Hi All,
We are doing some experiment, where we are trying to
measure the processing time taken by a node when a
packate pssess throgh it.
--------eth0[Linux-PC Router]eth1-------
We run tethereal/tcpdump(both use libcap) within this
PC at eth0(incomming interface) and eth1(outgoing
interface) . Then we find out our packate in both the
captures and the difference of two captures gives
processing time of the node
Now, the question: Is doing so a right way to measure
the processing time, as we are not sure where exactly
does libcap captures the packates. Is it right before
network driver or after it ao anywhere else?
I just came to know that On Linux, libpcap captures
packets using PF_PACKET sockets (or, on 2.0
kernels or with libpcap built on a 2.0-kernel system,
PF_INET/SOCK_PACKET sockets).
Any help on this issue will be highly appreciable.
Thanks,
Nitin
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