Hi, all
I'm trying to measure UDP traffic in a LAN ethernet. I would like to get
the maximum accuracy in the timestamp in order to obtain the delay in the
net. So, it would be marvellous if you could help me in some way. I have
some questions to ask:
First : Could you explain to me how do tcpdump and linux kernel work? It
means, Can I know the time between the Ethernet card 'hears' the packet and
the timestamp for this packet is printed?
Second : Which one is better in ordet to get the maximum accuracy? The first
instruction doesn't filter, but it writes more packets in the file.
tcpdump -ttne -x -s 20 -w file
tcpdump -ttne -x -s 20 udp -w file
Thank you very much, and sorry for my English
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