is there a tool for estimating loss rates

[Yavuz Maşlak]

I have 2 leasedlines for internet. the one is in a country. other one is in 
a another country.
I am looking for a tool for estimating loss packets between 2 lines.
is there a tool for it?
for instance , while searching, I found badabing tool for that. But I 
couldn't understand how it estimates loss packets.
could you give me an example?


Thanks