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A little more information would be helpful:
1) are you doing a site to site VPN or telecommuters?
2) what kind of WAN/Internet hardware do you currently have?
3) what kind of internet access do you have (DSL, T1, ISDN, cable)?
4) how much traffic do you expect to have?
If you are planning to route IPX traffic, then you will need to use GRE for your encryption.
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