Cisco Systems - OL-5109-01

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Contents

CHAPTER 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 ...