[Planetlab-users] historical host-IP mapping?

[David L. O. <dav...@cs...>]

When analyzing historical logs taking by PlanetLab measurement tools, I have
found it not uncommon for hosts to be identified by their hostname or IP
address, but not both. This raises a difficulty when trying to correlate
historical measurements taken at the same time on the same set of hosts, but
by different tools. In particular, if one masurement tool logged
measurements by hostname and the other logged by IP address, there is no
good way to "join" the two datasets by node identity because the
hostname<->IP mapping that DNS gives me today may be different from that
which was current at the time the measurements were taken.

As you might expect, the problem grows worse and worse the farther back in
time you go (today's DNS mappings become less and less relevant).

So my question is, has anyone kept track of the hostname<->IP mapping for
all PlanetLab hosts over time? If one had a table that mapped (hostname,
time) -> IP or (IP, time) -> hostname, then correlating node identities that
were recorded as only hostname or only IP address would be possible.

Thanks much,
David