Comment 5 for bug 346378

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Kees Cook (kees) wrote : Re: [Bug 346378] Re: net.ipv4.tcp_syncookies is a unknown key (CONFIG_SYN_COOKIES=y missing in build?)

grep CONFIG_SYS_COOKIES /boot/config-*

That should tell you how the installed kernels have been configured. The
kernel team should be able to help (they are already subscribed).