Vyatta NOS documentation

Learn how to install, configure, and operate Vyatta Network Operating System (Vyatta NOS), which helps to drive our virtual networking and physical platforms portfolio.

security firewall syn-cookies

Enables or disables the use of TCP SYN cookies with IPv4.

set security firewall syn-cookies { disable | enable }
delete security firewall syn-cookies [ disable | enable ]
show security firewall syn-cookies

If this statement is not configured, then it takes the default of SYN cookies being enabled. When SYN cookies are enabled the Linux kernel will enable a method to defeat SYN flood attacks, otherwise this method is not enabled.

disable
Disables TCP SYN cookies with IPv4.
enable
Enables TCP SYN cookies with IPv4.

Configuration mode


security {
    firewall {
        syn-cookies {
          enable
          disable
        } 
    }
}

Use the set form of this command to enable or disable TCP SYN cookies with IPv4.

Use the delete form of this command to delete the configuration of TCP SYN cookies.

Use the show form of this command to display the current setting for TCP SYN cookies.