6 Aug 2012
http://www.cromwell-intl.com/tcpip/routing.html - mais simples, impossível!
http://www.networksorcery.com/enp/protocol/icmp/msg3.htm
http://www.linuxplanet.com/linuxplanet/tutorials/6524/1
http://www.gentoo.org/doc/en/security/security-handbook.xml?part=1&chap…
http://www.pcvr.nl/tcpip/ip_rout.htm
http://fixunix.com/networking/250247-anybody-knows-how-disable-outbound…
http://lartc.org/howto/lartc.kernel.obscure.html
http://www.kernel.org/doc/man-pages/online/pages/man7/icmp.7.html
http://www.cyberciti.biz/faq/linux-kernel-etcsysctl-conf-security-harde…