set vpn pptp remote-access authentication mode local
set vpn pptp remote-access client-ip-pool start 172.16.10.220
set vpn pptp remote-access client-ip-pool stop 172.16.10.240
set vpn pptp remote-access authentication local-users username sami password mypass
set vpn pptp remote-access authentication local-users username teri password teripass
 
vyatta@core2# show vpn
 pptp {
     remote-access {
         authentication {
             local-users {
                 username sami {
                     password mypass
                 }
                 username teri {
                     password teripass
                 }
             }
             mode local
         }
         client-ip-pool {
             start 172.16.10.220
             stop 172.16.10.240
         }
     }
 }
[edit]