Two routers

Hello, Pleasehelpme3! Thank you for posting in our community! We don't recommend to use two routers and we can't really help with the setup. Are you having issues with the WiFi coverage? 

What it sounds like you need is something like an access point.  You can try something like a ubiquiti unifi ap.

How do I "post publicly"? Thanks for any info.

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@Pleasehelpme3 wrote:

How do I "post publicly"? Thanks for any info.

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Are you talking about posting a pic / pics ?

Not particularly, I'm just trying to learn my way around and get an answer. One reply asked that I "post publicly". What does that mean, and how do I do it? I cannot find any such reference in the help topics.

Thanks for any info.

PS, as to my original request, it doesn't seem impossible, and I'm looking for the answer to longer reference post I included, which had a reply in a private message, rather than a public post. I'm confused.

@Pleasehelpme3 - You already posted publicly by creating this thread. If you would like to purchase a second IP address - I can check if we offer this feature in your area. We offer the second IP in some areas but we can't assist with setting up your personal equipment (except modem). I see that you already sent us a private message and I will reply back in a second. Thank you!

How do I reply to a private message? This is so confusing. I just want Wifi in a detached building and now I'm lost in these forums.  Thanks for any info.

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@CCElla wrote:

@Pleasehelpme3 - You already posted publicly by creating this thread. If you would like to purchase a second IP address - I can check if we offer this feature in your area. We offer the second IP in some areas but we can't assist with setting up your personal equipment (except modem). I see that you already sent us a private message and I will reply back in a second. Thank you!

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Read my first post.  YOU DON'T NEED A SECOND IP ADDRESS IF ALL YOU WANT IS WIFI IN ANOTHER AREA.  There's no point in purchasing a second IP or racking your mind with trying to figure that out.  ALL YOU NEED IS AN ACCESS POINT  Something like this

Thanks - but what did Dickydck do in the post I referenced above? I'm just trying to figure out how all this works.

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@darkangelic wrote:

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1. Upgrade your SB6183 modem to one that has two or more ethernet ports to allow for configuration of a separate IP address into a separate router. (E.G. ARRIS SB8200,  Netgear CM1100, Motorola MB8600. .

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FWIW, can't an ethernet switch be used with any single port cable modem for port expansion purposes (with an additional public IP addy of course)  ?

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@Pleasehelpme3 wrote:

Thanks - but what did Dickydck do in the post I referenced above? I'm just trying to figure out how all this works.

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SInce I was involved in that thread- 

Each modem on a consumer account is typically assigned one public IP (IPv4) address.. What that particular user wanted was to have a second one for their modem so that they can run a separate public connection to the internet with a separate IP address from the same modem. 

Since you stated that you wanted a separate WIFI connection on a separate router, presumably with a separate IPv4 address to a detached building as stated here:

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@Pleasehelpme3 wrote:

How do we use two routers with one modem? We want a second, separate router in a detached garage/ADU building, 50 feet from our house. It is connected by ethernet cable through 2 D-Link switches to our modem. We have a Surfboard 6183 modem, a Netgear router in use in our home, and a Linksys router I'd like to add. I believe this requires two IP addresses, since we don't want to have a bridge/relay/extender set up. We'd like two separate main routers.

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...you will need to:

1. Go to https://www.xfinity.com/support/rate-card (requires XFINITY account logon) and check if the option for having an additional IPv4 address is available in your area. The option will be listed under "XFINITY Internet" on the last page. If the option is available, go to step 2. If it is not available, then you will not be able to get one. 
2. Upgrade your SB6183 modem to one that has two or more ethernet ports to allow for configuration of a separate IP address into a separate router. (E.G. ARRIS SB8200,  Netgear CM1100, Motorola MB8600. 
3. Post back here and your request will be elevated to a Comcast Specialist for processing. 

Note Comcast allows only one modem or gateway per consumer account.