Re: Hex Offset Needed

[Martin Visser <martinvisser99 () gmail com>]

John,

This is a bit tricky. Firstly I don't believe that there is a HTTP response
code (or status code) with a value of "0"

(See http://en.wikipedia.org/wiki/List_of_HTTP_status_codes and the RFCs )

Also the HTTP "User-Agent" is going to go out in the request, and is not
seen in the response. So whatever you do needs to be "stateful" knowing that
the response is associated with a particular requests.

Also I don't think there is a guarantee and on the "offset" in a packet
where the response code will be and almost certainly not for the
"User-Agent"  string as it usually preceded by the "Accept" string which is
quite variable amongst browsers.

However you can use the Wireshark "Packet Bytes" pane (usually at the bottom
of the window) to see if you cand devise something that is a "good enough"
filter to limit what you capture and then refine it further with Wireshark
to do it properly.



Regards, Martin

MartinVisser99 () gmail com


On Tue, Mar 2, 2010 at 11:36 AM, Sheahan, John
<John.Sheahan () priceline com>wrote:

>  Another way for me  to track this problem down is for me to sniff all
> Safari browsers on MAC’s using HTTP coming into our webservers.
>
>
>
> I will need to create a filter using the offset values for:
>
>
>
> HTTP_USER_AGENT=Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10_4_11; en)
>
>
>
> Can anyone help me this together?
>
>
>
> Thanks
>
>
>
> john
>
>
>
>
>
>
>
> *From:* wireshark-users-bounces () wireshark org [mailto:
> wireshark-users-bounces () wireshark org] *On Behalf Of *Sheahan, John
> *Sent:* Monday, March 01, 2010 5:38 PM
> *To:* 'Community support list for Wireshark'
> *Subject:* [Wireshark-users] Hex Offset Needed
>
>
>
> I am trying to troubleshoot an HTTP problem where the StatusCode=0 in the
> HTTP header.
>
>
> I need to capture packets containing this parameter but since I am doing it
> on a Netscout probe, I have no way to figure out the offset of this in a
> packet.
>
>
>
> Can anyone tell me what hex offset I would need to put in as a filter to
> capture these packets?
>
>
>
> Thanks
>
>
>
> John
>
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