tcpdump and connection troubleshooting

melanie_pfefer · #1 (**permalink**) 04-09-2008

Hello,

I have a client server application and the connection from client (redhat) becomes lost.

Is there a connection limit on Redhat Linux 4?
I want to use tcpdump to trace all packets between server and client: On the client side, I thought of running tcpdump. Is there a way to filter the tcpdump so that it displays only the traffic between the client and the remote server?

Do you have any other hints?

thanks.

sysgate · #2 (**permalink**) 04-09-2008

There is no connection limit, what is your application, which protocol is using ? For the tcpdump, start tcpdump as root on the client side with :

Code:

tcpdump dst your-host-name

This will sniff all the packets from localhost to the destination server.

melanie_pfefer · #3 (**permalink**) 04-09-2008

Hello sysgate,

the protocole used is RMI.
Can we narrow down the tcpdump you passed me so that it displays the traffic of a specific port?

thanks

melanie_pfefer · #4 (**permalink**) 04-09-2008

talking about RMI, could there be a limitation on the tcp port number on my machine?

sysgate · #5 (**permalink**) 04-10-2008

I don't think so, see the man pages for tcpdump and especially dst port and scr port.

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