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Invalid MTU in IPv6 Router Advertisements
Xfinity recently did some work in my neighborhood and as a result my upstream IPv6 topology appears to be different.
In particular, the upstream router sends IPv6 Router Advertisement messages with the MTU option set to 9192. Which is obviously wrong as I'm connected via a cable modem. It appears that one of the backbone router is leaking that.

How do I reach the right team so they could address this?
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