What do you want to see?

Some implementations of netstat allow flags with more information:

netstat -s

netstat -p tcp

netstat -p ip

See the man page of netstat, for the specific flag do you
want.

Do you have a lot of connections dropped, data packets retransmited ?

Note: An unproportional data packets retransmited shall mean
that there are a lot of collisions that could signicate a network
congestion.or not?

Regards. Hugo.