Nortel 2001 Installation And Operation Manual page 168

Page 168 of 430
Gratuitous Address Resolution Protocol Protection
Reinstalling an IP Phone 2007
553-3001-368 Standard 7.00
Nortel IP Phone 2007
The following statistics are displayed:
— Link: Up
— Duplex: Full
— Speed: 10 (Mb) or 100 (Mb)
— Auto-Nego Capability: N
— Auto-Nego Completed: N
Gratuitous Address Resolution Protocol Protection (GARP) prevents the
IP Phone 2007 from GARP Spoof attacks on the network. In a GARP Spoof
attack, a malicious device on the network takes over an IP address (usually
the default gateway) by sending unsolicited (or Gratuitous) ARP messages,
thus manipulating the ARP table of the victim's machine. This allows the
malicious device to launch a variety of attacks on the network, resulting in
undesired traffic routing. For example, a GARP attack can convince the
victim machine that the malicious device is the default gateway. In this
scenario, all traffic from the victim's machine flows through the malicious
device.
To enable GARP Protection during configuration, refer to Procedure 26,
"Installing an IP Phone 2007 for the first time using manual configuration"
on page 151 or Procedure 26, "Installing an IP Phone 2007 for the first time
using DHCP" on page
You can reinstall an existing, previously-configured IP Phone 2007 on the
same system. For example, the IP Phone 2007 can be assigned to a new user
(new TN) or to an existing user who moved to a new subnet by changing the
TN of the IP Phone 2007.
August 2005
End of Procedure
158.