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Cisco 1720 and cable internet

I have a new client who has 4 offices.  They have a Cisco 1720 router at each office, with point to point T-1 circuits from one office to the nest.  We would like to get rid of the T-1 circuits and put cable internet lines into each office, and then configure VPN's from each of the three branch offices back to the main office.  Can the Cisco 1720 be configured to work with cable internent service?  
Also, what is necessary to to set them up in the VPN configuration?

1 Solution
Yes, the 1720 can be adapted. You can add in a WIC-1E Ethernet interface, upgrade to IPSEC Feature set in the IOS (might also require memory upgrade), and you're done. However, the cost of all of those upgrades is pretty high for what you get. You might consider using something like the Linksys RVOx2 series router/firewalls with VPN capability.  Else look at using a PIX 500 series firewall. Probably the 501 would be less $$ than upgrading the 1700 router and it comes with VPN capability built in, no extras required.

tmckinney01Author Commented:
Thanks - exactly what I needed to know.
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