2-way comm between 2 routers on 2 Subnets

August 24, 2009 at 00:54:57
Specs: Windows XP, Intel P4 3.0 GHz / 2GB

I'm hoping someone can help me, because this issue has been irritating me for quite some time now. I have two routers, one wireless (Linksys WRT54GS), and the other, a SonicWall Security Appliance TZ170SP. I have computers (wireless/wired) that connect to both of the routers, as well as, a wired network printer that connects to the wireless router. The SonicWall (wired router) is connected to the Internet via a cable modem.

I would like to establish bi-directional communication between the two routers, while maintaining two separate networks, on two separate subnets. I have read many posts regarding similar situations, which all seem to advise connecting the LAN port of one router to the LAN port of the other router (not the WAN port on the second router). When I do this, I lose my internet connection on the wireless router. Most of these scenarios also involve simulating a switched environment on the second router, which would eliminate the possibility of having two separate networks.

Similar scenarios to what I'm trying to accomplish are setup in virtually every enterprise environment. I'm not sure if the fact that I'm using a SOHO (Linksys) router precludes the possibility of accomplishing my goal.

I have setup a website, http://www.interwerks.net/routing that maps out my environment in detail. On this website, you will find screenshots of the various pages of the Management Interfaces that I believe would apply to troubleshooting this issue. I have also included more details about what I am trying to accomplish. The site is resident in a password-protected directory. Please use the following credentials to access this resource.

Username: anon
Password: l3tm31n

Thanks in advance to anyone that attempts to assist me with this. Your help is much appreciated. Regardless of whether or not you can help me resolve this issue, I appreciate the input.


See More: 2-way comm between 2 routers on 2 Subnets

Report •

August 24, 2009 at 08:07:08
"I would like to establish bi-directional communication between the two routers, while maintaining two separate networks, on two separate subnets."

You are already doing this if the devices connected to the linksys router are getting internet from the sonicwall.

So what if you can't ping or reach the other subnet since this is what you want according to this: "maintaining two separate networks".

Do you want comm between or not?

Report •

August 24, 2009 at 11:11:13
The only aspect that is working is the internet connection, which would lead one to believe that there is bidirectional communication on the Linksys side, however, you are unable to reach a specific host on either network, from a host located on the other network.

Additionally, you are unable to reach the management interface (MI) of the router located on the adjacent network, even though you are able to ping the router.

Example>>> From the SonicWall network, you are able to ping the linksys router, but unable to access the MI. From the Linksys network, you are UNable to ping the SonicWall router, and you are unable to reach its MI.<<<

When I referred to maintaining two separate networks, I was referring to having network and network (both with different subnets). Ultimately, I would like to selectively enable bi-directional communication (via firewall rules) between the two networks. This approach adds an additional level of security to the hosts located on the SonicWall network, as only specific hosts on the Linksys network will be able to communicate with hosts on the SonicWall network.

Report •

August 24, 2009 at 11:52:15
You would need to create a rule in the sonicwall that allows admin access from the linksys subnet.

To reach the linksys subnet from the sonicwall subnet there would need to be a route add in the sonicwall saying direct that traffic to the linksys subnet.

I am assuming the sonicwall has multiple lan interfaces or you can't do the route add. The route add would have to be on the sonicwall subnet pcs otherwise.

Report •

Related Solutions

Ask Question