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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