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How to Prevent Checkpoint NAT from Changing Port Mapping

Posted on 2009-06-29
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Last Modified: 2013-11-16
We are looking for a way to configure a Checkpoint R65 based NAT to not periodically change source port mapping for NATted UDP communication.  From network sniffs on the WAN side of the NAT we see that the source port (from the NAT) is incremented by one every few minutes.  Is there a way to disable this behavior such that the source port remains fixed, or to increase the interval at which this occurs.  BTW a static NAT is not an option for security reasons.  Many thanks.
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Question by:dmb17
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deimark earned 500 total points
ID: 24742953
In short, yes you can.

Instead of using automatic NAT rules, ie hide the internal networks behind the external interface, which will use port translation too, you can also create your own manula nat rules where the source port is untranslated.

Be aware though, the automatic nat and port translation do help in most instances and you need be sure that you are not going to break anything by using the manual rules with no port translation.
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