topic 500/udp - Internet Key in Network Security

ASA

ankit.dhawan — Tue, 12 Mar 2019 08:12:59 GMT

Can we implement ACL for port 500 with TCP? On some sites it is mentioned as both TCP and UDP but never saw any rule with port 500 on TCP. If so then what would be the scenario and use of 500 on TCP?

Hello;

Maykol Rojas — Wed, 31 Aug 2016 21:04:44 GMT

Hello;

For TCP and UDP there is no problem. You can configure an access list with Any Valid TCP/UDP port and apply to the ASA.

Mike.

500/udp - Internet Key

Pawan Raut — Thu, 01 Sep 2016 06:56:04 GMT

500/udp - Internet Key Exchange (IKE)

500/tcp - sometimes used for IKE over TCP

TCP guarantees delivery of data packets on port 500 in the same order in which they were sent. Guaranteed communication over TCP port 500 is the main difference between TCP and UDP. UDP port 500 would not have guaranteed communication as TCP.