The first query is a default setting in the sysctl.conf file
# Enable TCP SYN Cookie Protection
net.ipv4.tcp_syncookies = 1
A SYN Attack is a denial of service attack that consumes all the resources on your
machine, forcing you to reboot. It is achievable from internal internal resources or
external connections A TCP SYN cookie is a well known exploit and this feature enables
TCP SYN cookie protection
Regards,
--
Sunil Dhaka
in search of Linux enlightenment
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