IPv6 dose not come through any longer

[AdamF]

I own an ASB8200 Modem that has a 1000 mbps internet plan and I only get ipv4, no ipv6. I use to get ipv6 and ipv4 one day ipv6 drop out and never came back. I already reset the modem and try to directly connect to the modem without my router and still no ipv6 only ipv4.  I try to chat with xfinity but I can't get through. I don't even want to call as I will be on hold for hours. Any suggestions? 

[Nasir1]

I have an SB8200 and Gig speed and have this very same issue. Seems to have started with the last firmware update for hte SB8200...

Would love some help in getting it back

[AdamF]

anyone? is there a Comcast rep here that can help?

[AdamF]

Found a solution that works for me after chatting with tech support and waiting for a call back from tear 2 support because tear 1 did not know the difference between protocols. 

I found this enabled on my modem:

Link Aggregation Configuration

NOTE: Ethernet Link Aggregation applies to various methods of combining (aggregating) multiple network connections in parallel in order to increase throughput beyond what a single connection could sustain, and to provide redundancy in case one of the links should fail.

 Enable LAG

I went and disable link aggregation and modem reboot. I then went and check logs in modem and found the IPV6 protocol enabled successfully. 

I went ahead and reboot my router and here it was IPV6 working again as main protocol and IPV4 as a fallback. 

Comcast tech support is so rude and not professional. No knowledge at all bunch of people that has no business working in IT reading answer prompts. I wish that there would be another provider in my area!!!!!

[PT5]

Would like to know of a solution that doesn't require disabling LAG.