Starting with TCP/IP

All of networking starting with TCP/IP,

Just to reference for IP,TCP, UDP, ICMP header size..

Comparison of IPV4 and IPV6 header


IPV6 Header (protocol Number :41)




IPV4 Header (protocol Number: 4)


TCP Header (protocol number: 6)


UDP Header (protocol number :17)


ICMP Header (protocol number: 1)


http://nmap.org/book/tcpip-ref.html

Firewall Max Session comparison table

Ever wonder why Checkpoint firewall usually cost much more then comparable firewall??? I guess the following table give up pretty much a good detail of why do you have to pay a premium for that..