15

IP/MAC Binding

15.1 IP/MAC Binding Overview

IP address to MAC address binding helps ensure that only the intended devices get to use privileged IP addresses. The ZyWALL uses DHCP to assign IP addresses and records to MAC address it assigned each IP address. The ZyWALL then checks incoming connection attempts against this list. A user cannot manually assign another IP to his computer and use it to connect to the ZyWALL.

Suppose you configure access privileges for IP address 192.168.1.27 and use static DHCP to assign it to Tim’s computer’s MAC address of 12:34:56:78:90:AB. IP/MAC binding drops traffic from any computer with another MAC address that tries to use IP address 192.168.1.27.

15.2 IP/MAC Binding Commands

The following table lists the ip-mac-bindingcommands. You must use the configure terminal command to enter the configuration mode before you can use these commands.

Table 64 ip-mac-binding Commands

COMMAND

DESCRIPTION

[no] ip ip-mac-binding interface_name

Turns on IP/MAC binding for the specified interface. The no command turns

activate

IP/MAC binding off for the specified interface.

[no] ip ip-mac-binding interface_name

Turns on the IP/MAC binding logs for the specified interface. The no

log

command turns IP/MAC binding logs off for the specified interface.

ip ip-mac-binding exempt name start-ip

Adds a named IP range as being exempt from IP/MAC binding.

end-ip

 

 

 

no ip ip-mac-binding exempt name

Deletes the named IP range from the list of addresses that are exempt from

 

IP/MAC binding.

 

 

show ip ip-mac-binding interface_name

Shows whether IP/MAC binding is enabled or disabled for the specified

 

interface.

show ip ip-mac-binding all

Shows whether IP/MAC binding is enabled or disabled for all interfaces.

show ip ip-mac-binding status

Displays the current IP/MAC bindings for the specified interface.

interface_name

 

 

 

show ip ip-mac-binding status all

Displays the current IP/MAC bindings for all interfaces.

show ip ip-mac-binding exempt

Shows the current IP/MAC binding exempt list.

ip ip-mac-binding clear-drop-count

Resets the packet drop counter for the specified interface.

interface_name

 

 

 

debug ip ip-mac-binding activate

Turns on the IP/MAC binding debug logs.

no debug ip ip-mac-binding activate

Turns off the IP/MAC binding debug logs.

 

131

ZyWALL (ZLD) CLI Reference Guide