The initial question was not whats the best way to measure line usage but if incomming spam can create so much traffic that it comes to a noticeable reduction.
mtr and mrtg are toosl to answer that question.
In my opinion spam alone shouldn't create such a big reduction
spam is 80+% of incoming SMTP, do you think that is irrelevant to WAN link congestion.
, because one single mail with a larger attachment is creating the same or also much more traffic.
much spam is HTML, and often averages 20+ KB/msg.
To understand if this connection is "overloaded" good old ping and traceroute should be enough.
mtr is better, because of the stats for packet loss and min/avg/max trip times.
To find an answer what's causing most traffic Glenn can temporaly disable/block certain traffic by stopping the smtp-service or closing http, ftp or all other ports on the firewall.
come on, the first question: is the link congested?? is the first hop averaging 3 ms per trip, or 300 ms or 3000 ms? are there any packets lost?
Len
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