I know this is going to seem like a simple solution but I have been unable to find a clear answer through Google.

Simple office setup: I have a Comcast modem/router that has 4 hard wired ports. In one of those ports I have a Cisco wireless router which also has 4 of its own ports. What is the method for getting devices behind the modem/router to ping/communicate with devices behind the wireless router?

They are all on the same subnet but the IP ranges differ. The router produces by default while the Comcast modem/router produces by default.

I think what I'm attempting to do might be considered "extending" the modem/router's network but I'm not sure.

closed as off-topic by Falcon Momot, Ward, Dave M, colealtdelete, Dennis Kaarsemaker Nov 11 '13 at 21:56

This question appears to be off-topic. The users who voted to close gave this specific reason:

  • "Questions must be relevant to professional system administration. Server Fault is dedicated to professional system and network administrators. End user and enthusiast questions are off-topic (contact your system administrator or hire a professional to help you out). Please see the Help Center for more information." – Falcon Momot, Ward, Dave M, colealtdelete, Dennis Kaarsemaker
If this question can be reworded to fit the rules in the help center, please edit the question.

  1. Log into the wireless router and disable its DHCP server.

  2. Connect the wireless router to one of the cable modem/router's LAN ports.

  3. Do not use the wireless router's Internet/WAN port. (It's not connected to the Internet, it's connected to the LAN.)

You now have one big happy LAN produced by the Comcast modem/router. You may need to reboot devices connected to the wireless router to get them to request new IP addresses from the modem/router.

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