>From the IANA:
"In the Internet Protocol (IP) [DDN], [RFC791] there is a field, called
Protocol, to identify the next level protocol. This is an 8 bit field."
Look here:
http://www.isi.edu/in-notes/iana/assignments/protocol-numbers
for all the gory details...
Dale
[=`)
>From: George Zhang <[EMAIL PROTECTED]>
>Reply-To: George Zhang <[EMAIL PROTECTED]>
>To: [EMAIL PROTECTED]
>Subject: A question about IPSec
>Date: Thu, 31 Aug 2000 09:33:24 -0500
>
>I read the following form Cisco documentation about IPSec:
>
>"IKE uses UDP port 500. The IPSec ESP and AH protocols use PROTOCOL
>numbers 50 and 51. Ensure that your access-list are configured so that
>50, 51 and UDP port 500 traffic is not blocked ..."
>
>My question is, what are the PROTOCOL numbers? This is the first time I
>read or heard about "PROTOCOL number"? I know many protocols by names
>such as TCP, UDP, ICMP etc, by I have never heard about PROTOCOL
>numbers? What protocols 50 and 51 are associated with? Could someone
>please explain that to me? Thanks.
>
>George Zhang, CCNP
>
>
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