Flags in snort rules

[Bill McCarty <bmccarty () apu edu>]

I'm trying to code a Snort rule that will match packets having the SYN flag 
set but the ACK flag not set. It seemed to me that "flags:S;" would do 
this. But, looking at packet traces seems to indicate that such a rule 
matches packets with the SYN flag set, irrespective of the state of the ACK 
flag.

Have I coded the rule incorrectly, read the packet traces incorrectly, or 
both?

Thanks

---------------------------------------------------
Bill McCarty

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