Did you try reading /etc/ppp/ppp.conf.sample?
With the usermode 'ppp' (instead of pppd)
See the 'loop-in' and 'sloop' stanzas.
Since you asked.
0) Unless it is part of your job to setup VPN connectivity, you'll probably
be in violation of your terms of employment. Have you considered using
the official VPN solution at your place of employment?
1) PPP over any TCP connection (including ssh) isn't neccesarily the
2) Current versions of openssh can do dynamic port forwarding
ala SOCKS4 (See the -D <port> option)
3) If the corporate firewall passes UDP, consider trying OpenVPN.
"earthly insanity/brings us conformity
the tinkling bells call me/it plays a leading role
I never could foresee/the purity you stole" -- arte.fa(t's 'Purification'