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v4 given v6
> Given a 6bone node's v6 address, what's the best way to find a v4 address
> for the node (if it has one)?
I would look up the PTR record in ip6.int, then look up the A record
for that name. However, there are some obstacles:
The ip6.int is often not well-maintained. We knew about this
problem from the git-go.
Some people are naming their IPv6 nodes in a separate
subdomain, maybe because their regular DNS servers don't
support AAAA records.