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Network Security Firewalls
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RE: Ports for Cisco VPN 3000 Series

Subject: RE: Ports for Cisco VPN 3000 Series
Date: Thu, 15 Sep 2005 09:06:04 -0700
ESP : IP Protocol 50. Is it like TCP port 50. Could you explain more
about this.

  IP packets contain a "protocol" field.  ICMP is protocol "1".  TCP
is protocol "6".  UDP is protocol "17".
  ESP is protocol "50".  GRE (used by some other VPN implementations)
is protocol "47", and I seem to recall that AH is protocol "51".

  Protocols 6 and 17 define a later field, "port number", which is used 
to identify specific connections within the handlers for those protocols.
  A security device that *only* lets you specify "port number" and
not also "protocol" is unlikely to be friendly to protocols other than
1, 6 and 17.

David Gillett


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