[atlas] Empty from feild

Hi,

On 2014/06/06 17:23 , john wrote:
> Quick question about the data format.  What would cause a measurement to
> have an empty from field but contain data?  An example would be probe_id
> 13663 from measurement 1672218[1].  A cursory glance seems to happens a
> lot more with V6

The 'from' field is the address of the probe as recorded by the
controller (as opposed to what the probe reports itself as 'src_addr').

The controller takes it from the ssh connection. A probe that has both
v4 and v6 tries to initiate two ssh connections, one over v4 and one
over v6. If one of them fails, then it is possible that the probe
connects but the controller doesn't know the IP address of the one that
fails.

Philip