Define SYN Filtering

The SYN Filtering page enables filtering TCP packets that contain a SYN flag, and are destined for one or more ports.

To define a SYN filter:

  1. Click Security > Denial of Service Prevention > SYN Filtering. The SYN Filtering page displays.
  2. Click Add. The Add SYN Filtering page displays.
  3. Enter the parameters.
    • Interface--Select the interface on which the filter is defined.
    • IPv4 Address--Enter the IP address for which the filter is defined, or select All Addresses.
    • Network Mask--Enter the network mask for which the filter is enabled in IP address format.
    • TCP Port--Select the destination TCP port being filtered:
      • Known Ports--Select a port from the list.
      • User Defined--Enter a port number.
      • All Ports--Select to indicate that all ports are filtered.
  4. Click Apply. The SYN filter is defined, and the Running Configuration file is updated.