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Redeploying an IP Phone 1120E 363

Gratuitous Address Resolution Protocol Protection

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 machine. This

allows the malicious device to launch a variety of attacks on the network,

that results 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 machine flows through

the malicious device.

To enable GARP Protection during configuration, see Procedure 84

“Installing the IP Phone 1120E” (page 352).

Extensible Authentication Protocol

Extensible Authentication Protocol (EAP) is a general protocol that fulfills

the protocol requirements defined by 802.1x. For further information about

802.1x, see “802.1x Port-based network access control” (page 479).

Redeploying an IP Phone 1120E

You can redeploy 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. For further information, see

Converging the Data Network with VoIP Fundamentals (NN43001-260).

Procedure 87

Changing the TN of an existing IP Phone 1120E

Step Action

1 Repower the IP Phone 1120E.

During the reboot sequence of a previously configured IP Phone,

the IP Phone 1120E displays the existing node number for

approximately 5 seconds.

2 If the node password is enabled and NULL, choose one of the

following

a Disable the password.

b Set the password as non-NULL.

3 Press OK when the node number displays.

Nortel Communication Server 1000

IP Phones Fundamentals

NN43001-368 02.07

5 February 2009