jesper-Brouer_Large-iptables-rulesets.pdf Netfilter: Making large iptables rulesets scale

http://www.ibm.com/developerworks/views/linux/libraryview.jsp?site_id=1&contentarea_by=Linux&sort_by=Date&sort_order=1&start=1&end=3&topic_by=-1&product_by=&type_by=Articles&show_abstract=true&search_by=kernel%20apis, Series of short articles on linux kernel [2.6.27] APIs by Tim Jones

http://www.ibm.com/developerworks/linux/library/l-linuxboot/ [short] reference for linux boot process

http://vger.kernel.org/~davem/skb.html details about important linux kernel networking subsystem data structure called “skb”