Dynamic IP and Gatekeeper

Hi all,

My company had rent two antek 902 gateway from our supplier, and we had just buy two antek 802 gateway, we suspose to replace supplier’s 902 with our own 802.

We are current running testing on other sites, because the original one is quite business critical, we will replace the gateway after all settings and testing is completed.

Here are our current configuration:

Gatekeeper: Linux Box running Gnugk, behind NAT with a fixed public IP, by port mapping UDP 1718 and 1719 ports.

Gateway 902-1: DMZ behind a Planet’s IP Sharer, Dynamic IP by ADSL w/PPPoE

Gateway 902-2: DMZ behind a Planet’s IP Sharer, Dynamic IP by ADSL w/PPPoE

Gateway 802-1: DMZ behind a Pci’s IP Sharer, Dynamic IP by ADSL w/PPPoE

Gateway 802-2: Port mapping 2000-2015 behind Linux box without H323 kernel module loaded, Dynamic IP by ADSL w/PPPoE

We basically copy all settings from those 902 to 802, but we face some problems in those new 802.

When disabling the Passthrough NAT/Firewall (This is the settings currently using in 902)
I find in the gatekeeper console, It had registered with its private address (and of course could not place call or receive call):
RCF|172.16.10.1:2001|…..

Those 902 are working fine:
RCF|203.198.x.x:1720|…

While enabled Passthrough NAT/Firewall Function in Fixed IP mode, and enter the current IP address.
It will work fine. But of course, it is not feasible.

While enabled Passthrough NAT/Firewall Function in Dynamic IP mode, it require an CDR server to report its public IP to the gateway, Antek do provide a Windows based CDR Server, but our server is running Linux, and I so far couldn’t find an Linux based one. And in fact, the existing 902 work well even without CDR server.

I’m looking for the causes and solutions, I’m thinking of the following reason:

1. Those 802 had a newer and worse way to support NAT behind firewall.

2. Those Planet’s Router had modified the out going H323 packet of those 902 gateway so it could register its public IP to gatekeeper correctly.

Any solutions from you expert?