3Com MSR 50 Series, Руководство по настройке

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370 C
HAPTER
19: PPP
AND
MP C
ONFIGURATION
Configuring PPP
Negotiation
Introduction to PPP negotiation parameters
PPP negotiation parameters include: timeout interval negotiation, IP address
negotiation and DNS address negotiation.
Timeout interval negotiation: In PPP negotiation, if, during the timeout interval,
the local device does not receive the response packet from the peer, PPP will
resend the last packet. The time ranges from 1 to 10 seconds.
IP address negotiation can be implemented in the following two ways:
■
Configure the device as client: when the local interface, with PPP encapsulated,
is not configured with an IP address, whereas its peer is configured with an IP
address, you can configure IP address negotiation for the local interface so that
it can receive IP address allocated from its peer. This configuration applies to
the situation when you access internet via ISP, and obtain an IP address from
the ISP.
■
Configure the device as server: If the device is configured as a server to allocate
IP address for its peer, you should first configure a local IP address pool in
domain view or system view, indicate the scope of the address pool, and then
specify the address pool used for the interface in interface view.
In PPP address negotiation, a device can also be configured to negotiate DNS
address, through which the device can either allocate DNS address to the peer, or
receive DNS address from the peer. Generally speaking, if the device is connected
with a PC through PPP, you should configure the device to allocate DNS address
for the peer. In doing so, the PC can access the Internet directly using the domain
name. Or, if the device is connected with an access server of a carrier through PPP,
you should configure the device to accept or actively request a DNS address from
its peer. In this way, the device can use the DNS address allocated by the access
server to resolve domain name.
Configuring PPP negotiation parameters
Follow these steps to configure PPP negotiation parameters:
Enter the specified interface view interface
interface-type
interface-number
-
Configure local username ppp chap user
username
Required
Configure local user
and its corresponding
password Exit to system view quit -
Create local user, and
enter local user view local-user
username
Optional
Configure local user’s
password password { cipher |
simple } password
Optional
Configure the default
CHAP authentication
password Configure the default
CHAP password when
implementing CHAP
authentication ppp chap
password
{ cipher |
simple } password
Optional
To do...
Use the
command... Remarks