Netgear UTM9S – ProSECURE Unified Threat Management (UTM) Appliance with DSL and Wireless modules Manual De Referência



Select the check box to the left of each MAC address that you want to delete, or click 
the Select All table button to select all entries.

Click the Delete table button. 

Set Up IP/MAC Bindings

IP/MAC binding allows you to bind an IP address to a MAC address and the other way 
around. Some PCs or devices are configured with static addresses. To prevent users from 
changing their static IP addresses, the IP/MAC binding feature needs to be enabled on the 
UTM. If the UTM detects packets with an IP address that matches the IP address in the 
IP/MAC Bindings table but does not match the related MAC address in the IP/MAC Bindings 
table (or the other way around), the packets are dropped. If you have enabled the logging 
option for the IP/MAC binding feature, these packets are logged before they are dropped. 
The UTM displays the total number of dropped packets that violate either the IP-to-MAC 
binding or the MAC-to-IP binding.

You can bind IP addresses to MAC addresses for DHCP assignment 

on the LAN Groups submenu. See 

As an example, assume that three computers on the LAN are set up as follows, and that their 
IP and MAC addresses are added to the IP/MAC Bindings table:

Host 1. MAC address (00:01:02:03:04:05) and IP address (192.168.10.10)

Host 2. MAC address (00:01:02:03:04:06) and IP address (192.168.10.11)

Host 3. MAC address (00:01:02:03:04:07) and IP address (192.168.10.12)

There are three possible scenarios in relation to the addresses in the IP/MAC Bindings table:

Host 1 has not changed its IP and MAC addresses. A packet coming from Host 1 has IP 

and MAC addresses that match those in the IP/MAC Bindings table.

Host 2 has changed its MAC address to 00:01:02:03:04:09. The packet has an IP 

address that matches the IP address in the IP/MAC Bindings table but a MAC address 
that does not match the MAC address in the IP/MAC Bindings table.

Host 3 has changed its IP address to 192.168.10.15. The packet has a MAC address that 

matches the MAC address in the IP/MAC Bindings table but an IP address that does not 
match the IP address in the IP/MAC Bindings table.

In this example, the UTM blocks the traffic coming from Host 2 and Host 3, but allows the 
traffic coming from Host 1 to any external network. The total count of dropped packets is 
displayed.