How to connect multiple subnets using RV042 router

175 pts.
Tags:
LAN port
Linksys Routers
Hi all, I'm trying to figure out a way to get multiple subnets to communicate. Here's the scenario:

2 subnets - 192.168.101.x and 192.168.104.x

1. Router - Linksys RV042. WAN 1 port to internet, LAN port to internal network. Default Gateway with IP of 192.168.101.253. The WAN2/DMZ port is not being used currently.
2. The router connects to 2 unmanaged switches, which are simply acting as open ports to provide connectivity.
3. Multiple PC's, printers etc. connect to the switches. All are on the 192.168.101.x subnet.
4. Cisco SGE2010P managed switch. Not configured yet, so it's simply forwarding all traffic.
5. Win 2003 server - This server has 2 NIC's in it. The first is configured for the 192.168.101.x subnet, the second is configured for the 192.168.104.x subnet.
5. VOIP System - The voip system has a server (ip 192.168.104.2) and another device (192.168.104.3). They currently connect to the SGE2010P switch, and there is a link cable going from that switch to one of the unmanaged switches. The voip system also has a management tool that's installed on the win 2003 server - it connects to the second nic via the 192.168.104.x subnet.

So, my issue and what I've been racking my brain trying to figure out is simple....how do I get the two subnets to talk to each other??

Here's what I've tried so far:
1. Create a VLAN on the managed switch, and move all of the voip ports on the 192.168.104.x subnet to it. The problem here is that I can't find a way to trunk to the RV042 router. I'm not even sure if it supports trunking....can I use the DMZ port for the trunk? I doubt it.
2. I tried enabling RRAS on the win 2k3 server. My thought was that this could act as my second router between the subnets. I enabled RIP on it to point to both subnets, and there are static routes to each network. Again, the problem comes back to the RV042.....I can enable RIP on it, but it doesn't allow me to point it to any specific networks. I can add static routes apparently, but it will force me to disable dhcp which I don't want to do.

I'm stuck at this point, so any suggestions or help would be greatly appreciated!

Thanks all,
Lordhowe

Software/Hardware used:
Linksys RV042
ASKED: May 19, 2012  1:01 PM
UPDATED: April 2, 2014  9:52 PM

Answer Wiki

Thanks. We'll let you know when a new response is added.

When you use private addressing, packets are non-routable. That is the whole point; they do not ‘escape into the wild,’ of the internet.

How to overcome that obstacle? You need to assign default routes so a packet striking the router going to an IP address ending in .104.x hits the router, the router knows which port to send it to. When you have assigned the default route, you have to assign that default route to every interface that isn’t the default interface for that subnet.

Ditto for the .101.x side.

You need to assign an appropriate IP address to each interface so it is part of the assigned subnet:

http://www.cisco.com/en/US/docs/ios/12_1/iproute/command/reference/1rdipadr.html#wp1017863

You have to turn on routing:

http://www.cisco.com/en/US/docs/ios/12_1/iproute/command/reference/1rdipadr.html#wp1020435

Very helpful to your cause is to see the status of the Ip interface:

http://www.cisco.com/en/US/docs/ios/12_1/iproute/command/reference/1rdipadr.html#wp1020814

Let us know how you make out.

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  • Santucci44
    You should have an Ethernet connection connected to one of the FA ports on the Cisco SGE2010P and the other end connected to your linksys lan port. If you connected the patch cable to lets say fa 0/48 on the cisco switch, then you need to make sure you turn it into a routed switch port by initiating the " No Switchport" command in interface configuration mode. Once you do that, you need to assign it an IP Address from the subnet of the Linksys Router which is your 192.168.101.X subnet. You'll need to first find out which address aren't in the dhcp pool, so when you look in your Linksys router, find out where the dhcp pool address start from and anything under the start number is all excluded from dhcp. So, for kicks and giggles, lets say that you look inside your Linksys Router and it says that you allow 100 dhcp clients and the addresses start from 192.168.101.100, then 192.168.101.1 to 192.168.101.99 are all set aside for static addressing. Assuming this is the scenario, I would assign any number you have available to the FA 0/48 port. So, let's again say that you have 192.168.101.10 available, go into your FA 0/48, and put in " IP Address 192.168.101.10 255.255.255.0" Make sure you do a No Shut. then on your Linksys, put a static route for the other subnet by typing, 192.168.104.0 255.255.255.0 192.168.101.10. On the cicso switch, make sure you use a default static route to get out to the internet by using 0.0.0.0 0.0.0.0 192.168.101.253 I don't think I forgot anything; but hit me up if this doesn't work.
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  • Lordhowe
    Hi Santucci44, Thanks for the reply! There is one issue i see with your answer though, and that is that the RV042 won't allow you to create static routes as long as dhcp is enabled. I don't want to disable dhcp (mainly because I don't want to have to create static ip's for every device in our office), so, I'm still not sure how to proceed. Thanks, Lordhowe
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  • Santucci44
    Lordhowe, Yes you can. I'm telling you to put in a static route to another network subnet which has nothing to do with the dhcp being enabled or disabled. Please review page 18 of your manual, which is advanced routing section. But you must make sure that you give your switch a routed port and ip address of the 192.168.101.x subnet like mentioned in my other instructions. I have setup clients like this before and it works with 10 different subnets/vlans. you could also have multiple dhcp servers running, one on the switch and one on the linksys. Just make sure you created the vlan interfaces.
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  • Lordhowe
    Ahhh...I see it now, thanks! In the instructions on the actual router, it says explicitly "You can not create static routes if you have dhcp enabled!" so I'm not sure why the disconnect with the manual :/ Anyway, I'll give it a try in the morning and let you know how it goes, thanks again! Lordhowe
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  • Lordhowe
    Just an update to this, the static route worked just fine. I'm annoyed at the help section on the RV042 for indicating I couldn't use a static route with dhcp, but glad that helpful people (like Santucci44) are around to give some proper information :) Thanks again for the help, Lordhowe
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  • Santucci44
    I'm glad that everything worked out for you, and I am glad that I could help. Take care bud.
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