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I have a Linksys WRT54GL router with Tomato installed on it.

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My network configuration requires me to disable the DHCP server on the router. After disabling it, I do not know the IP of the router because it isn't my default gateway anymore. Now it is impossible to change settings (e.g. wireless password).

Any idea how to access the router?

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2 Answers

DHCP server does not necessarily mean default gateway.

If you are not using the DHCP server on your router, you need to either

  • set up another DHCP server on another computer or something else somewhere
  • assign IPs manually to all devices

Clients reach the DHCP server through broadcasts, i.e. traffic that is set to reach all nodes on your network. So nothing needs to know the IP of your DHCP server as long as the DHCP server is listening on something that is in the same subnet as the rest of your network.

Your DHCP server should be configured to hand out the router's IP as the default gateway.

Per your situation, if all you did was disable the DHCP server, the IP of the router probably didn't change and you can still use the same IP to get to it. If you do NOT have a DHCP server elsewhere on your network, try setting your IP to 192.168.X.44 subnet mask 255.255.255.0 - X is probably going to be 0 or 1 - then you can probably reach your router at 192.168.X.1 or 192.168.X.254.

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I don;t have access to the DHCP server; How do I know the IP of the router? –  Adam Matan Mar 10 '12 at 15:35
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Just made an edit. It probably didn't change from the last time you set it. Typical default IPs of routers are 192.168.0.1, 192.168.0.254 , 192.168.1.1, 192.168.1.254. –  ultrasawblade Mar 10 '12 at 16:10
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You're still able to connect to the router that this is connected to, and serves as your DHCP, right? That might be able to have a list of connected devices. If not, you would at least know the base range of ip ranges (192.168.0.* or 192.168.1.*). If you know roughly how many other devices are connected, you could guess the address from there. Or reset that dhcp router, connect with some pc and find its ip address. Then connect the new dhcp-less router, and its ip will be +1 of the last known address.

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