cisco 857 pptp config

vpdn enable

vpdn-group 1
accept-dialin
protocol pptp
virtual-template 1

interface Virtual-Template1
ip unnumbered BVI1
ip nat inside
ip virtual-reassembly
peer default ip address dhcp-pool LAN
no keepalive
ppp encrypt mppe 128
ppp authentication ms-chap ms-chap-v2 callin