Denial of service (DoS) attacks launch via SYN floods can be very
problematic for servers that are not properly configured to handle them.
Proper firewall filtering policies are certainly usually the first line of
defense, however the Linux kernel can also be hardened against these types
of attacks. This type of hardening is useful for SYN floods that attempt to overload a
particular service with requests (such as http) as opposed to one that
intends to saturate the server's network connection, for which a firewall...