Subj : A small questionary on ISPs
To   : Victor Sudakov
From : Scott Street
Date : Sat Oct 23 2021 15:24:54

Hello Victor!

23 Oct 21 19:51, you wrote to me:

 SS>>     inet6 2601:48:c500:9340::c0e3 prefixlen 60 dynamic

 VS> This is very interesting. Why "prefixlen 60" on the LAN?

Perhaps - an educated guess here - Comcast's provided gateway has, potentially, 4 internal LAN interfaces.  It could be configured with a 5GHz WiFi subnet, a 2.4GHz one, the GbE ports, and a 'Xfinity Home' port.   I haven't investigated what the "Home" port is used for, but that may explain the breaking down of the /64 to /60.  Again, just a theory.

I'd tinker with the gateway to see if that is true; but, I think I've broken enough things this week.  I just spent the last 48 hours recovering my VM server from an 'upgrade' that would break my primary network interface on the server. (The first 36 trying to figure out the problem and 'fix' it, the remaining 12 hours rebuild and restore.)


Scott


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