C: Прочие сведения по безопасности в Linux
Firewalling and Proxy Server HOWTO
http://metalab.unc.edu/LDP/HOWTO/Firewall-HOWTO.html
Linux IPCHAINS HOWTO
http://metalab.unc.edu/LDP/HOWTO/IPCHAINS-HOWTO.html
Linux NETFILTER HOWTO
http://netfilter.kernelnotes.org
Linux Security HOWTO
http://metalab.unc.edu/LDP/HOWTO/Security-HOWTO.html
Linux Shadow Password HOWTO
http://metalab.unc.edu/LDP/HOWTO/Shadow-Password-HOWTO.html
The Linux CIPE + Masquerading mini-HOWTO
http://metalab.unc.edu/LDP/HOWTO/mini/Cipe+Masq.html
Firewall Piercing mini-HOWTO
http://metalab.unc.edu/LDP/HOWTO/mini/Firewall-Piercing.html
Quota mini-HOWTO
http://metalab.unc.edu/LDP/HOWTO/mini/Quota.html
Secure POP via SSH mini-HOWTO
http://metalab.unc.edu/LDP/HOWTO/mini/Secure-POP+SSH.html
The VPN HOWTO (using SSH)
http://metalab.unc.edu/LDP/HOWTO/mini/VPN.html
Red Hat Knowledge Base
http://www.redhat.com/cgi-bin/support?faq