On most of the networks where I have hosts, the Ethernet interface has an inet6 address with a 64 bit netmask and flags "scope global noprefixroute dynamic."

On a Comcast Business network, though, my hosts have one inet6 address with a 64 bit netmask and the same flags, plus another inet6 address with a 128 bit netmask and flags "scope global dynamic."


Testing shows that these hosts use the address with the 128 bit netmask by default as the source address for outbound connections.


I'm a little confused about the details here. Why are my hosts getting multiple addresses with different prefixes?
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