Re: using tcpdump

[Mahmood Naderan <nt_mahmood () yahoo com>]

> I would suspect that you have a duplicate IP address on your internet side
 
In case of ip conflict, is there any special message/packet which can be extracted from tcpdump?


Regards,
Mahmood



________________________________
 From: Michael Richardson <mcr () sandelman ca>
To: Mahmood Naderan <nt_mahmood () yahoo com> 
Cc: "tcpdump-workers () lists tcpdump org" <tcpdump-workers () lists tcpdump org> 
Sent: Thursday, May 16, 2013 6:26 PM
Subject: Re: [tcpdump-workers] using tcpdump
 


> > > > > "Mahmood" == Mahmood Naderan <nt_mahmood () yahoo com> writes:
    Mahmood> I am using scientific linux 6.3 which kernel
    Mahmood> 2.6.32-279.5.1.el6.x86_64. The chassis, say 'A', has 3
    Mahmood> network interfaces. Eth1 has valid IP and is connected to
    Mahmood> internet and eth2 has invalid IP and is connected to
    Mahmood> another local switch. 

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

..

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

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

I think not if you are not very experienced using it.  I would suspect
that you have a duplicate IP address on your internet side.

-- 
]               Never tell me the odds!                 | ipv6 mesh networks [ 
]   Michael Richardson, Sandelman Software Works        | network architect  [ 
]    mcr () sandelman ca  http://www.sandelman.ca/        |   ruby on rails    [ 
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