Cisco Systems OL-5109-01 User Manual download pdf

CHAPTER

4-1

Cisco IP Phone Authentication and Encryption for Cisco CallManager 4.0(1)

OL-5109-01

Phone Hardening

To tighten security on the phone, you can perform tasks in the Phone

Configuration window of Cisco CallManager Administration.

This chapter contains information on the following topics:

• Disabling the Gratuitous ARP Setting, page 4-1

• Disabling Web Access Setting, page 4-2

• Disabling the PC Voice VLAN Access Setting, page 4-2

• Disabling the Setting Access Setting, page 4-3

• Disabling the PC Port Setting, page 4-3

• Performing Phone Hardening Tasks, page 4-4

Disabling the Gratuitous ARP Setting

By default, Cisco IP Phones accept Gratuitous ARP, or GARP, packets. GARPs,

which are used by devices, announce the presence of the device on the network.

However, attackers can use these packets to spoof a valid network device; for

example, an attacker could send out a GARP that claims to be the default router.

If you choose to do so, you can disable Gratuitous ARP in the Phone

Configuration window of Cisco CallManager Administration.

Note Disabling GARP does not prevent the phone from identifying its default router.

1 2 3 4 5 6

Summary of Contents

Page 1 - Phone Hardening

CHAPTER 4-1Cisco IP Phone Authentication and Encryption for Cisco CallManager 4.0(1)OL-5109-014Phone HardeningTo tighten security on the phone, you ca

Page 2 - Disabling Web Access Setting

Chapter 4 Phone HardeningDisabling Web Access Setting4-2Cisco IP Phone Authentication and Encryption for Cisco CallManager 4.0(1)OL-5109-01Relat

Page 3 - Disabling the PC Port Setting

4-3Cisco IP Phone Authentication and Encryption for Cisco CallManager 4.0(1)OL-5109-01Chapter 4 Phone HardeningDisabling the Setting Access Sett

Page 4 - Procedure

Chapter 4 Phone HardeningPerforming Phone Hardening Tasks4-4Cisco IP Phone Authentication and Encryption for Cisco CallManager 4.0(1)OL-5109-01R

Page 5

4-5Cisco IP Phone Authentication and Encryption for Cisco CallManager 4.0(1)OL-5109-01Chapter 4 Phone HardeningPerforming Phone Hardening TasksS

Page 6 - OL-5109-01

Chapter 4 Phone HardeningPerforming Phone Hardening Tasks4-6Cisco IP Phone Authentication and Encryption for Cisco CallManager 4.0(1)OL-5109-01

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Cisco Systems OL-5109-01 User Manual

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