How to access a Bridge mode Linksys router on with Airport Extreme

I would need help. I am having issues trying to access a Liksys router that is connected (wired) to my Airport Extreme.

The Linksys router is configured in Bridge mode and does not provide DHCP service. I installed my Airport Extreme in 802.11n (5mhrz), i kept my Linksys to continue to provide the 802.11g service, everything works fine except that I want to add another device in my allowed MAC list on my 802.11g Linksys router.

My problem is that I can not connect directly into the Linksys router anymore. I have my password but obviously the 192.168.0.1 does not permit me to access the router anymore. I can not seem to find the IP address of the Linksys router anymore. One of my MAC is connected (wired) in it, it works fine, I have an IP address and the gateway address is my Airport Extreme one, which is what I want. I cant figure out a way to find the address of the Linksys router.

I know that I can do a reset and start all over again, but I would like to avoid configuring it again.

Thanks