Setup PAP / CHAP secrets or try noauth switch to pppd. Or put following lines in
/etc/ppp/peers/vpn
---
noauth
name vpn
---
and call pppd with argument 'call vpn'
read man pppd for details.
Amish.
The error I'm getting as below.
/usr/sbin/pppd: The remote system is required to authenticate itself
/usr/sbin/pppd: but I couldn't find any suitable secret (password) for it to use
to do so.
/usr/sbin/pppd: (None of the available passwords would
let it use an IP
address.)