> Date: Wed, 24 Feb 2010 18:44:12 +1100
> Subject: RE: netstat ?
> From: t...@clewlow.org
> To: debian-user@lists.debian.org
> 
> >>
> >> tcpdump host 172.16.4.1 -XX
> >>
> >> if you want to save the data in a file for later analysis
> >>
> >> tcpdump host 172.16.4.1 -XX >> somefile
> >>
> >> ******
> >>
> >> if you want to know why you are doing this
> >>
> >> man tcpdump
> >>
> >> Regards, Tim.
> >>
> >>
> >>
> >
> > Thank you for your reply . Sorry , Is this equal to the following ?
> >
> > #tcpdump dst 172.16.4.1
> >
> > But the payload data is not human readable , even if adding '-XX'
> > switch . Can you please let me know if I need to use another
> > appropriate switch or it comes from the fact that the protocol is
> > some proprietary one ?
> x
> 
> tcpdump dst 172.16.4.1
> 
> Will give you a summary of packets that are going to (dst) 172.16.4.1
> 
> If you want the payload you need the -XX switch, also, tcpdump
> defaults to only capture 96 bytes, if you want the full payload do
> 
> tcpdump dst 172.16.4.1 -XX -s 0
> 
> This will give you hex and ascii representations of all data being
> sent to 172.16.4.1. However, the data may not be human readable. For
> example, if the data is actually a mp3 file, then converting the
> packet to ascii wont mean it makes any sense as ascii, but if the
> data is a text file, then converting the packet to ascii probably
> will make it readable.
> 
> HTH, Tim.
> 
> 
> 
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> 

Thank you for your reply . I tried like the following to capture the payload 
data from some text file exchanged in between :

#tcpdump -s 0 -XX src 172.16.4.1

But I cannot see any human readable text being captured . Can you please 
correct me what I am doing wrong here ?


 
                                          
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