Ppp General Setup - Draytek Vigor2830 Series User Manual

4 . 1 0 . 4 P P P G e n e
4 . 1 0 . 4 P P P G e n e
This submenu only applies to PPP-related VPN connections, such as PPTP, L2TP, L2TP over
IPSec.
Dial-In PPP
Authentication
Dial-In PPP Encryption
(MPPE)
Mutual Authentication
(PAP)
r a l S e t u p
r a l S e t u p
PAP Only - elect 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.
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.
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.
217
Vigor2830 Series User's Guide