Which protocol does your VPN solution use?
I had my Amiga, using MiamiDx 1.0c, with a working (except that I had to use a http proxy, had a routing problem) setup to a VPN/PPTP server at the university. Basically you must add a pseudo interface - ppp0 - and a VPN dialer. I must say that it was much, much slower than using a standard TCP/IP link (because of the messy MPPE encryption of IP payload).
Search through the
http://www.mail-archive.com/miamidx-talk-ml@h1.nordicglobal.com if you want to learn how to set it up or you can ask in this thread.
Of course you need a valid MiamiDx key for this, since the only VPN option for AmigaOS is provided by MiamiDx.
PPTP is by the way highly insecure. MS-CHAP is very weak.
Edit:
Miamidx.guide gives a PPTP/LT2P howto.
