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Old 02-17-2004, 11:44 PM
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Default Outbound UDP open same port UDP inbound?
Strait forward setup with one dynamic external IP and Masquerading of clients on one internal network. Do outbound UDP packets from internal clients automatically open up the same port number UDP for return packets?

Does this need a packet filter? What should it look like for any outgoing UDP port.

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Old 02-18-2004, 12:36 AM
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Default Re: Outbound UDP open same port UDP inbound?
What are you trying to do here ? Can you give some more information.
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Old 02-18-2004, 02:59 AM
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Default Re: Outbound UDP open same port UDP inbound?
I am setting up VOIP. The two way audio streams transfer on random UDP ports above 1024. During the call setup the two clients negotiate which port to use. Both clients initiate outbound UDP packets at nearly the same time. The outbound packets cause most cheap home NAT routers to open the corresponding port for incoming UDP packets to the internal client.

This is how VOIP providers like Vonage send the RTP packets without requiring the user to set up port forwarding. After a inactivity time-out period the routers will close the incoming UDP ports.

I am just trying to duplicate this feature in the ASL software.


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Old 02-19-2004, 06:28 PM
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Default Re: Outbound UDP open same port UDP inbound?
What about packet filters with triggers? Most Firewalls and NAT routers support these. A trigger packet on one port can be configured to open other ports. Does ALS not support this?
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