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Joined: Feb 22, 2007
Posts: 11
Location: Pueblo, Colo.

PostPosted: Fri Mar 30, 2007 5:34 pm    Post subject: VT2142 Setup Issues Behind Firewall. Reply with quote Back to top

Hello everyone.

I got a weird one for you all, but first I'll just start out with my config.
I've got my Tests pasted below for your information as well.

I'm using Fedora Core 6 I686 2.6.18-1.2798.fc6-xen as a small network firewall supporting about five computers, including the Vonage Device.

I'm using the standard distro, and i'm using shorewall and WEBMIN to manipulate the firewall.

I really want to put the Voip device behind the firewall. It will work, but my phone calls are choppy, I have packet loss, and I cannot see the web interface if one plugs it from the WAN side.

Here's the Really Weird part:
The device works from inside the firewall, but my DHCP server does not register the device with an IP!

It's stock config, I've done nothing to the Vonage Device other than take it out of the shipping container and plug it up.

When the Vonage Device is between the firewall and the Cable Modem, It screams! (Speed tests below!)

I cannot see the Vonage Devices config page unless i use it as a pass thru device.

I know, your going to tell me that it's the Firewall causing issues.
I will agree. However, the firewall is currently acting ONLY as a nat router, I have no rules blocking ports, and the other systems behind it are rock steady.

I have the latest Packages on the firewall, I have DNS & DHCP running, and the other systems seem to be happy!

P2P (Azureus) has no issues, and I get just as good speeds and no packet loss thru the firewall according to Broadband reports!

What i would like to do, is setup the Vonage Device where:

A) I set the WAN To a pick up the DHCP from my Server.
B) I want to be able to see the router's config page from inside my
network, not using the passthru on the Vonage Device.
C) I want to setup the QOS thu the firewall, rather than the Vonage

Can some one please tell me what I'm doing wrong!

For a Hub I'm using a stock 3com SuperStack II 3000 Switch

I'm using a RCA Thompson Cable Modem via Comcast.
Model: DCM315 , Software Version: ST32.0A.00
Software Model: A801, Bootloader: 2.1.4c

Cable Modem Stats:
Cable Signal Details
Forward Path: Return Path:
Signal Acquired at 543.000 MHz Connection: Acquired
SNR: 36.0 dB Frequency: 21.0 MHz
Received Signal Strength: 2.5 dBmV Power Level: 42.3 dBmV
Micro-Reflections: 33 dBc Channel ID: 8
Modulation: 256 QAM Modulation: 16 QAM

Provisioning Rates:
Inbound is at 6 Mbps (Speed Boot Disabled)
outbound is at 768K

Speed test statistics
Download speed: 4861264 bps
Upload speed: 1305896 bps
Quality of service: 74 %
Download test type: socket
Upload test type: socket
Maximum download pause: 180 ms
Average download pause: 4 ms
Minimum round trip time to server: 95 ms
Average round trip time to server: 96 ms

Voip test statistics
Jitter: you --> server: 7.8 ms
Jitter: server --> you: 11.1 ms
Packet loss: you --> server: 0.4 %
Packet loss: server --> you: 0.0 %
Packet discards: 0.0 %
Packets out of order: 0.0 %
Number of supported Voip lines: 22
Estimated MOS score: 3.7

Vonage Device Information:
Model Number VT2142
HW Revision 1
Serial Number 16445863152887150101XXXX
Ethernet MAC 00:18:C0:59:XX:XX
Software Versions
Gateway 11.4.1-r070201-1.3.2 -r1
Boot Loader
***************** You will see XXXX Above, To Protect the Privacy *****
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Vonage Forum Associate
Vonage Forum Associate

Joined: Feb 22, 2007
Posts: 11
Location: Pueblo, Colo.

PostPosted: Fri Mar 30, 2007 5:44 pm    Post subject: Reply with quote Back to top

Oh, Let me add.

Im thinking part of my problem has to do with the fact that the Vonage device is not auto sensing the cable.

A good example was i tried to put it behind the fire wall, but in front of the switch. It didn't like that.. It wanted a cross-over cable...
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New Forum Member

Joined: Mar 17, 2007
Posts: 5

PostPosted: Fri Mar 30, 2007 7:47 pm    Post subject: Reply with quote Back to top

From the sounds of it the adapter must be getting its IP from somewhere if it is working. I would check to see what IP it has and if it is in the range that your DHCP is assigning. If it does then I have no idea why it is not showing. When I received mine it was set to DHCP by default.

In order to access it from the WAN side you need to go to the Advanced tab and then click on "Remote Web Access" and put in the required info. Then you should be able to access it from the rest of your network.

As far as the QOS, I am not the one to help with that, sorry.

To address the auto sensing issue the WAN port does not do that. If you are coming from a NIC on your firewall then you would need a cross over cable. The only other way around that would be to plug the cable from the firewall to one of the 4 LAN ports (lets say #1) then connect another cable between one of the other LAN ports (lets say #2) and plug that into the WAN port. You would also need to disable DHCP on the adapter. If you did it this way it would also address issue "B" without turning on Remote Web Access.
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