IPV6
Internet Protocol Version 6
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Frequency of DHCPv6-PD change?

Since the replacement of my cable modem on my business service has been an utter trash fire with regard to service being "the same before and after" the replacement, as noted here, I have been relegated to using bridge mode and forgone my static IPv4 (and static IPv6) to actually get functional IPv6.  This mostly just works. My question is this: How often do dhcpv6-PD prefixes change? the default lease time is 3 days, which means my device should ask for the same prefix it has after 36 hours. Can any users give me an experience of how often this changes? I have had static for so long now I can't even recall what the experience was like before. 

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Official Employee

Re: Frequency of DHCPv6-PD change?

Hi! Thank you for your patience and for reaching out to Comcast. You have reached a Digital Care team of expert specialists who are dedicated to assisting customers with all aspects of their services!

We are doing our very best to respond as quickly as possible during these challenging times. It is known that there may be delayed responses. However, the best thing about contacting Comcast through this outlet is you can always go about your day instead of waiting on hold and we can always pick up from where we left off at any time of the day!

 

Thank you for allowing me the opportunity to help with this! I definitely understand how important it is have your services working correctly for your business! I am sorry to learn that we have made you feel this way with the cable modem replacement! We offer our sincerest apologies for the inconvenience that this has caused you. I see that you have been waiting for over 2 hours for a response and I appreciate you for the time you have been waiting! Due to that, I will take complete ownership of this issue and do my best to provide a solution in a timely manner. Thank you for that great question! After further research, I have discovered in most cases they will stay until a reboot. I have actually had the same assigned IP for almost 4 months now. You should be able to force a renew. Here is one great link for more details.   https://comca.st/3kAwZJM

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Official Employee

Re: Frequency of DHCPv6-PD change?

Hi! Thank you for your patience and for reaching out to Comcast. You have reached a Digital Care team of expert specialists who are dedicated to assisting customers with all aspects of their services!

We are doing our very best to respond as quickly as possible during these challenging times. It is known that there may be delayed responses. However, the best thing about contacting Comcast through this outlet is you can always go about your day instead of waiting on hold and we can always pick up from where we left off at any time of the day!

 

Thank you for allowing me the opportunity to help with this! I definitely understand how important it is have your services working correctly for your business! I am sorry to learn that we have made you feel this way with the cable modem replacement! We offer our sincerest apologies for the inconvenience that this has caused you. I see that you have been waiting for over 2 hours for a response and I appreciate you for the time you have been waiting! Due to that, I will take complete ownership of this issue and do my best to provide a solution in a timely manner. Thank you for that great question! After further research, I have discovered in most cases they will stay until a reboot. I have actually had the same assigned IP for almost 4 months now. You should be able to force a renew. Here is one great link for more details.   https://comca.st/3kAwZJM

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Re: Frequency of DHCPv6-PD change?

At every reboot is super inconvenient, but I can deal with it until my static issues are resolved by Comcast, I suppose. Next question: 

I am receiving a /56 as a PD. How many prefixes can I actually use out of that block. I seem to be running into a dynamic limit of 8, which isn't enough. I can statically assign from seemingly anywhere in the block, so I don't know where the limit is - my CPE or the Comcast side - since I have never done dynamic assignments in this way. Is there a limit to how much of the /56 I can use? If so, how is it enforced?  

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Official Employee

Re: Frequency of DHCPv6-PD change?

Thank you so much for your patience and for that great question. The limit of prefixes that can be used is 8. Here is also a great link that will include an overview of Comcast Business Static IPs and your local area network. Please let me know if this helps. https://comca.st/2Ckd1BE;

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Re: Frequency of DHCPv6-PD change?

Ummm, ok? What is the point of allocating a /56, or a /59, or anything bigger than a /61 if you won't allow the use of more than 8 /64? FWIW, this doesn't seem to be a hard limit. I can statically assign from the very end of the /56 while in dynamic-bridge mode. That link doesn't seem to work, either. It lands me on the comcast account pages which seem to have been broken for me for about a year.  

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Re: Frequency of DHCPv6-PD change?

It seems like we need to make sure your service is working ideally. If you are able to send a private message with your name, service address, and account number, I want to make sure your modem is not only online, but your static IP is working properly. Have you tested this issue directly to the modem? 

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Re: Frequency of DHCPv6-PD change?

My static IP allotments are absolutely *not* working and have not since my modem replacement on 8/10/2020. I have provided the information requested multiple times as well as opened various tickets with support over the phone. So far I have had zero actionable response. I fact, I have had almost no response whatsoever other than "it's being escalated to a supervisor", and that was Friday 8/15/2020 at 2:10pm central time. I don't see how me giving you my account and name for a 6th time will change any of that.

This is a service that has either changed fundamentally, has been broken with a firmware, software, or policy change, or is only pseudo-supported. Knowing which of those would harm no one and would in fact let the small amount of folks experiencing it make a tactical technical decision on how to deal with it and move on rather than sit in limbo and just not know. 

My issue isn't actually that it's broken. I get that, problems are going to occur and we should expect it from time to time as no technology is perfect and broadband is no exception. My issue is that this problem seems to be systemic and that as business customers paying a higher rate for more robust service we get seemingly zero communication as to what the problem is or when/if it will be fixed. 

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Re: Frequency of DHCPv6-PD change?

Good morning, thank you so much for taking the time to reach out to the Digital Care Team here through the forums and we are so sorry to see that you are having issues with your service as this is not what we strive for. I know how frustrating this is for you and you have reached the right team to help make sure we get this taken care of for you. Can you please send us a private message with your name and the full address to the account? 

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