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N600/WNDR3400 connected to a new Cable Modem CM500
Anyone out there know how to get N600/WNDR3400 to work with a new Cable Modem CM500? I've got N600 Ethernet-cabled to the CM500 via the Internet port, but CM500 won't recognize the N600 Wireless ...
Unplug your CM500, then connect the router (WNDR3400 in your case) to the modem also powered down. First power up the router, then the modem. If you still do not get an Internet connection, you will have to log into the WNDR3400 (www.routerlogin.net or 192.168.1.1 -- admin / password is the default when prompted). Go to the "Advanced" section, then look for "Connection Status" button. Click that, a new window will open where you will want to "release" then wait and then "renew." Done. Should work.
Unplug your CM500, then connect the router (WNDR3400 in your case) to the modem also powered down. First power up the router, then the modem. If you still do not get an Internet connection, you will have to log into the WNDR3400 (www.routerlogin.net or 192.168.1.1 -- admin / password is the default when prompted). Go to the "Advanced" section, then look for "Connection Status" button. Click that, a new window will open where you will want to "release" then wait and then "renew." Done. Should work.
Thank you for that. The order of boot up, Router and then Modem with them cabled together, worked! It did not happen right away, it took about 15 minutes really.
The WNDR3400 router doese not have any Connection Status under the Advanced section, which I found surprising. So while I tried other sections just to see if Connection Status would show up another browser window popped up asking to authenticate the Modem with XFinity. This told me it was working since I was hard-wired from laptop to Router.
Advanced 
Wireless Settings Wireless Repeating Function Port Forwarding / Port Triggering WAN Setup LAN Setup QoS Setup Dynamic DNS Static Routes Remote Management UPnP IPv6 Traffic Meter USB Settings Thank you again!
HWEMar