tcpdump command example

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08-30-2012

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tcpdump command example

Hi,

I have linux server in a network with hardware firewall device with ip 192.168.1.1 in front.

we have domain http://t.exaple.com which resolves 192.168.1.10

My admin has blocked ping to 192.168.1.10

Now using tcpdump, how do I check if I am receiving the traffic or not ?

Could somebody post the command and describe how to analyses the dump results..

I read through tcpdump in Internet, but could not get tcpdump command example based on scenarios.

Thanks
ashok

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LEARN ABOUT OPENSOLARIS

prtdscp

prtdscp(1M)						  System Administration Commands					       prtdscp(1M)

NAME

       prtdscp - display DSCP IP addresses

SYNOPSIS

       prtdscp [-v ]

       prtdscp [-v ] -h

       prtdscp [-v ] -d

       prtdscp [-v ] -s

DESCRIPTION

       prtdscp	displays  the  IP addresses associated with a Domain to Service Processor Communications Protocol (DSCP) link. If no arguments are
       specified, prtdscp displays the IP addresses on both ends of the DSCP link. The IP address of either the Service Processor or  domain  side
       can be displayed separately by the use of the -s or -d options, respectively.

OPTIONS

       The following options are supported:

       -v    Verbose mode. Print additional details about the program's internal progress to stderr.

       -h    Help. Print a brief synopsis of the program's usage and exit. All other command line arguments are ignored.

       -d    Display only the local domain's IP address.

       -s    Display only the remote Service Processor's IP address.

EXAMPLES

       Example 1 Displaying both addresses

       The following example displays both the local domain's IP address and the remote SP's IP address:

	 # prtdscp
	 Domain Address: 192.168.103.2
	 SP Address: 192.168.103.1

       Example 2 Displaying the local IP address

       The following example displays the local domain's IP address:

	 # prtdscp -d
	 192.168.103.2

       Example 3 Displaying the remote IP address

       The following example display the remote SP's IP address:

	 # prtdscp -s
	 192.168.103.1

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWdscpr.u, SUNWdscpu.u	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Evolving			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       attributes(5)

SunOS 5.11							    25 Apr 2006 						       prtdscp(1M)

Red Hat