[Asterisk-Users] 1/3 packets are reported dropped by tethereal

[Abhimanyu Rapria]

Hi

When i ran the below command on vicidial dialer:

[root at vicidial2 ~]# tethereal -i eth0 -a duration:300 -w sample.cap
Capturing on eth0
320167
147496 packets dropped

on net i found:  When i ran Acterna PVA-1000 on sample.cap it showed Max
Jitter about 20 % and packet loss and echo as major cause of voice
degradation. MQS was also less 2.59 where as it should be around 5.0. are
packets being dropped at interface card or at kernel and how to correct it.
Machine configuration is given below:


So "1000 packets captured" means, in Tethereal and tcpdump, "1000 packets
read from libpcap and processed".

What "100 packets dropped" means is that, of all the packets supplied to the
kernel's packet capture mechanism that passed the filter, 100 of them were
dropped because there wasn't enough room in the kernel's buffer for them;
this means that packets aren't being read from the kernel's capture
mechanism fast enough by the application.

Machine configuration:
Linux vicidial2.esselshyam.net 2.6.11-1.1369_FC4smp #1 SMP Thu Jun 2
23:08:39 EDT 2005 i686 i686 i386 GNU/Linux
Machine Model: HP dx6120 MT
RAM 1 GB
HDD 80 GB SATA
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