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Xfinity IPV6 Only + OpnSense (alien.top)

submitted 11 months ago by [email protected] to c/[email protected]

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Hi all. I’m wondering if anyone has any insight on changes going at XFinity.

Setup: Netgear CM1000 Modem -> OpnSense Router -> Several Managed Switches (FS and HP).

It seems like they’ve done maintenance that went to IPV6 only. That breaks everything I have configured (Unbound DNS, VPN, etc). Are they phasing out dedicated IPV4 addresses for residential? Or is this just a personal issue?

I work from home. They sent me a notifications saying they were going to be doing maintenance yesterday so I went into the office.

Come home, things are still out. I restart the modem, says I have internet on the lights, but not working on WiFi. I go on my PC, some stuff is working, but others aren’t. My OpnSense dashboard doesn’t show an IPV4 address in the WAN. On the PC I tested the theory with “ping google.com -4”. Nothing. Regular pings work because it gets an IPV6 for popular services. I connected my laptop to the modem directly to reach the WebUI where it also said IPv6 only.

If anyone has a way of getting IPV4 back on my WAN, I’d appreciate it.

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[–] [email protected] 1 points 11 months ago (1 children)

In general, I disable ipv6 so it only grabs ipv4. I would try that. They may have enabled something that will not issue an ipv4 if an ipv6 is issued.

[–] [email protected] 1 points 11 months ago

Gotcha. I always had both in the past but you’re right.

[–] [email protected] 1 points 11 months ago

you could do a span or traffic mirror in one of the switches to sniff on the traffic being sent. i just did it on mine and looks like you do get ipv6 neighbor discovery packets, but they also reply to bootp. you should be able to get ipv4 only, at least it works for me.