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One thing to be aware of when using
IPSec is that interoperability among different vendors implementations
of the protocols is an on-going effort. As more and more standards
are finalized, successful interoperability is becoming more the rule
than the exception. But this is not always the case, particularly if
you are integrating new hardware or software into an existing IPSec
based network, test the new equipment on your network to make sure that
it works well with your existing configuration.
IPSec uses TCP port 1293 and UDP
IPSec protocol and port number information, to keep in mind if you are running IPSec across a router boundary:
IPSec uses TCP port 1293 and UDP port 1293.
ISAKMP uses UDP port 500 (sometimes UDP port 4500 when NAT is used).
Internet Assigned Numbers Authority has assigned Protocol Number 50 to ESP163 (RFC2406). And Protocol Number 51 for AH (Authentication Header for IPv6)164( RFC2402).
ESP uses IP protocol number 50
AH uses IP protocol number 51..
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CertiGuide for Security+ (http://www.CertiGuide.com/secplus/) on CertiGuide.com
Version 1.0 - Version Date: November 15, 2004
Adapted with permission from a work created by Tcat Houser et al.
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