[ns] question about the trace file

[Liang Qin]

Hi ns2 users,

When I reading the trace file, I have a question which can't find answer
from the manual, for example:

r 150.0000000 _2_  AGT   --- 65 tcp 1020 [a2 2 1 800] --- [1:0 2:1 32 2}
[12 0] 1 2

what do [12 0] and "1 2" mean? how do I know the hop count and the next
hop?

Thank you!

Liang Qin