Firewall for IIS using virtual servers?

[Christian Schlettig <ceres@mail.isis.de>]

Hello Group,

i'd like to set up a firewall using debian to 'protect' an IIS 5.0/W2K Server with virtual servers.
Should look like this:

  INET  -- 2*2MBit --  LINUX -- IIS

the administrator of my ISP told me that this scenario would not allow virtual servers on the IIS! I doubt that but would 
like to ask someone before setting this up!
Has anyone here similar scenarios running or knows the answer?

Thanks in advance,
 
 yours,
 Christian