[X-Unix] How to monitor inbound/outbound network traffic?

[cheryl schneider]

On May 20, 2005, at 10:39 AM, Brent Baisley wrote:

> Yo can try using tcpdump in your terminal. It's more of a technical  
> tool, but at the very least you can find out what ip address you  
> are talking to.
>
> sudo tcpdump

Read the man pages on tcpdump for additional syntax.


to capture packets on en1 to/from a given host:

sudo tcpdump -i en1 host <host name>


if you want to narrow it down to packets being received on a given port:

sudo tcpdump -i en1 dst port <port number>

Also take a look at Ethereal, an open source packet sniffer that'll  
filter the information in a more human-readable format. It runs in an  
X Windows environment, including X11.

-------------------------------------
Cheryl Schneider, ACSA
cheryl at themacworks.com


> On May 20, 2005, at 10:16 AM, Rad Craig wrote:
>
>
>> Right now, I'm watching the light (xfer) on my network card and  
>> it's lit up almost solid, like I was downloading/uploading  
>> something, something (data) is going in or out.  I want to know  
>> what it is?  Which application is sending it and what its  
>> sending.  I don't have anything running right now that should be  
>> constantly transferring data like this.  Its as if someone is  
>> sucking data off of my computer.  Is there a program/app/utility/ 
>> script that will allow me to find out what is going on?
>>
>>
>> Rad...
>>
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>> stuff:
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>>
>>
>>
> -- 
> Brent Baisley
> Systems Architect
> Landover Associates, Inc.
> Search & Advisory Services for Advanced Technology Environments
> p: 212.759.6400/800.759.0577

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