ADSL disconnecting when running through Sonicwall firewall

July 16, 2012 at 04:50:09
Specs: Windows 7, NA
Hi,

We currently have a Netgear router connected to our ADSL line. A Sonicwall firewall is giving DHCP and is connected to the router which is connected to a switch respectively so all users traffic goes via the firewall before hitting the internet. The firewall is also configured as a VPN back to our head office firewall giving us LAN / WAN access.

Using this setup, we get internet, LAN / WAN access etc with no problems, however intermittently after anywhere between 15mins - 1 hour the ADSL will disconnect and the router and firewall needs to rebooted to get it back up and running ...

I have now taken the Sonicwall firewall out of the equasion (so it's just a standard ADSL connection and router) and the connection stays up fine! As soon as the firewall is added into the loop again the intermittent disconnects start happening!

Any ideas?

Thanks in advance.
Rob.


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#1
July 16, 2012 at 08:04:14
a more reliable test would be to during the outage plug a laptop into the netgear.
does it have internet when the sonicwall doesn't?

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#2
July 16, 2012 at 10:55:43
Hi Wanderer, I understand where you are coming from, however:

The Netgear is configured to work with the firewall so if anything is plugged directly into the router you won't get internet access anyway. DHCP is controlled from the firewall. To do this I would need to change the router config when the drop occurs, resulting in a reboot which resolves the problem anyway. It's worth noting, without the firewall in the loop the ADSL line hasn't dropped all day so it's definitely firewall related.

I will be changing the firewall tomorrow to see if that resolves the situation but will let you know how I get on ...


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#3
July 16, 2012 at 15:41:30
"The Netgear is configured to work with the firewall "

No its not. You just disabled its dhcp server. All you have to do to test is assign the laptop a ip in that routers subnet.

Point of the test was compatibility between the two routers. Question is when the sonicwall goes out did it also take the main router with it. Or visa versa.

Now we won't know.

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