Why is tcp_syncookies off by default?

From: buck (buck_at_private.mil)
Date: 08/24/04 

Date: Tue, 24 Aug 2004 09:27:56 -0700

The responses to the DoS posts here say to
echo 1 >/proc/sys/net/ipv4/tcp_syncookies.

Why is it not already 1? Is there some drawback/caveat/whatever?

buck

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