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Linksys Router -- I want one subnet within another

A

Alphathree33

Platinum Member
Situation:

Top Level:
WAN (Cable Modem)

Next Level:
Linksys Router serving three computers and another router

Next Level:
Aforementioned "other" router servicing two computers

Now, that last router gets assigned a DHCP address and also successfully delivers DHCP addresses to the two computers it can see, but it fails to provide them with internet access.

What have I done wrong? Shouldn't the lower level router simply think that the upper level router is any old internet terminal, even though it's really another router?

My computers get fooled into thinking they have a normal internet connection when they get assigned a DHCP address, so why can't I also fool a router by assigning it a DHCP address?

Really, how am I supposed to set this up? *I DO NOT WANT TO UPLINK* that would expose my network to the rest of the network. I want it protected from my roommates. I really do want my own network within the network.
 
When you do such an arrangement your second Router need to be able to be configured to a private IP on the WAN Side, some Routers can not do it.

If your Router can be configured with private WAN, make sure that the LAN?s DHCP of the second Router is on a different subnet than the first Router.

:sun:

 
Originally posted by: JackMDS
When you do such an arrangement your second Router need to be able to be configured to a private IP on the WAN Side, some Routers can not do it.

If your Router can be configured with private WAN, make sure that the LAN?s DHCP of the second Router is on a different subnet than the first Router.

:sun:
Click to expand...
That is called NAT

You will more than likely need a unix based machine to do such routing. That is the key to that ROUTING. You can keep subnet seperate with the same setup, which is very nice at times. By switching my IP one time, I go from 192.168.0 subnet to 10. subnet....
 
The issue is likely that the first router is using the same address range as the second router. Routers CANNOT route to the same network address block.

You need to manually edit the DHCP range of the second router's LAN to a different address block (or turn off DHCP server and manually assign them form a different block).

If the first router is handing out 192.168.1.0 255.255.255.0, then set your second router's LAN block to something like 192.168.100.0 255.255.255.0. (note the change of the third octet).

Good Luck

Scott
 
I had a similar issue for a bit when using a 2 router setup. When first configured, everything was working great. After a power outage, everything stopped working correctly. The only way I was able to fix it was to disable the "firewall" settings on the second router, but keep NAT running. Of course, I was using 2 completely different subnets too. Now, this has been working flawlessly for maybe a year.
 
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