Hi,
I have a linux box in a data centre, somewhere in the US..
This box runs a program which talks voip (lots of udp packets, a few
tcp packets)
with other boxes.
Being performance conscious, things like packet loss are monitored, and
there are packets being dropped.
An identical box, with the same settings for firewall etc, with the same
program, but in a totally different place,
reports no loss.
ok. run
ping -q -A -c 200 4.2.2.2
and the loss rate may be anything from 0 to 8% (on some runs it is
perfect, on others it is bad)
the data centre network operators claim it is not them, and that their
centre is fine. I don't know if the
data centre is running traffic shapers, bandwidth throttling, or what..
iptables -L reports no drop rules.
Conclusion: it is not the firewall settings that is dropping packets.
Don't think it is hardware, but I did remember hearing something about
full & half duplex
However, one can use the command:
>>mii-tool eth0
eth0: 10 Mbit, full duplex, link ok
(ethtool appears to be the newer tool, but ethtool fails on operations
I found a tool on the network called shaperprobe, that (apparently)
works out if there is any traffic shaping going on.
This tool reports no shaping..
Is it the hardware on the box? I don't think so. - it is a new box. Is
it my software - no - ping reports similar answers.
is the box heavily loaded - no. the load average is 0.00
Question:
is there a software tool to analyse network traffic and work out where
the packets are being lost (tcptrace?) and
say why they are being lost?
Thanks in advance,
Derek.
--
Derek J Smithies Ph.D.
Christchurch,
New Zealand
-- "How did you make it work??" "the usual, got everything right"
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