5 Messages
At the end of every month my WAN DHCP lease gets reduced to 2 hours
Xfinity keeps reducing my DHCP lease to two hours consistently during the final week of the month for the entire week. The rest of the time, the DHCP lease is 4 days long. This causes internet interruptions every 90 minutes, which interrupts my P2P connections. Phone support is completely unhelpful and blames my modem for short DHCP leases. As far as I am aware, this is all caused by their DHCP server handing out these very short leases. How do I get an answer as to why this is now happening monthly or get this issue solved?
flatlander3
Problem Solver
•
1.5K Messages
1 year ago
As you say, you don't control the DHCP server upstream on the WAN. Lease times go short like that when they are working on stuff in your area, and it's more likely than not your external IP address will change at some time soon. (It can change just randomly too). Ordinarily, it wouldn't matter what the lease time is. A renew/rebind is pretty fast. Where you run into issues is when the communication with the DHCP server fails, and has to retry a bunch of times, or if an IPV4 and especially an IPV6 server is overloaded and can't respond.
Mitigation? If your equipment can do it (Xfinity rental equipment can't), disable IPV6 on the WAN temporarily until Xfinity is done messing with the network, or you can try not releasing the lease before a renew/rebind if it's an option. Then you would be "up" until the communication with the DHCP server is back. If IPV4 is failing too you are out luck.
One thing you can do is log into your modem/gateway and check out what's going on as afar as signal power levels/errors go. UDP is a lossy protocol. If the conversation is getting mangled due to signal problems/line out of spec, you can have issues too. Maybe take a look and see if there is anything you can clean up on your end with cabling/components like splitters/amps/connectors/surge or lightning suppressors hanging off your coax. Maybe it was marginal in the first place, or they "fixed" something and now your line is out of spec. Start here:
https://forums.xfinity.com/conversations/your-home-network/internet-troubleshooting-tips/602dae4ac5375f08cde52ea0
6
XfinityDemitrius
Official Employee
•
1.8K Messages
1 year ago
Hey @user_deae5f,
Thank you for reaching out and letting us know of your concerns via our official Xfinity Community Forums support page. The information that @flatlander3 is invaluable and great technical advise to help look into the matter.
Reviewing the conversation, it is quite odd that you are experiencing renewals and new assignment after such a very short period of time. We also see that your Xfinity Gateway is in Bridge Mode. As a troubleshooting method, have you attempted to use the modem outside Bridge Mode and use the router functionality from the rental device versus your own personal third-party networking device? This would be something we want to try to help eliminate any other possible issues outside the our equipment.
This can help climate any possible network collisions, get more accurate readings on our end, and help troubleshoot the issue further if you are still experiencing issues.
Would you be able to use only the Xfinity Gateway, disable Bridge Mode, and see if you are still experiencing issues with any intermittent modem resets or renewals?
(edited)
2
0