What Linux/*BSD distributions have Syncookies enabled by default?

In light of the recently published article on Quick Blind TCP Connection Spoofing with SYN Cookies, I wanted to see what operating systems and distributions have Syncookies enabled by default.

Distribution Sysctl Default
Ubuntu Linux 12.04 net.ipv4.tcp_syncookies On
Debian Linux 6 Off
Debian Linux 7 On
CentOS 5 On
CentOS 6 On
FreeBSD 8 net.ipv4.tcp_syncookies On
Solaris 10 Not Implemented Off
OpenBSD 5.3 Not Implemented Off

I'm not sure that turning off Syncookies is the best idea, due to the potential DoS effects from disabling them – applications should use something besides IP addresses for authentication.