ip tcp port-zero

Drops TCP control packets that have either the source or destination port set to zero.

Syntax

ip
                  tcp port-zero

no ip tcp
                  port-zero

Command Default

By default, the packets are not dropped.

Modes

Global configuration mode

Usage Guidelines

This command is supported for ICX 8100 and ICX 8200 devices only.

The no form of the command returns the ICX device to the default setting.

Examples

The following example configures the ICX device to drop TCP packets that have either the source or destination port set to zero, which could signal a DDOS attack.

device# configure terminal
device(config)# ip tcp port-zero

History

Release version	Command history
10.0.00	This command was introduced.

Commands I

ip tcp port-zero