[Scamper-dev] scamper data collection

[Young Hyun]

For the purposes of resolving router aliases and for finger printing end
hosts, we may want to store more information about the TTL-expired packet
received at all hops (including the intermediate hops).  Currently,
scamper_hop has hardcoded fields for address and TTLs, but it would be
good if some extensible mechanism could allow the optional storage of
other data like TOS, ID, and flags from the IP header and the body of the
ICMP packet.

This feature isn't required, but it would be very nice to have if it won't
be too hard to support, since at the moment, skitter is throwing away a
lot of potentially useful data.  A crude approximation of this feature
would be the optional storage of the entire TTL-expired packet at each
hop.

 --Young