Netgear 6200 Wireless router with Comcast Arris TG862

I have comcast internet and they provided me with an Arris TG862 as a modem/wireless router.
I set it up to broadcast 2G & 5G
LAN side
This works.

Coverage is poor throughout the house so I would like to use a Netgear 6200 + extender.
I configure the 6200 LAN side as
When I connect teh Internet port of the 6200 to the Arris, the 6200 immediately flips to

How do I get the 6200 to connect (cat5) to the Arris and extend the wireless network?  I don't care if the 6200 and the Arris broadcast the same or different wireles network names.
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Davis McCarnOwnerCommented:
When you connected the WAN side of the 6200 configured as you describe, it created a circular loop because they were both in the 182,168,1,xxx range.
With most routers, to work as a secondary, you should set the ip in the range of the primary router, turn off DHCP, connect it using one of the LAN ports, and I will often put a plug in the WAN port to prevent people from using it.  Then it is just another device on the lan which allows wireless and wired connections to the main router.

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Netgear E6200 alone supports wireless-N and gigabit.
hgj1357Author Commented:
rookie mistake on my part.  Thanks!
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