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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 192.168.1.1 by default while the Comcast modem/router produces 10.1.10.1 by default.

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

slm
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sparecycle
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  • You have created a [double NAT](http://graemenoble.id.au/post/48695277030/double-nat-explained-and-possible-solutions) situation. See [David's answer](http://serverfault.com/a/551784/32986) for one possible solution. – voretaq7 Nov 11 '13 at 17:34

1 Answers1

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  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.

David Schwartz
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