problems with draytek vigor 2820
Posted on 2009-12-23
I have two separate adsl lines each with a draytek vigor 2820.
One has been used for production for about 18 months with a mixture of microsoft and linux servers and nortel phone VOIP system. The second one was installed 6 months ago and has been used for testing devices external to the network so they can contact internal services from outside.
There is a Centos linux server running an apache website. External GPRS devices send data to it and require port 80 to be pointed at the linux server. The newly installed nortel system apparently also requires port 80 for external phones to connect on. I'm told this can't be changed.
As a solution the second draytek 2820 was connected to the internal switch. On an internal PC I can connect to the admin pages of both drayteks and have compared the settings. The second router can see the ARP table on the first router, the NAT table on the second router shows external connection attempts as they happen, but I cannot connect to any internal device through the IP of the second router. The first router is fine for remote desktop, web services, and I can connect to the management screen of the Nortel switch using port redirection on 8081. The intention was that external Nortel phones will connect to port 80 on the IP of the second router.
I am able to connect to the draytek management screens from outside on the second line using port 8081. I have been able to telnet through to one of the servers and can SSH to the router. But it has not been possible to get past the router/firewall to the servers I need to access.
I have compared the firewalls, open ports and port redirection line by line. Nothing seems to be incorrect. I'v not yet tried resetting the second router to default and starting again but I suppose that may be a solution. Both routers are at the same firmware revision (3.3.0 which is Nov 2008)