Stun server and NAT

Unanswered Question
Apr 10th, 2008

I need to operate a public stun server for voice. I want to put it on the dmz and then static nat public ip's to its internal ip addresses. It needs to respond on its publc interface however it is failing because of the natting.

I have this problem too.
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htarra Wed, 04/16/2008 - 13:15

Refer to the ATA 186/188 administrator guide for information on STUN support.

Cisco devices use a different method to avoid having to use STUN in the first place, using the VIA: option so they can

register correctly with the SIP server. You'd configure this per this doc on the ATA:

Look under "receiver tagged VIA header"

To maintain NAT/PAT translation for a session, the Cisco ATA 186 can now be configured to periodically send dummy UDP packets to a server (the Cisco ATA 186 does not expect any response from the server).

Here's some NAT related information that may help you with your situation:

(see "NAT Gateway" and "NAT/PAT Translation" )


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