from
http://www.isi.edu/in-notes/iana/assignments/protocol-numbers
PROTOCOL NUMBERS
In the Internet Protocol version 4 (IPv4) [RFC791] there is a field,
called "Protocol", to identify the next level protocol. This is an 8
bit field. In Internet Protocol version 6 (IPv6) [RFC1883] this field
is called the "Next Header" field.
Stefano
> -----Original Message-----
> From: George Zhang [mailto:[EMAIL PROTECTED]]
> Sent: giovedì 31 agosto 2000 16.33
> To: [EMAIL PROTECTED]
> Subject: A question about IPSec
>
>
> 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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