Does nat work for ip phones in the following situation that I have:
ip phone has a public address, ccm has a nonpublic address.
Router is the 4224 gateway, using ios 12.1(5)YD.
I cannot nat a direct, static, public-ip-to-private-ip. (But I can nat single static ip-to-ip tcp or udp ports). There is only one external ip address. The internal LAN, with private ips, is using nat with overloading.
The TFTP server is on the ccm.
I have tried the command suggested in the document at:
I believe the ccm is using port 2000, according to the debug packet details results on the 4224.
The issue I have come against is that the phone cannot get it's load from the tftp server (the internal ccm). It makes a request to udp port 69 on the router. I natted that port to the ccm. However, to continue the tftp session after acknowledging the tftp server on port 69 the phone makes requests to the tftp server using a pool of ports in the 3000-4000 range. It's not practical to enter nat commands for all those ports.
This is as far as I have gone. Is there a way nat a range of external ports to an internal ip address, given these conditions? Or am I off track?
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