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JD42_HHGTTG
1st Topic

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6 Messages

Saturday, February 12th, 2022 12:39 PM

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DHCP Service NOT Functioning on Xfinity Gateway

My new Xfinity Gateway stopped delivering DHCP IP address the day after I received it and set it up.  EVERY DEVICE that connects to my gateway now grabs a link local address (169.254.X.X) - They ONLY way around this is to MANUALLY give a device a 10.0.X.X address in it's IP settings (but some device such as TVs don't let you do this) or to log into the router, find the connected device, copy it's MAC and create a DHCP reservation.  Which is very frustrating, but works.  However, any NEW device connecting to the network still grabs link-local.   I've also run into limitations in the router interface where comcast has dumbed it down so much that there is no where for me to FIND the reservation table I've created, so I have try to remember which was the last IP address I gave out.  Restarted the gate way several times.  This happens to WiFi AND ethernet connected devices.

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3 years ago

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CCSean1

New Problem Solver

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318 Messages

3 years ago

Hello @JD42_HHGTTG, thank you for taking the time to reach out to us on the forums I hope you are doing well! I am sorry to hear you are having this issue this is not the experience we want you to have as a valued member of the Xfinity family. Was this going on with your prior gateway as well or only on the one you just set up?

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rd1204

Visitor

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1 Message

@XfinitySean​ I am having the identical problem. Could you please help? I had my gateway about 4 months and out of nowhere, this exact thing started happening.

3 years ago

0

XfinityBrie

Administrator

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662 Messages

A Dynamic Host Configuration Protocol (DHCP) server - a type of network server - assigns IPs. The DHCP server “leases” your IP to you. IP addresses aren’t permanent, so yours won’t change often, but sometimes, due to system maintenance, you'll get a short-term DHCP lease. A short-term DHCP lease is a temporary IP address that expires after a set amount of time.

A device that’s set up correctly will auto renew the DHCP lease. There should be no halt to service.

 

Generally issues occur to the DHCP in the following scenarios:

  • power loss.
  • move your computer.
  • got a new router.
  • reconfigure your home network.

Typically a new router would resolve the issue quickly. If you're leasing the device from Xfinity, we can always send a new device. 

I am an Official Xfinity Employee.
Official Employees are from multiple teams within Xfinity: CARE, Product, Leadership.
We ask that you post publicly so people with similar questions may benefit from the conversation.
Was your question answered? Please, mark a reply as the Accepted Answer.tick

3 years ago

JD42_HHGTTG

Visitor

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6 Messages

@XfinitySean​ i never got a notification that any one replied to this forum post until today.  The issue has never been resolved, i'm still being force to create DHCP reservations for any new device I want add to my LAN.  this was NOT a problem on the previous router that I had.  And based on the subsequent response from other Xfinity users, this seems endemic with your gateways.  I am leasing this router from Xfinity, but I doubt a new one will solve my problem.  I suspect that an Xfinity firmware update bricked the DHCP service, but that's just a hypothesis on my part.

3 years ago

0

dbjordammen

New Poster

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2 Messages

3 years ago

Hi @XfinitySean @XfinityBrie 

I have having this same problem. All of a sudden gateway is not proving IP addresses to clients - the clients are taking a 169.x.x.x address and thus have no internet connectivity. I can workaround the problem by reserving an IP address for that MAC address in the gateway, but that is a pain (and handles only one client at a time). 

Is there is general fix for this problem?

Thanks!

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user_meh

Visitor

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2 Messages

3 years ago

Hello @Xfinity Support ,

I also recently started having this exact problem and would like to know if there is a general fix for it.?.

Thank you.

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JD42_HHGTTG

Visitor

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6 Messages

@user_meh​ as a short term work around, I created DHCP reservations with in the router, you need to know the MAC or physical address of your device - if you log into the router, you'll see a list of connected devices, if you expand the list, you'll see it presents the ip address and (likely a 169.254.x.x address) an then an alpha numeric string of characters in pairs separated by a colon, this is the mac address.  copy that, then click 'add dhcp reservation' give the device a name (no spaces or special characters) past the mac address and assign an IP address, e.g. 10.0.0.X - pay attention to the last number, as this can't be duplicated, between 2 and 255.  Save and have that device refresh it network connection (turn it of and back on) and this should get your device on line.

3 years ago

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XfinityAldrik

Official Employee

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1.7K Messages

Hello @JD42_HHGTTG I dearly apologize, there was an error on our end causing the delayed notification about us responding back. Just to clarify, do you have the wireless gateway in bridge mode and use a standalone or personal router?

I am an Official Xfinity Employee.
Official Employees are from multiple teams within Xfinity: CARE, Product, Leadership.
We ask that you post publicly so people with similar questions may benefit from the conversation.
Was your question answered? Please, mark a reply as the Accepted Answer.tick

3 years ago

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user_meh

Visitor

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2 Messages

Thank you @JD42_HHGTTG .  I was able to reserve an IP address for this device, so that is a good short term workaround.  (the only trouble was finding an IP that wouldn't be a duplicate, since I couldn't find an easy way to display the ones that were already in use).

@XfinityAldrik , now I'd like to fix this in the general case of new devices connecting to the network (ie: guests in the house).  I am using only the wireless gateway provided by Xfinity and two Xfi pods.  As far as I can tell, the gateway is not in "bridge mode".  There have been no changes to my network that I know of, but guests who were able to connect fine a couple weeks ago are now not getting v4 addresses.

3 years ago

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JD42_HHGTTG

Visitor

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6 Messages

@XfinityAldrik​ there is NO OTHER device on my LAN that would function as a router, so my Xfinity Gateway is NOT in bridge mode.  I'm thinking about putting it in bridge mode and disabling the wifi and using a D-Link router that I have left over from a previous job.

3 years ago

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CCJay

Official Employee

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618 Messages

Thanks for confirming. Let's try our hand at troubleshooting. Let's meet in DM to get started.

 

To send a direct message [private message]:

  •    Click "Sign In" if necessary
  •    Click the "Direct Message" icon or https://comca.st/3uXcFcK
  •    Click the "New message" (pencil and paper) icon
  •    The "To:" line prompts you to "Type the name of a person". Instead, type "Xfinity Support" there.
  •    - As you are typing a drop-down list appears. Select "Xfinity Support" from that list.
  •    - An "Xfinity Support" graphic replaces the "To:" line.
  •    Type your message in the text area near the bottom of the window
  •    Press Enter to send it

I no longer work for Comcast.

I am an Official Xfinity Employee.
Official Employees are from multiple teams within Xfinity: CARE, Product, Leadership.
We ask that you post publicly so people with similar questions may benefit from the conversation.
Was your question answered? Please, mark a reply as the Accepted Answer.tick

3 years ago

0

user_42wtf1

Visitor

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1 Message

3 years ago

I am having this exact same issue with our home Xfi router currently. I tried performing a factory reset on the router to see if that would solve the issue... and for about a day or more it seemed like it did. But now DHCP is messed up again and newly connected devices are getting 169.254.x.x IPv4 addresses assigned, which is NOT GOOD. Only permanent workaround I've found is to manually assign IPs for every device (thus bypassing DHCP entirely). This absolutely should not be necessary, but I need my phone to have internet on wi-fi! I am leasing the router from Comcast, so I will try swapping out the hardware in case that might solve the problem... but if this many people are having the same issue, I'm wondering if maybe there is something else going wrong on Xfinity's end?

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user_292e8f

Visitor

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1 Message

3 years ago

Having exact same issue here with some macs and an iPhone as well with my new xfinity router. Devices can log on to wifi but get a 169.254 address and need to have a manual address to get internet access.

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CCSelena

Problem Solver

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892 Messages

Hi there @user_292e8f! Are you still experiencing the issues? if so, can you please meet us in a DM for assistance?

 

Here's the detailed steps to direct message us: 
 • Click "Sign In" if necessary
 • Click the "Peer to peer chat" icon (upper right corner of this page)
 • Click the "New message" (pencil and paper) icon
 • Type "Xfinity Support" in the to line and select "Xfinity Support" from the drop-down list
 • Type your message in the text area near the bottom of the window
 • Press Enter to send your message

I no longer work for Comcast.

3 years ago

0

user_2aae40

Visitor

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3 Messages

3 years ago

I am having this exact issue on multiple devices.  Each day it seems more devices are losing their connection and when reconnecting, they receive the invalid 169.254.x.x addresses.  Planning to swap out my router today. 

@XfinityAldrik 

(edited)

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user_2aae40

Visitor

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3 Messages

@user_2aae40​ 

update swapped out my router at the local Xfinity store and it solved my problem.  

3 years ago

0

user_cc86eb

Visitor

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1 Message

3 years ago

I am having the same issue as well--I can manually assign IP addresses as a workaround, but that is a bandaid solution. Xfinity, please address this!!!

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user_2aae40

Visitor

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3 Messages

@user_cc86eb​ 

I swapped my router @ the local Xfinity store and activated it.  Solved all DHCP issues. 

3 years ago

0

JD42_HHGTTG

Visitor

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6 Messages

@user_2aae40​  Yes, but for how long?  Can you let us all know if this is a 'long term' solution, or if you have the same issue in two weeks?

3 years ago

0

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