User's Manual

54 Nortel IP Phone 2001

9 Restart the IP Phone. The firmware settings are read and are

applied to UPLINK and the PC Ethernet Port.

--End--

When the IP Phone restarts, the firmware reads the setting for Full Duplex

mode and sets the LAN Ethernet port, duplex, and speed accordingly.

Use Procedure 6 “Checking Ethernet Statistics” (page 54) to confirm

activation of Full Duplex mode.

Procedure 6

Checking Ethernet Statistics

Step Action

1 Double-click the Services key. The Network Diagnostics menu

appears.

2 Select Ethernet Statistics.

• If Full Duplex mode is active, the following is displayed:

— Link: UP

— Duplex: Full

— Speed: 10 (Mb) or 100(Mb)

— Auto-Negotiate Capability: N

— Auto-Negotiate Completed: N

--End--

Gratuitous Address Resolution Protocol Protection

Gratuitous Address Resolution Protocol (GARP) Protection prevents the

IP Phone 2001 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. The

malicious device launches 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 3

“Installing the IP Phone 2001 using manual configuration” (page 40) or

Procedure 4 “Installing an IP Phone 2001 using DHCP” (page 46).

Nortel Communication Server 1000

IP Phones Fundamentals

NN43001-368 02.07

5 February 2009