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| Subject: | RE: Ports for Cisco VPN 3000 Series |
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| 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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