Advice on multiple packet capture

[jeffs <jeffs () speakeasy net>]

I've been using Snort and still consider myself a newbie although I am 
fairly familiar with writing basic rules.  Unfortunately, the feat I 
need to perform may need a more advanced set of eyes so I am hoping 
someone on this list may be able to help me out.

I need to get only 1 alert on two separate GET requests that contain 
different .jpg file names.

For example, there is a web page, it contains A.jpg and B.jpg.  If 
someone looks at it I want to be able to get one alert but NOT if they 
look at a different page which contains A.jpg and NOT B.jpg or still yet 
a different page that contains B.jpg and NOT A.jpg.  Only on the page 
the contains BOTH .jpgs should generate 1 alert. 

I've tried the within keyword but I believe this only searches within a 
single packet and as the two separate jpg files are sent via two 
separate GET requests, I believe I am working with more than one packet, 
am I correct in that assumption?

thanks for any advice.



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