[Snort-users] [bgallia at ...442...: Castor's use of "ECN" shut-off]

Phil Wood cpw at ...440...
Tue Sep 12 11:30:14 EDT 2000

Folks, the included message explains why I was getting some alerts from
portscan due to RESERVEDBITS set:

Sep 8 00:19:40 x.x.x.x:1760 -> y.y.y.y:80 SYN 21S***** RESERVEDBITS

I had read the source for tcpdump and found reference to RFC2481 which
mentioned the reserved bits.  But, I didn't know it was in "production" use.

So, should one ignore these, at least at the "email/paging" level?


Phil Wood, cpw at ...440...

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