ASA MPF on HTTP traffic

Question

Hi, Im student who studying MPF atm, and I just wodnering about the parameters(request args regex, request body length etc..) that http provides, I was looking up and went through some resources and information on cisco website, but it was diffcult to understand all of theses parametes,
how does ASA matches up with http traffic ?? is this parameters are located in HTML ??? (body java activ-x) , where does it located, ??
thanks in advance, !!!

Answer 1

Hello Terry,
First thing to understand when we are talking about inspection on layer 5 to 7 ( In this case http) is that in order to work the client got to be on one ASA'Sinterface and the server needs to be on another one, this to allow the ASA to investigate the http session.
Now you are asking about how the ASA is going to match that traffic, well with the policy map type inspect we will decide what to match (the http request, response,etc) , we can use different things in order to do it, just as an example we can create a regular expressions that matches www.cisco.com (\.cisco\.com)  and then let the ASA know that matches the header of the http packet using that particular rule and then we will be able  to  block cisco.com as an example.
You can also match the URI, etc etc and then apply the rigth http inspection paramater.
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Regards,
Julio