Draytek Vigor 2950Gi User's Guide download pdf (Page 136)

Vigor2930 Series User’s Guide

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The Vigor router will not accept the ISDN dial-in connection if the box of Enable ISDN

Dial-in is not checked.

This submenu only applies to PPP-related VPN connections, such as PPTP, L2TP, L2TP

over IPSec.

Dial-In PPP

Authentication PAP Only

Select this option to force the router to authenticate dial-in

users with the PAP protocol.

PAP or CHAP

Selecting this option means the router will attempt to

authenticate dial-in users with the CHAP protocol first. If the

dial-in user does not support this protocol, it will fall back to

use the PAP protocol for authentication.

Dial-In PPP Encryption

(MPPE Optional MPPE

This option represents that the MPPE encryption method will

be optionally employed in the router for the remote dial-in

user. If the remote dial-in user does not support the MPPE

encryption algorithm, the router will transmit “no MPPE

encrypted packets”. Otherwise, the MPPE encryption scheme

will be used to encrypt the data.

Require MPPE (40/128bits) - Selecting this option will

force the router to encrypt packets by using the MPPE

encryption algorithm. In addition, the remote dial-in user will

use 40-bit to perform encryption prior to using 128-bit for

encryption. In other words, if 128-bit MPPE encryption

method is not available, then 40-bit encryption scheme will

be applied to encrypt the data.

Maximum MPPE - This option indicates that the router will

use the MPPE encryption scheme with maximum bits

(128-bit) to encrypt the data.

Mutual Authentication

(PAP)

The Mutual Authentication function is mainly used to

communicate with other routers or clients who need

bi-directional authentication in order to provide stronger

security, for example, Cisco routers. So you should enable

this function when your peer router requires mutual

authentication. You should further specify the User Name

and Password of the mutual authentication peer.

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Draytek Vigor 2950Gi User's Guide Page 136