128 Nortel IP Phone 2004— Speed: 10 (Mb) or 100(Mb)— Auto-Negotiate Capability: N— Auto-Negotiate Completed: N—End—Gratuitous Address Resolution Protocol ProtectionGratuitous Address Resolution Protocol (GARP) Protection prevents the IPPhone 2004 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. The malicious devicealso launches a variety of attacks on the network, that results in undesiredtraffic routing. For example, a GARP attack can convince the victim machinethat the malicious device is the default gateway. In this scenario, all trafficfrom the victim machine flows through the malicious device.To enable GARP Protection during configuration, see Procedure 18"Installing the IP Phone 2004 for the first time using manual configuration"(page 110) or Procedure 19 "Installing an IP Phone 2004 for the first timeusing DHCP" (page 118).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" (page469).Redeploying an IP Phone 2004You can redeploy an existing previously configured IP Phone 2004 on thesame Call Server. For example, the IP Phone 2004 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 2004. For further information, seeConverging the Data Network with VoIP Fundamentals (NN43001-260).Procedure 22Changing the TN of an existing IP Phone 2004Step Action1 Repower the IP Phone 2004.Nortel Communication Server 1000IP Phones FundamentalsNN43001-368 02.01 StandardRelease 5.0 7 December 2007Copyright © 2003–2007, Nortel Networks.
