JBBO_1508's profile

Regular Visitor

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4 Messages

Mon, Jan 4, 2021 6:00 AM

Second IP Address

Hi,

 

I saw the other posts about modems like the S33 needing a second IP address for the two ports to work.  I could really use this @EG  (thanks for helping on this issue in general), namely because I need to use a MoCA setup already in order to beam signal around the house - what with remote teaching coming up in Feb and many devices that connect only by ethernet (such as Xfinity's Flex device in fact; and I'm out of ports). 

 

Thanks.

Responses

EG

Expert

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86.5K Messages

4 m ago

Why not use a router connected to the modem ? Most have 4 ethernet ports and WiFi.

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Regular Visitor

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4 Messages

4 m ago

Well, I originally thought I would just use an old modem I have, and have two modems on two separate ends of a split Coax signal - but that doesn't work for reasons that now seem like they should have been obvious to me all along (two devices with the same public IP address).

 

BUT then I just couldn't believe that I also can't have two IP adresses served out from the new modem with two ports - is it true that this is because of IPv4 running out of addresses (seems like a bad reason)?

 

Also my main router is part of an already stretched-too-thin WiFi mesh network.  I think this internet will only be reliable if I could use MoCA to send a 'fresh' signal from the modem to this other wired extender/router thing that I have.  I could use the lan ports on the back, but I just wanted to check this possibility because I think that comes with the cost of a speed bottleneck (and that router already has so many wired and wifi connections).

Regular Visitor

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4 Messages

4 m ago

Awesome, yes, thanks.

 

I guess I just thought that because the modem is registered and it has two ports, that it would just pull two IP addresses if that's what it needed.  But now I understand that these are essentially "assigned."

EG

Expert

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86.5K Messages

4 m ago


@JBBO_1508 wrote:

 

BUT then I just couldn't believe that I also can't have two IP adresses served out from the new modem with two ports - is it true that this is because of IPv4 running out of addresses (seems like a bad reason)?

 

With a plain vanilla cable modem, two public / WAN IP addresses supplied from Comcast are needed for both ports to be able to gain access to the internet

 


O/k if you really want to have two public IP's assigned, I can escalate this for you.

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EG

Expert

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86.5K Messages

4 m ago

They supply only a single public IP to a residential connection.

 

They are phasing it out but I'm going to escalate your issue to the Comcast corporate employees that are available to these boards. We've seen cases here where they have been able to get this accomplished for customers even when it is not listed in their rate cards, YMMV. You should get a reply here in your topic. Good luck !

 

P.S. Be advised that if it is available in your area anymore, there will be a small additional fee charged.

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Regular Visitor

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4 Messages

4 m ago

Thanks, sounds good.

Official Employee

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2.4K Messages

4 m ago

Hey there, @JBBO_1508,

 

I would love to check to see if your local area offers the 2nd IP. Most likely, as our Expert EG mentioned, it won't be available, but we can always check! Can you please private message me your full name and service address? Thank you for posting to our forums. 
To send a private message, please click my name "ComcastMartin" then select "Send a Message" on the right side.

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