Many two factor systems will interface with radius.  Alternatively
running Radiator on the same system you could deal with OATH HOTP.  I
don't know if they have the binary lib for vasco digipass on that
platform, though.

OATH HOTP keys at scale sound like $8/each from what I've heard, perhaps less.

On Tue, Nov 3, 2009 at 11:54 AM, Andrew S. Zbikowski <andyzib at gmail.com> wrote:
> Not Linux nor no-cost, but For $999 there's the Mac Mini w/ Leopard
> Server option:
> http://store.apple.com/us/configure/MC408LL/A?mco=MTMzNzU5Nzc
>
> Out of the box LDAP, Kerberos, RADIUS.
>
> Two-factor auth should be possible but I haven't looked into it myself.
>
> --
> Andrew S. Zbikowski | http://andy.zibnet.us
> IT Outhouse Blog Thing | http://www.itouthouse.com
>
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-- 
Scott Dier <scott at dier.name>