WET610N with two routers (one is WRT610N and the other is a Comcast Cable modem with router)

[dmiguel]

my old setup was working fine, until i decided to update my modem.  my original setup was simple...

i had an old comcast voice modem talking to a WRT610N router.  the 2.4GHz was for all our wireless equipment.  the 5GHz was assigned to the WET610N bridge only.

the WET610N was connected to a 5 port 10/100 ethernet switch with an ethernet camera, HTPC, and a Wii.

recieved a new Cable Modem from comcast, which has DOCSIS 3.0, 4 10/100/1000 ethernet ports, and voice.  but did not have dual band and wireless ethernet.

i had comcast disable the wifi port, as i wanted to maintain the dual band from my WRT610N router.  i was able to setup the WRT610N to allow the 2.4GHz wireless devices and allow three other ethnernet devices to the WRT610N.

when i configured the WET610N, i used PING on a computer that was connected to the WRT610N router.  i was able to see the bridge, the Wii, the webcam and the PC.  but when i try to connect the Wii or PC to the internet it fails.  i disconnected the bridge and then connected a wired ethernet connection between the remote switch to the WRT610N and i can get internet.  which means it is the bridge i am having issues with.

when i looked in the comcast router, i can see the bridge address, but does not see any of the other devices.  so i think the comcast router can only see the bridge, and unable to route to the other devices.

i don't know if there is a setting in the WRT610N to map the other devices so the comcast router can see it.

there is no way for me to disable the router in the comcast router.  so, for me to use dual band i have to use the comcast router and convert the WRT610N to a switch.

so, does anyone know how i can route this data?  i don't know if there are settings in the router i can configure?  is this an issue with the comcast router?

any help would be appreciated.

thanks,

Don

[peanuts]

Few questions that I would like to ask here.

Here is what i understand from your post. Comcast cable modem/router is acting as a router and sending DHCP addresses to all the devices in the network. Wrt610n is connected to your Comcast modem/router and acting as a switch/AP and serving 5GHz network to your bridge (Wet610n) which is then connected to a switch. Correct me if I missed something.

# What is the IP address of your Comcast modem/router?

# How is Wrt610N connected to Comcast modem/router (LAN port of CC to WAN port of Wrt610n or LAN port of CC to LAN port of Wrt610N)?

# Is your bridge (Wet610n) configured as DHCP or a static IP? If its has a static IP, please ensure the default gateway address on your bridge should be the IP address of Comcast modem/router.

[dmiguel]

Thanks for your response,

yes The comcast modem is sending DHCP addresses to all devices.  The WRT610 is acting like a switch and is serving GHz to The WET610N bridge, and serving GHz to all our other wireless devices.  The WET610N has a simple switch connected to several other devices.

The wifi on The comcast modem/router is turned off, as requested by me.

The comcast router local gateway address is 192.168.1.1, and The IP address is 24.19.249.1.  The new comcast modem/routers do not share all of The information of The box and configuration is limited.

The old router is set for 192.168.1.2 and is connected to The new router via copper cable.  The cable from The comcast router is connected to a non-WAN port on The old router.  I read somewhere in The Cisco forums to connect to routers, The second router can only be connected to a non-WAN port.

I had to turn off DHCP server on The old router, as The new router would provide that service.

The WET610N has a static IP of 192.168.1.97 and The gateway is assigned 192.168.1.1.

Thanks for looking.

[peanuts]

Okay! This shows that the ping request is reaching up to the bridge but not beyond that. Login to your router's web interface and change the values of 'Fragmentation Threshold to 2306' and 'RTS Threshold' to 2307 for 5GHz settings.

You will get these options under the 'advanced wireless settings tab'  which is a sub tab of the 'wireless tab'.

[dmiguel]

well i finally got it all to work.

had to contact comcast to enable bridge mode my modem/router.  which disabled the router portion of the unit.  so i had just one ethernet port connected to my WRT610N.

then i had the WRT610N converted back to a router.  pretty much the way i had it before the new modem.

my network is pretty much the same as it was before the new modem, but now i have a DOCSIS 3.0 modem!

so for anyone who was in the same situation, contact COMCAST to disable wifi and enable bridge.  use only one ethernet port from the modem to your router.  after that, it should all be good.