Can I check data being uploaded in a Firefox connection to a web site?
 

I use Firefox 3.5.9 and Ubuntu 9.10.

There is a suspicious amount of data (more than a megabyte) being uploaded from my computer whenever I log onto a commercial web site on which I advertise rental properties.

Is there any way I can see the data being uploaded - I am pretty familiar with the Unix/Linux system and commands.

TIA

If you want a quick look at requests and responses try Firebug or TamperData, elif you also need to log (and maybe modify?) them try Paros or Burp else tcpdump or wireshark?

Hi, despite what unSpawn said,

you could keep track with Gkrellm, and it's plugins.

There is probably a more expedient method,

But Gkrellm tells me everything I need.

Date/Time Received and sent in Kilobytes.

Hope this helps. Glenn

Thanks both - I will look at tcpdump first.

Hello again

I tried tcpdump - but no good!

I didn't mention that I am on a dial-up modem connection, so there is no network interface for tcpdump to check!

Does anyone know a way to "snoop" on data sent from Firefox with such a connection. There is still a lot of data going out that I don't understand. If I was using Windows rather than Linux I would suspect a virus/worm/etc.

Dial-up connections usually use ppp0, right? Please confirm what interface your dial-up connection is using (run 'ifconfig -a' and paste here if you don't know).

You can point tcpdump to ppp0 (same as if you had an ethernet connection...same method, different interface): tcpdump -i ppp0

...and in addition to what's been offered already please be verbosely descriptive when replying.
"No good" is not a statement that holds any clues as to your usage in terms of command line, BPF filtering et cetera.


In the first reply I offered you six possibilities of which you've only tried one.

Thanks unixfool!