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Table Of Contents  CertiGuide to Security+
 9  Chapter 2:  Communication Security (Domain 2.0; 20%)
      9  2.1  Remote Access
           9  2.1.7  IPSEC

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IPSec versus DoS Attacks
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2.1.8  Vulnerabilities
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IPSec Interoperability

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 port 1293.

IPSec Ports

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 ESP
163 (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..



 __________________

163. http://www.protocols.com/pbook/tcpip3.htm

164. http://www.iana.org/assignments/protocol-numbers

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IPSec versus DoS Attacks
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2.1.8  Vulnerabilities
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