Re: checksum_mode

[Jason Brvenik <jasonb () sourcefire com>]

Pablo Nebrera wrote:
> 	I don't understand this option in the snort configuration file. 

http://www.snort.org/docs/snort_htmanuals/htmanual_2.4/node10.html#SECTION00303000000000000000

> Does it check the checksum for every packet? 

If configured to do so.

> What is the checksum of a
> packet?

http://en.wikipedia.org/wiki/Checksum

Essentially a checksum is a sanity check that the packet has not been 
corrupted or otherwise modified in flight.

more about how it is used in packets can be found here

http://www.networksorcery.com/enp/default0703.htm

> What does this option do exactly??

Checks the calculated checksum against the one in the packets and will 
discard the packets if they do not match.

> Thanks 
>
>
> Pablo
>
>
>
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September 19-22, 2005 * San Francisco, CA * Development Lifecycle Practices
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