how to hook up router

First disable DHCP on the AC2200

Then connect a LAN port on the AC1200 to a LAN port on the AC2200.

It's depend if you want to
1. have only internet access from all computers or
2. also you want all them to be in same subnet and see each other.

If 1 then just connect WAN port of AC1200 to LAN AC2200  - if AC2200 will be connected to Modem, then all computers will have internet access

If 2 and you want to keep your current settings, then you must first log on to AC2200 and disable DHCP. Set penmanent IP on LAN to have access to this router in future, then connect LAN port AC1200 with LAN AC2200 and WAN AC1200 to modem.

Your old AC1200 still will have DHCP ON so will propagate local IP's and AC1200 will still be your GATEWAY

For everything on one subnet, I use Don's method above. I also give the second router a static IP address on the network so it does not get lost in a network restart.

I use Tom's method in some places for simple guest wireless.  That works also

If your goal is simply to expand wireless coverage, then I would get powerline adapters and some access points (Ubiquiti are a relatively low price point for the APs). Cleaner than continually connecting additional routers.

Don's advice will give you all the computers on the same subnet an will simplify local file sharing.  That's Tom's #2.

Tom's #1 may be the easiest to do (but I'm not sure - see below) and will result in two subnets - but internet access will be there.
If anyone is gaming and using port forwarding then they would best be on the old router.
You need to make sure that the LAN subnets are different.
This may require changing the new one before you put it into use.
So, if one is 192.168.1.0  then the other could be anything else like 192.168.0.0 or 10.1.1.0 or .....
AND should be different from the modem/router LAN subnet as well.

It used to be that the ISP private subnets were typically 192.168.0.0 or 192.168.1.0 or 192.168.254.0 and maybe a couple of others.
So, it really can help if your subnets are different from that - planning ahead for when your ISP changes.
I normally use "odd" ranges like 192.168.97.0 or 192.168.222.0, etc.
But, it appears that these days the ISPs are doing the same thing.  Even so, having an odd subnet range leaves less chance of a match.

guys I don’t know what I’m doing wrong but I connected the LAN on old to new and i am getting internet access ....

however I can’t seem to get the router page to change settings....I keep loggin on to the  old router

Hook up an Ethernet cable from a computer to a router (you have 2) LAN side, then set your computer LAN settings for the login IP address of the router.  You may need to set your computer for a static IP address. You should then be able to log in to the router.

I can use any router ?? it’s the second router I want to change network name and password etc in

You can hook up from your computer to the LAN port of the router you need to with the IP address of that router

If you have the LANs connected together as Tom's #2 then.
Any way, each router will have an IP address to reach its settings interface.
Presumably that's the original one for the old router.
What is it for the new router?
If the new router had a default address that's different than the old router then you would use that address to reach it with a computer set up in that same subnet.
If the new router had a default address that's the same than the old router then you have an address conflict perhaps - assuming that they are both at xxx.xxx.xxx.1.

All the new router is doing on the network is acting like a switch and, perhaps, wireless access point.
As long as DHCP is turned off then it doesn't really matter what the IP address is to access it unless, well, you need to access it.

The easiest thing to do is to turn off DHCP on the new router as before, AND give it an IP address on the LAN side that's somewhere inside the old router's subnet.  If the old router is 192.168.1.1 then an unused address that might be 192.168.1.239 - just one that won't be used and is outside the old router's DHCP range of addresses.

THEN you can always access each router at their respective addresses.

sorry but just guide me how to get into the new ac2200 settings cause I tried connecting it to a computer via Ethernet but still not able to get into the settings

Open a browser and type in the IP address of the router    http://192.168.1.1 for example

I am not getting an IP address when I run ipconfig

I mean default gateway showing blank

From the Linksys manual

"Follow the on-screen instructions to complete your router setup. You also can type 192.168.1.1 in a browser to start setup. At the end of setup, follow the on-screen instructions to set up your Linksys Smart Wi-Fi account. Use Linksys Smart Wi-Fi to configure your router from any computer with an internet connection."

It is 192.168.1.1

http://downloads.linksys.com/downloads/userguide/EA8300_UG_International.pdf

the ac1200 is 192.168.1.1

So also is the 2200.

ok I turned off the old router and I only have the new connected and when I type in the 192 it asking me to login to Linksys smart WiFi

Try the entire address;   http://192.168.1.1

You may need to set your computer LAN network to STATIC IP at 192.168.1.1

Another option for you and possibly a lot easier is to simply replace the old router with the new router and just use one router. That is what the majority of home users do.

You didnt have an area that said "access router" and have a password field? That is how you can login without a smart wifi password.

yes mansrock but when I trying to put in a password it not working

Brian, I've explained you before,,
Change permanent IP on second router before you'll disable DHCP to have access to it..
Please read my suggestion I've placed before

Which did you try as the password? The default is usually admin

@Tom - Nobody is dismissing your suggestion. However, if the author can't log into the router, there's no way to configure it.

He can't log on because he have disabled DHCP and did not register IP address that was assigned to Router.

Now the best idea is to connect some laptop or other computer directly to new router, disconnect it from old one,,, reset to factory default,,, then  log-on to new router,,,, assign IP from his network,,,,from out of DHCP scope ( for example) if his DHCP scope has setting from 192.168.1.100 - 192.168.1.200 then I would assigned 192.168.1.254 IP for new router - if wasn't used before,,, then disabled DHCP on new router.

From now he can connect both routers using LAN connection and both routers will be accessible from network.
It will be good to make a note or put label on new router, what IP was assign to it for future access.

Tom should I turn off the old ac1200 when I am about to do those steps mentioned above ??

No, just disconnect it from Old one and reset

For the time being, unhook the old router and just deal with one

This diagram addresses what you're trying to accomplish.
Wireless-Router-as-a-Simple-Switch-a.pdf

ok Fred I think I got through with your suggestions ....didn’t follow it exactly eg setting computer IP address cause I was having trouble figuring out how to do that ......but I am able to log in to both routers now ...... the old is 192.168.1.1 and the new is 192.168.1.244 as you suggested. however I noticed on this new tri band router is only 1 ssd showing which is shanks.....the old one would have eg shanks and shanks 5ghz

I guess these newer smart routers different

The wireless settings normally do not affect the way the routers connect.  Wireless comes later and for setup for your devices,

AC2200 Manual:http://downloads.linksys.com/downloads/userguide/EA8300_UG_International.pdf
I see the names (SSIDs) under
Connectivity / Basic / Network Name and Password | Edit
and
Wireless / Network Name

thanks a lot guys