Avaya Configuring SNMP, BOOTP, DHCP, and RARP Services Manual de usuario descargar pdf (Pagina 68)

Configuring SNMP, BOOTP, DHCP, and RARP Services

2-6

You conﬁgure this type of ﬁlter by setting the Pass Through Mode parameter. This

parameter appears in several windows you use to conﬁgure BOOTP services. The

default setting is BOOTP and allows the interface to transmit only BOOTP

packets. Be sure to change the setting if you want to transmit DHCP messages.

Improving the Efﬁciency of Packet Relay

You can improve the efﬁciency of the BOOTP packet relay process by

• Specifying the addresses of BOOTP servers

• Using trafﬁc ﬁlters

Specifying BOOTP Servers

You specify a BOOTP server by assigning a particular BOOTP server to an output

interface in the BOOT Relay Agent Preferred Server Table window (refer to

Figure 2-9). For instructions about this procedure, refer to “Specifying Servers for

BOOTP Services,” later in this chapter.

In the BOOT Relay Agent Preferred Server Table window (refer to Figure 2-10),

you enter the IP address of the input interface on the router and the IP address of

the BOOTP server. The router can then unicast a BOOTREQUEST packet

through normal IP services to that server.

Using Trafﬁc Filters

For instructions on conﬁguring trafﬁc ﬁlters (not supported by BNX software),

refer to Conﬁguring Trafﬁc Filters and Protocol Prioritization. The following

example illustrates how you can use a trafﬁc ﬁlter to enhance BOOTP operation.

Example

Consider a network segment that has two types of clients: one set that should boot

using only servers on the local network and another set that should boot from

remote servers. You could set up a trafﬁc ﬁlter to drop any BOOTREQUEST

packets from the ﬁrst set, as follows:

• Protocol: User Datagram Protocol (UDP)

• UDP destination port: BOOTP server

• User-deﬁned ﬁeld for the client hardware address in the BOOTP header: all

MAC addresses of clients in the local group

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Avaya Configuring SNMP, BOOTP, DHCP, and RARP Services Manual de usuario Pagina 68