Unix administration - mpathd and snoop

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Author mpathd and snoop
msh@mindless.com

2006-09-23, 1:46 am

Hi

I need to be able to see when a TCP message has been sent from my
machine.

I have two NICs in this machine running mpathd so that when one NIC
fails, I can fail over to the second NIC. These are set up correctly
and mpathd works as expected. I have a virtual IP address setup on the
first NIC which switches over to the second NIC when the first fails.
All IP addresses are pingable.
My software uses the virtual IP address.

When I snoop the NIC, I only see the TCP Acks being received from the
destination IP address not the data being sent from the virtual IP
address.
When mpathd is disabled, snoop works as expected.

I am using the following switches with snoop:
snoop -d bcme0 -x 54 port 2340 not multicast not broadcast

Thanks,
Mike.

Mark

2006-09-28, 7:33 am

What you describe sounds normal. If you want to snoop the data then
sniff the other NIC.

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