>> [...X..] with DECnet/OSI which had 20-byte addresses.  So I don't
>> see the problem with adding IPv6.  You just need a INET6CONN and
>> some C code. :)
> No, the multi protocol model of X makes an IPv6 implementation hard.
> If you rely on an IPv4-mapped IPv6 address, it is relatively easy.
> But, having INETCONN and INET6CONN then choosing an IPv6 or an IPv4
> by DNS query is hard to implement.

Ah!  I think maybe I see the problem.

So maybe you need to keep FamilyInternet and INETCONN, and use a
discriminated union instead of a simple in_addr to represent
FamilyInternet addresses?

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