How to get wireless modem to work in conjunction with airport

[doodloo]

I have two macs networked with airport extreme so they can use the same printer. I've just added a wireless modem for internet. When the network is set to the wireless modem, then airport doesn't work, and therefore, the printer can't be accessed. How can I use airport and the modem at the same time?
Thanks.

 

[Darth.Titan]

Is it a cable or DSL modem?

 

[JediMeister]

Can you turn wireless off on the modem? And then maybe set the modem/router or AirPort Extreme to bridge mode...

 

[Hydramus]

I would do what Jedimeister suggested. Connect the airport to your wireless modem, assuming it has ethernet ports, using a cat5 cable. Then set either one of them to bridge mode so that only the other will act as the DHCP server.

Doing this, you won't need to turn off the wireless on either of the routers. As only one of them is serving the IP addresses, you should be able to connect to either one of them and be able to print and access the Internet .