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Monday, January 10th, 2022 2:23 AM

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How do I assign a static IP address to a device on my network?

I want to assign one of my network devices a static IP address.  I know this is doable in general but can someone explain how to do it on the xFi gateway? 

Problem Solver

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909 Messages

3 years ago

Hello, @user_dd9ca9. Our residential internet services have dynamic IP addresses that automatically renew. Static IP addresses are only available through our Business internet. For more information on releasing and renewing your IP address we have this awesome article

Expert

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107.1K Messages

@XfinityStephanieK wrote:

Hello, @user_dd9ca9. Our residential internet services have dynamic IP addresses that automatically renew. Static IP addresses are only available through our Business internet

That is for the WAN / public IP address that the Comcast system / DHCP server assigns to the gateway devices. Not for the IP addresses that get assigned by the gateway device's built-in DHCP server to the LAN / private clients...

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Expert

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107.1K Messages

3 years ago

@user_dd9ca9 

It is my understanding that the Comcast supplied gateway devices don't support the assignment of static IP addys to the LAN / network clients. But they do support the assigning of *reserved* IP addys to them.

The Reserved IP Address is basically the same thing as a Static IP Address.

See if this still applies. YMMV;

Log onto gateway
Go to Connected Devices > Devices
Next to your device in list select EDIT button

Under Edit Device
Configuration:
( ) DHCP
(*) Reserved IP
MAC Address:             [xx:xx:xx:xx:xx:xx]
Reserved IP Address: [10.0.0.x]   

 

You have to set the Reserved IP Address value the same as the value you set on the device itself.

You may have to reboot the device for the change to go in effect.

The Reserved IP Address must be in the range shown at: Gateway > Connection > Local

IP Network

(edited)

Visitor

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1 Message

3 years ago

Ok, I just got my block of static ip addresses and am trying to assign one of them to the server associated with it.  The server is assigned a 192.168.1.xxx addresses.  I can ping it within the local network (I put my pc onto the same gateway).

I found the "Reserved IP" setting - set it.  Still can ping within the local network.

Now I'm trying to associate my public ip address (part of the ips that came with the Comcast Business order - install completed yesterday).  So far, no good.

I've tried NAT (I know, I see the warning that it's a security risk.  I'll deal with that after I get some basic external connectivity).  I could successfully add an entry for the public IP address going to the private 192.168.1.xxx address.  But it doesn't work ("Destination host unreachable" from the correct gateway internal ip address).

I looked at static routing, but am confused.  It says "Destination Subnet" (along with subnet mask), which I don't get.  I want to assign a specific ip in my block to the internal ip that the server has.

So how do I do this?

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107.1K Messages

@user_c45b42

If you are subscribed to their Business Class Service, please post your issue on their Business Class Help Forums here: https://forums.businesshelp.comcast.com  

This forum is for Residential Class service. Thank you.

I am not a Comcast Employee.
I am a Customer Expert volunteering my time to help other customers here in the Forums.
We ask that you post publicly so people with similar questions may benefit from the conversation.

Was your question answered? Please mark an Accepted Answer!tick
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