> Dear all,
> I have an Athlon 1.6 Ghz, RH Linux 8, connected with a X-cable to a 
> Juniper (I have a similar setup with a Cisco Catalyst). The Juniper 
> sends packets to ntop (it mirrors the backbone that runs at 100 Mbit 
> with average load of 80 Mbit). What I have noticed is that 
> ntop/tcpdump/... anything that sits on pcap looses a small packet 
> percentage although there are plenty of CPU cycles. Is there a way to 
> tune libpcap so that I can prevent/minimize packet loss?
> 
> Thanks, Luca
> 

Hi

What are your system wide limits. ie :

cat /proc/sys/net/core/rmem_max
cat /proc/sys/net/core/rmem_default

Try to :

echo 4000000 >/proc/sys/net/core/rmem_default
echo 4000000 >/proc/sys/net/core/rmem_max

then restart ntop, see if it helps.


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