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11-16 Internetwork Design Guide

Dial-on-Demand Routing

AppleTalk Dialer Lists

AppleTalk dialer lists are similar to IP dialer lists. They can be used in two ways: to establish general

protocol access or to call more speciﬁc access lists. The following dialer-list command is a generic

statement that creates dialer list 2 and permits all AppleTalk trafﬁc:

dialer-list 2 protocol AppleTalk permit

The following dialer-list command creates dialer list 6 and calls all extended access lists

numbered 601:

dialer-list 6 protocol appletalk list 601

access-list 601 deny cable-range 7364-7364

access-list 601 permit other-access

The access-list command establishes access lists, which use network-layer ﬁltering to control trafﬁc.

AppleTalk access lists are numbered between 600 and 699. The access-list cable-range command

denies the forwarding of AppleTalk packets from cable range 7364-7364. The access-list

other-access command permits the forwarding of AppleTalk packets from any other cable range.

Some AppleTalk applications send out license management packets that, if not controlled, initiate

unnecessary connections. AppleShare 4.0, for example, sends out license management packets to

ensure that the same copy is not being run elsewhere. The license management packets are broadcast

to each cable range, which inherently include ISDN links. An access list can make the license

management packets uninteresting and prevent them from bringing up the link. The following

commands create an access list that for cable range 7364-7364 makes broadcasts (including license

management packets) uninteresting and all other trafﬁc interesting:

access list 601 permit cable-range 7364-7364 broadcast-deny

access-list 601 deny other-access

To associate a dialer list with a speciﬁc ISDN interface, use the dialer-group interface conﬁguration

command.

Note Because only one dialer-group command is allowed per interface, all of the dialer-list

commands associated with a speciﬁc interface must use the same number.

AppleTalk Dialer Maps

When used in AppleTalk networks, the dialer map interface conﬁguration command associates an

AppleTalk network address with an ISDN number. In addition to specifying the AppleTalk address

of the destination router and the ISDN number to be dialed, the dialer map command speciﬁes the

name of the router that is being called (which, to pass PPP CHAP authentication, must match the

name of the router) and the speed at which the call is to be placed. (Note that the name that is used

in the dialer map statement must also exist as a user name with a password on the local router.) The

following is an example of the dialer map command:

dialer map appletalk 7360.25 name RouterB broadcast 14085551212

The broadcast keyword allows AppleTalk routing updates to cross the ISDN link. If static routes

are being used, the broadcast keyword is not necessary. You can use a combination of snapshot

routing and access lists to prevent connections from being established for the sole purpose of

exchanging protocol updates. See the “Tariff Management” section later in this chapter.

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