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Dropping IP Packets Containing SYN Fragments

A fragmented SYN packet is anomalous, and as such it is suspect. To be cautious, block such unknown elements from entering your protected network.

Before You Begin
For background information, read Understanding SYN Fragment Protection.

You can use either J-Web or the CLI configuration editor to drop IP packets containing SYN fragments. The specified security zone is the one from which the packets originated.

This topic covers:

J-Web Configuration

To configure screens:

Select Configure>CLI Tools>Point and Click CLI.
Next to Security, click Configure or Edit.
Next to Screen, click Configure.
Next to Ids option, click Add new entry.
In the Name box, type syn-frag.
Next to tcp, click Configure.
Next to syn frag, select the check box and click OK.
To save and commit the configuration, click Commit.

To configure zones:

Select Configure>CLI Tools>Point and Click CLI.
Next to Security, click Configure or Edit.
Next to Zones, click Configure.
Next to Security zone, click Add new entry.
In the Name box, type zone.
In the Screen box, type syn-frag and click OK.
To save and commit the configuration, click Commit.

CLI Configuration


            
               user@host# set security screen ids-option
                     syn-frag tcp syn-frag
               user@host# set security zones security-zone
                     zone screen syn-frag

Dropping IP Packets Containing SYN Fragments

J-Web Configuration

CLI Configuration

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