On 2026-02-19 09:14, Richard Owlett wrote:
I date from era of CPUs with 12AX7s powered via 5U4GBs with attached KSR33. I bump up against my 2GB/mo bandwidth allowance maybe 3 times a year ;}

How would I check?
For such as I, is there a relevant distinction between IPv4 and IPv6 except address space?

Not really. Bandwidth is determined by your ISP.

I find these helpful:

man interfaces

https://wiki.debian.org/IPv6PrefixDelegation

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