Nortel 2033 Installation And Operation Manual page 357

Gratuitous Address Resolution Protocol Protection
Extensible Authentication Protocol
Reinstalling an IP Phone 1120E
For further information about TFTP firmware upgrade, see Appendix H
"TFTP Server" on page
Gratuitous Address Resolution Protocol (GARP) Protection protects the
IP Phone 1120E 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 58,
"Configuring the IP Phone 1120E" on
Extensible Authentication Protocol (EAP) is a general protocol that fulfills
the protocol requirements defined by 802.1x. For further information on
802.1x, refer to Appendix C "802.1x Port-based network access control" on
page 493.
You can reinstall an existing previously configured IP Phone 1120E on the
same Call Server. For example, the IP Phone 1120E 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 1120E.
Nortel IP Phone 1120E
571.
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IP Phones Description, Installation, and Operation
Page 357 of 600
339.