Networks
by sgt_shultz
by zaferus
Yes, a VPN is by far your best solution.
Each network (city) will have to have a unique subnet, or your VPN will become a routing nightmare. Also VPNs and VLANs usually don't mix very well.
Make sure you get a firewall that can handle the load (like a Pix or Sonicwall).
Use AES or 3DES encryption, and IKE keys that are renegotiated every 8 hours. Either SHA1 or MD5 hashes will be fine as well.
If you are pulling large amounts of data through the VPN, consider using a thin client (Terminal Services/Citrix) solution.
Zaf
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