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Customizing PPP

308639-14.00 Rev 00

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Specifying the CHAP Secret

If you have enabled CHAP, specify the secret. There is no default value. The

function of the CHAP secret is similar to a password, but its use is slightly

different. Both peers on a link must have the same secret to correctly calculate

responses to challenges either one of them may send to the other during the

authentication process and network-layer negotiation phase. You can assign a text

string up to 20 characters long as the CHAP secret for this interface.

Specifying the CHAP Local Name

A local CHAP name informs the peers of each other’s identity. Specify the CHAP

local name as a text string of up to 20 characters. There is no default value.

If you configure CHAP as an authentication protocol, you must use CHAP Local

Name for router identification on a dial-on-demand, bandwidth-on-demand, or

dial backup line. If you do not configure CHAP, you cannot use CHAP Local

Name for identification; instead, you must configure PAP.

Specifying the CHAP Authentication Challenge Interval

The CHAP Periodic Timer parameter indicates the interval (in seconds) that must

elapse between CHAP challenges. You can specify any number of seconds.

Setting this value to 0 (the default) disables the timer. A reasonable value for this

parameter is 60.

PPP allows repeated authentication challenges at an interval (in seconds) that

either peer on the link can specify. The timer begins counting when an

authentication phase has completed. A new challenge does not begin until the

amount of time you specify elapses.

Enabling PAP Fallback

If the peer sends a configure-NAK packet, rejecting CHAP as the authentication

protocol, and if you have enabled PAP fallback, the router offers PAP as the

authentication protocol. You must also have enabled PAP and provided a PAP

password.

Setting the Enable PAP Fallback parameter to Enable causes a fallback to PAP if

you have selected CHAP as the authentication protocol, but the peer rejects

CHAP. The default value is Disable. Set this parameter to Enable if you mix

authentication types in the same pool.

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Avaya Configuring PPP Services Manual do Utilizador Página 85