[OmniOS-discuss] WARNING: High TCP connect timeout rate! System (port 80) may be under a SYN flood attack!

[Bob Friesenhahn]

Since updating OmniOS to r151020, I have been seeing many "SYN flood 
attack!" warnings on the system console.  I never saw these before.

Has something changed in the TCP/IP stack which now produces these 
warnings or has my server been co-incidentally targeted for SYN flood 
attacks and was not targeted before?

Are other users seeing these warnings?

I have 45 such alerts posted since Febrary 27 (in the 
/var/adm/messages* files).

Bob
-- 
Bob Friesenhahn
bfriesen at simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/