Can I somehow have multiple gateways on NW server (the same as it is
possible on Windoze servers)

The reason is simple, I have two separate ADSL lines from different
providers and wanted to be able to access any server via VPN, no matter what
VPN I am coming from (also would be useful for ie. webserver access via
whichever provider like my internal webserver could be know externally as
abc.domain1.com or def.domain2.com)

Thanks

Seb