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Green_T
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4 Messages

Saturday, December 3rd, 2022

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Static IP Configuration

Hello,

the company I work for relocated their offices and was assigned a new static IP and Comcast router. I've read that the static IP is configured when the router is installed but I don't recall seeing it in the router settings. I also factory reset the Comcast router because I put it in bridge and couldn't figure out how to get it out of bridge mode. Would Comcast need to reconfigure the static IP for me or is that something I can do? If so, where would I input the static IP in the router settings? The static IP that was assigned is something like 50.211.xxx.xxx and is this a public static IP or considered private? I would think public due to only having one.

The end goal is to get the static IP to route through our Cisco ASA firewall and provide internet access to the workstations. That's a whole other can of worms but for now I just need to understand where this static IP needs to be.

Thank you in advance!

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3 years ago

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Official Solution

CC_Daryl

Contributor

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34 Messages

3 years ago

Thank you for reaching out to Comcast business. Please find the following two links helpful:

 

Comcast Business Static IP overview: https://business.comcast.com/help-and-support/internet/using-a-static-ip/

 

Configuring local area network (LAN) IP addressing: https://business.comcast.com/help-and-support/internet/comcast-business-static-ip-local-area-network/

 

There is also this discussion that you might find useful: https://forums.businesshelp.comcast.com/conversations/equipment/bridge-mode/5fe0a5afc5375f08cd83256a

 

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Green_T

New Member

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4 Messages

@Comcast_Daryl​ Thank you! What about the static IP being reset. Do I need Comcast to reconfigure that or can I do that myself?

3 years ago

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CC_Daryl

Contributor

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34 Messages

To make changes to your Comcast business service, I am going to recommend that you call our Comcast business offices at 1-800-391-3000.

I no longer work for Comcast.

3 years ago

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DManciniXDS

New problem solver

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23 Messages

3 years ago

Hi Green_T, I've been through a bit of this — so, two things.

  1. Static IPs don't work in "Bridge" mode, and Comcast "doesn't support bridge mode."  You have to use their (Comcast's) routing functions on the gateway.  Statics are assigned to the gateway manually by Comcast techs, and routing these IPs through the gateway only works with the gateway in "Router" mode, since potentially multiple end devices can report a static IP (if you've more that one) to the gateway.

    In bridge mode, one and only one device can be connected to the gateway, and I believe that device therefore gets your Comcast gateway DHCP IP address (not the static, even if you only have one).  Someone can correct me on this if I'm wrong.

  2. Factory resetting the gateway wipes everything, including configured Statics.  So does putting it in Bridge mode.  Comcast techs must manually restore your static(s) to the gateway (and only after it is placed in Router mode) after such an action is taken. There is no facility for customers to add statics to the gateway on their own.

(edited)

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