connecting external network options

I need to allow 2 customers to have access to an internal citrix server.  The customers are on site and have their own networks but would now like to link to our network to use our ERP system.  I want to restrict access to only the citrix server and need a least cost option.  a local network company has offered an HP switch that routes as well, but while this offers future expansion it may be a bit on the pricey side.  i was thinking of a multihomed win2k box running rras with a connection into each of their networks and then filtering to only to ip address of the citrix server and only on the citrix port.  any suggestions on how this would work with 3 cards in, or should i look for a hardware solution.  it is possible we will have more people wanting to connect in the near future so needs to be expandable

thanks
dhpjonesAsked:
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aindelicatoCommented:
These are 3 seperate LANS setup in the same office?

You could have them run over the internet and give them the public NAT IP for the citrix server.

If not in your existing router, just setup static routes for the IP traffice you want to allow. You'll then have to cross connect their switch to your switch.  Setting up a DMZ and putting the citrix server on the DMZ would help keep them off you LAN, but have access to the Citrix server.
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MazaraatCommented:
Depending on the router you use, you could set it to allow them access to your network and in an access list restrict them to the Citrix server.  That would probably be easiest, expandable, and leverage the current investment in your router =)(or purchase of one that supports access lists =)
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MazaraatCommented:
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