Redeploying an IP Phone 1120E 335Gratuitous Address Resolution Protocol ProtectionGratuitous Address Resolution Protocol (GARP) Protection protects the IPPhone 1120E from GARP Spoof attacks on the network. In a GARP Spoofattack, a malicious device on the network takes over an IP address (usuallythe default gateway) by sending unsolicited (or Gratuitous) ARP messages,thus manipulating the ARP table of the victim machine. This allows themalicious device to launch a variety of attacks on the network, that resultsin undesired traffic routing. For example, a GARP attack can convince thevictim machine that the malicious device is the default gateway. In thisscenario, all traffic from the victim machine flows through the maliciousdevice.To enable GARP Protection during configuration, see Procedure 66"Installing the IP Phone 1120E" (page 323).Extensible Authentication ProtocolExtensible Authentication Protocol (EAP) is a general protocol that fulfillsthe protocol requirements defined by 802.1x. For further information about802.1x, see Appendix "802.1x Port-based network access control" (page455).Redeploying an IP Phone 1120EYou can redeploy an existing previously configured IP Phone 1120E on thesame Call Server. For example, the IP Phone 1120E can be assigned toa new user (new TN) or to an existing user who moved to a new subnetby changing the TN of the IP Phone 1120E. For further information, seeConverging the Data Network with VoIP Fundamentals (NN43001-260).Procedure 70Changing the TN of an existing IP Phone 1120EStep Action1 Repower the IP Phone 1120E.During the reboot sequence of a previously configured IP Phone, theIP Phone 1120E displays the existing node number for approximately5 seconds.2 If the node password is enabled and NULL, choose one of thefollowinga. Disable the password.b. Set the password as non-NULL.Nortel Communication Server 1000IP Phones FundamentalsNN43001-368 01.02 StandardRelease 5.0 20 June 2007Copyright © 2003–2007, Nortel Networks.
