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Topic # 12523 21-Mar-2007 18:22
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I have 2 PAP2T's and one one ip TC cable address.  How can I configure my WRT54G port forwarding to accomodate two private ip addresses with the same udp port range?

The second PAP2T is at the other end of a wireless link, but on the same subnet as the 1st one.
Any ideas?

Thanks
Graeme Woollett


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  Reply # 64555 21-Mar-2007 18:26
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Why do you need to use Port Forwarding at all Graeme?

I have 2 different sites running VFX as their only means of voice communication and I haven't found it necessary to use Port Forwarding at all.

Admittedly, I'm not using TCL at either of those sites (one is Kordia Extend wireless and the other uses Telecom ADSL) so maybe that would have something to do with it.

If you really need Port Forwarding you could have a problem because it is only designed to support a ONE - ONE relationship, rather than ONE - SEVERAL as you are wanting.

If this is the case, I am guessing you would need to find a VoIP device with more than 2 ports.  Maybe Asterisk will be the answer when VFX support for Asterisk comes on line.



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  Reply # 64564 21-Mar-2007 19:17
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From my experience of networking;

>>Why do you need to use Port Forwarding at all Graeme?

>>I have 2 different sites running VFX as their only means of voice communication and I haven't found it necessary to use Port >>Forwarding at all.

If your router is doing NAT+ firewall how does it know where the packets are to go (ie. ip number) on the private network?  How is an  incoming call detected?  I would  understand if the PAP2T polls, but I doubt it does.

>>Admittedly, I'm not using TCL at either of those sites (one is Kordia Extend wireless and the other uses Telecom ADSL) so maybe >>that would have something to do with it.

>>If you really need Port Forwarding you could have a problem because it is only designed to support a ONE - ONE relationship, rather >>than ONE - SEVERAL as you are wanting.

This 1 to 1 relationship is why I'm asking the question.

>>If this is the case, I am guessing you would need to find a VoIP device with more than 2 ports.  Maybe Asterisk will be the answer >>when VFX support for Asterisk comes on line.


Either that or  Xnet might have another port range I can use for the second one...
They didn't seem phased when I told them what I wanted do.

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  Reply # 64567 21-Mar-2007 19:59
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gwoollett: From my experience of networking;

If your router is doing NAT+ firewall how does it know where the packets are to go (ie. ip number) on the private network?  How is an  incoming call detected?  I would  understand if the PAP2T polls, but I doubt it does.

What you are saying is normally 100% correct but the Linksys devices together with VFX's servers implement some pretty clever NAT Traversal techniques (STUN, Keep Alive etc) which make Port Forwarding unnecessary.

I have a copy of the PAP2T Administrator's Manual if you want to read more about it.

gwoollett: This 1 to 1 relationship is why I'm asking the question.

...Either that or  Xnet might have another port range I can use for the second one...

Well it would be a ONE to ONE relationship if WxC have an alternate port range you can use for the second PAP2T.

If they don't, then you will be stuck with trying to forward the same port range to 2 different devices, hence my comments above.

gwoollett: They didn't seem phased when I told them what I wanted do.

I suspect the reason they weren't fazed is because they anticipated that you wouldn't need to do any port forwarding.  With iTalk it was a necessity, and even then I lost many incoming calls.

With VFX, Port Forwarding shouldn't be necessary at all so long as your network is set up correctly.  The main pitfall to avoid is having 2 separate NAT routers on your network, one behind the other.  That will most likely stuff up the NAT Traversal techniques used.  It can easily occur when someone buys a SPA2102 for use together with a multi-port ADSL router.  In your case with a pair of PAP2Ts, I wouldn't expect you should have this problem so long as your TCL Cable Modem doesn't implement NAT.

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