[Icecast] How analyze performance (buffering) problems ?

[EISELE Pascal]

Hello,

I'm looking for a method to track stream performance problems, I mean :
why does listeners got buffering ?
We are using two "front relay" that are hosted by differents providers.
The front relays are connected to our main server (which encode) that is
using two ADSL connections from two differents providers.
How can I do to know if there is a problem between "Front relay 1" and
"Main server using provider DSL connection 1" or between "Front relay 1"
and listener ?
How avoid buffering problems ? Have you got somes tips and tricks ?

Bests regards,
Pascal