Draytek Vigor IPPBX 2820n, Руководство пользователя

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VigorIPPBX 2820 Series User’s Guide 297
6 6 . . 7 7 . . 2 2 P P P P P P G G e e n n e e r r a a l l S S e e t t u u p p
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