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Currently, I have setup on NIC card with two DMZ IP addresses. We are having weird issues with the connection, where sometimes servers aren't accessible.

I have another NIC card other than the current one in the server and I could split the IP addresses between the two cards.

What is the best practice for this? What will minimizes VPN issues?

Just about all the outgoing traffic on that server flows through another NIC on the LAN. Also, the VPN is pretty basic PPTP assigning LAN IPs to the clients.

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Would you mind further describing why you have two DMZ IP's on one server? –  MichelZ Jul 21 '12 at 8:41
that server also is a FTP server and a small web server for downloading documents through a URL. Full disclosure, I'm really just a programmer task with all It tasks so I really suck at networking. –  Joe Tuskan Jul 21 '12 at 14:08

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