using tcpdump

[Mahmood Naderan <nt_mahmood () yahoo com>]

Hello all users
I am using scientific linux 6.3 which kernel 2.6.32-279.5.1.el6.x86_64. The chassis, say 'A', has 3 network interfaces. 
Eth1 has valid IP and is connected to internet and eth2 has invalid IP and is connected to another local switch.

Problem is that the internet is randomly disconnected on eth1 so the computer is unreachable through ping command. At 
the same time, there is another chassis, say 'B', which has also the same configuration. I mean one interface of 'B' is 
connected to the internet (same internet witch as 'A') and one interface to local switch (same local switch as 'A'). 
However 'B' uses Ubuntu 12.04.

The internet connection is steady and that means while 'A' is unreachable, 'B' can be pinged.

The situation is very very random, so I tried to use "tcpdump -vvv -i eth1" to see if I can find any useful information 
about connect/disconnect messages.

Can tcpdump help me with this problem? Any feedback is appreciated.

 
Regards,
Mahmood
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