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Building a VPN with existing hardware

We currently have a 1720 Router with one DSU/CSU T1 Serial Interface and one FastEthernet Interface. Our T1 interface is connected directly to our ISP/Internet. The FastEthernet connection is our DMZ and is attached to a hub. Our Proxy Server, Web Server is also attached to the hub. We have a second 1720 Router with the VPN/IOS bundle. It has one FastEthernet Interface and one DSU/CSU T1 Module.

I'm having a tough time designing our VPN solution with our existing equipment given the fact that both 1720's have only one Ethernet port. Is there something obvious that I'm missing? I'd like to see some standard design diagrams for VPN if anyone has some.


Carl Lovejoy


Re: Building a VPN with existing hardware

Since there has been no response to your post, it appears to be either too complex for other forum members to assist you. If you don't get a suitable response to your post, you may wish to review our resources at the online You may also contact our product information line at 1-800-553-NETS or a Cisco Systems Engineer at your local Cisco office or reseller. To locate your local Cisco representative, visit

If anyone else in the forum has some advice, please reply to this thread.

Thank you for posting.

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