Secure Gateway??

[syvehc]

I would like to create a gateway between two networks. Let me call one network Y and the other Z. Network Y is a closed off line Microsoft network that is unpatched and totally vulnerable. Network Z is a mixed environment with full access to internet. Network Z is behind a corporate firewall so I think it may be ok to use FTP. I need to FTP some data from Network Y to network Z using a gateway. Network Y will receive no data from network Z only send it out.

I was thinking of using an PFSense PC to act as the gateway PC but I am unsure how to properly lock this system down so it doesn't carry anything over. Any ideas would be appreciated.

Thanks
Tom