Hi,
I have a dual interface I350 card, which uses the igb driver, that I am
using as a poor mans DAG card. The idea is to receive packets on both
interfaces and use tcpdump to capture the packets for later analysis; where
the the timestamp information in the analysis is important.
I am using the 'adapter unsynced' input for tcpdump (arg -j), which tells
the card to use the raw hardware timestamps. The problem I am having is
that there is a very large offset between the timestamps on each interface;
from memory it was 3600.xxx seconds.
I am thinking that this may be caused by differing initial or uninitialised
timestamp counter values? If there is any other possible reason than any
info would be appreciated. Assuming this is the cause, is there a way to
synchronously reset the timestamp counters for each interface?
Thanks,
Dan
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