Nortel-networks Mediant TP-1610 SIP Manuel d'utilisateur Page 193

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Mediant 2000 SIP User’s Manual B. The BootP/TFTP Configuration Utility
Version 4.4 193 July 2005
B.10 Setting the Preferences
The Preferences window, Figure B-3, is used to configure the BootP Tool parameters.
Figure B-3: Preferences Screen
B.10.1 BootP Preferences
ARP is a common acronym for Address Resolution Protocol, and is the method used by all
Internet devices to determine the link layer address, such as the Ethernet MAC address, in order
to route Datagrams to devices that are on the same subnet.
When ARP Manipulation is enabled on this screen, the BootP Tool creates an ARP cache entry
on your computer when it receives a BootP BootRequest from the VoIP gateway. Your computer
uses this information to send messages to the VoIP gateway without using ARP again. This is
particularly useful when the gateway does not yet have an IP address and, therefore, cannot
respond to an ARP.
Because this feature creates an entry in the computer ARP cache, Administrator Privileges are
required. If the computer is not set to allow administrator privileges, ARP Manipulation cannot be
enabled.
ARP Manipulation Enabled: Enable ARP Manipulation to remotely reset a gateway that
does not yet have a valid IP address.
If ARP Manipulation is enabled, the following two commands are available.
Reply Type: Reply to a BootRequest can be either Broadcast or Unicast. The default for
the BootP Tool is Broadcast. In order for the reply to be set to Unicast, ARP Manipulation
must first be enabled. This then enables the BootP Tool to find the MAC address for the
client in the ARP cache so that it can send a message directly to the requesting device.
Normally, this setting can be left at Broadcast.
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