User`s guide

Vigor2710 Series User’s Guide
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This submenu only applies to PPP-related VPN connections, such as PPTP, L2TP, L2TP
over IPSec.
Available settings are explained as follows:
Item Description
Dial-In PPP
Authentication
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.