| hostname remote | Configures router name which will be used for negotiation purposes when PPP
authentication is enabled. The name of this router is "remote". When configuring
PPP authentication the destination router must have a username of "remote" (this is
case sensitive so it must match exactly) and the same is true in terms of this router
it needs the user name and password of the remote router (see below for further
description)
| username HQ password happy | he username "HQ" is the hostname of the destination router and is referenced
in the dialer map command for authentication purposes. The username is case
sensitive and must match the destination router's hostname exactly.
The password happy is used as the ppp authentication password for the user HQ.
It is also case sensitive and must be the same as the password for username remote
on the HQ router.
| interface ethernet 0 | Shows the interface and its configuration (in this example it is only a header).
This is also a command that changes the current location into the interface defined,
which in this case is ethernet 0. After changing into an interface, you may enter
all needed config commands
| ip address 198.52.211.254 255.255.255.0 | Configures the ip address and subnet mask for interface E0 or ethernet 0
| interface bri 0 | Shows the interface and its configuration (in this example it is only a header).
This is also the command that changes the current location into the interface defined,
which in this case is bri 0. After changing into an interface, you may enter all
needed config commands.
| ip unnumbered ethernet 0 | Enables IP processing on a serial/bri interface without assigning an explicit ip address
to the interface
| encapsulation ppp | Enables ppp encapsulation in order to negotiate ppp
| dialer idle-timeout 300 | This command specifies the idle number in seconds. This is the time the connection
will remain open if no interesting traffic is being routed across this link. The
timer is reset each time an interesting packet is forwarded across the ISDN connection.
The idle-timeout should be set to the same value on both routers. In this example,
the line will drop after 5 consecutive minutes without interesting traffic.
| dialer map ip 198.52.110.254 name HQ broadcast 14085221234 | Dialer map command uses the name of the destination router to authenticate the
dialed router and if authentication is successful will map the bri 0 interface to
the destination router. It will use the phone number at the end of the map statement
to start the call. Again the name of the destination router in this case "HQ" is case sensitive and must match the actual name of the destination router.
Broadcast enables broadcast packets to be forwarded to this address. (i.e. IP, RIP or
IGRP updates)
To use multilink ppp which enables the use of both B channels for traffic you must
enter a second dialer map with the second phone of the destination routers 2nd B channel.
| dialer-group 1 | The dialer-group 1 command associates this interface with the dialer-list 1 definition.
The interface will now consider anything defined in dialer-list 1 as interesting traffic
and initiate a call if there is not a connection already.
| ppp authentication chap | Enables ppp authentication via chap
| ppp multilink | Enables ppp multilink which allows the use of both B channels for traffic.
| ip route 198.52.110.0 255.255.255.0 198.52.110.254 |
| ip route 198.52.110.254 255.255.255.255 BRI0 | Creates a static route to the network 198.52.110.0. This is a global command
entered at the "router name(config)#" prompt and is not valid at the interface prompt.
| dialer-list 1 protocol ip permit | This command defines a dialer list to control dialing by protocol or by a comination of
protocol and access list. This is a global command entered at the "router name(config)#"
prompt
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