Problem communicating between two subnets

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cpfman

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Sep 7, 2012
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Hello. I am hoping someone can help me solve a router issue I am having. Currently I am attempting to connect two subnets together in my company using a Linksys WRT54GL router flashed with DD-WRT firmware (great firmware which I have used with much success with Linksys WRT54GL routers). The main large network (with Internet access) is 192.168.10.x and the much smaller subnet is 192.168.11.x I have connected the 192.168.10.x side to the WAN input and the 192.168.11.x to one of the LAN ports. I have configured the WAN side in the Linksys router to an IP of 192.168.10.4, subnet 255.255.255.0 and gateway 192.168.10.1 (which is the IP of the router to the Internet on the 192.168.10.x side) I configured the LAN side of the router to a 192.168.11.x network, with the ports on the LAN side of the router appearing as 192.168.11.1, subnet 255.255.255.0, gateway 192.168.11.1 DHCP is enabled. All firewalls are turned off. No port forwarding. The situation is this: If I use a computer on the smaller 192.168.11.x side to ping any computer on the larger 192.168.10.x side, I can ping successfully, and I can also get to the Internet just fine. But if I use a computer on the 192.168.10.x side to ping a computer on the 192.168.11.x, I get nothing. Communication appears to go fine when originating on the smaller 192.168.11.x side to the larger 192.168.10.x side, but not the other way around.

I must be missing something. I am quite familiar with networking but for the life of me I am having a hard time figuring out what I must have missed. Can someone give me some advice on this? I would really appreciate it. Thanks!
 

ngrego

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Jan 25, 2012
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Using two different VLANs on a network is usually done to prevent one network from being able to communicate with the other. If that is the reason you have set your network up with two VLANs then you have succeeded, but it doesn't seem to be what you are expecting. In large scale networks a Core level switch would be used to allow access from one VLAN to another but I'm not sure if that is possible using WRTs.
 

cpfman

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Sep 7, 2012
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Thanks, and I understand that, but I am working with VLANS but rather just want to communicate between two subnets. I need to be able to talk back and forth between the 192.168.10.x and 192.168.11.x physical networks. Since a router must be between them, I just was trying to find out what settings I am missing that allow me to communicate both ways.
 

ngrego

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The two "physical networks" are on two different vlans though... One is on vlan 10 and the other on vlan 11. When setting up a network with different address ranges you are putting them on different vlans, that is usually done to prevent access from one to the other. In the network you have set up there is one router issuing 192.168.10.x addresses to one network and another issuing 192.168.11.x address to its network. One of the two is connected to the internet and also to the other lan.
For this to work correctly, there should be a Core level switch at the top of the network wich will do the "bridging" between the two lans and the wan.
I don't think that this kind of job can be done with a simple WRT.
 
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