IPSec protocol number??

Hello, When I was reading Cisco doc, it says "IPSec ESP and AH protocols use protocol numbers 50 and 51". What is protocol number? I've never heard of it. How can you block it? Thanks in advance. Jim __ Do You Yahoo!? Get email at your own domain

Re: IPSec protocol number??

Well every protocol has a numeric value it represents. It's the same with TCP (protocol 6) and UDP (protocol 17). Should get on a UNIX machine and checkout the list of protocols and their matching numeric value (you can typically locate as /etc/protocols). Respectfully, Je

Re: IPSec protocol number??

¡Hola! > When I was reading Cisco doc, it says "IPSec ESP and > AH protocols use protocol numbers 50 and 51". What is > protocol number? It's a field of IP header that says what protocol is the packet carrying (tcp, udp, icpm, gre, ipip, ipsec, etc). Read RFC791 for more info.