196 Nortel IP Phone 2007—End—When the IP Phone restarts, the firmware reads the setting for Full Duplexmode and sets the LAN Ethernet port, PC Ethernet port, duplex, and speedaccordingly.Use Procedure 37 "Checking Ethernet Statistics" (page 196) to confirmactivation of Full Duplex mode.Procedure 37Checking Ethernet StatisticsStep Action1 Tap the Tools icon.2 Tap the Local Diagnostics soft key.3 Tap the Ethernet Statistics soft key.The following statistics are displayed:• Link: Up• Duplex: Full• 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 2007 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 maliciousdevice 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 35"Installing the IP Phone 2007" (page 186).Nortel Communication Server 1000IP Phones FundamentalsNN43001-368 02.01 StandardRelease 5.0 7 December 2007Copyright © 2003–2007, Nortel Networks.
