Consider the case of the Cisco Systems Inc.'s VPN Concentrators. The networking giant's entry-level model, the...
VPN 3005, can handle 4 Mbps of throughput divided among up to 100 different site-to-site tunnels. You can buy the product for a couple of thousand dollars. As with most networking products, expect to spend about 15-20% of that money on annual support and maintenance.
Regarding staff resources, IPsec VPN tunnels tend to be fairly low maintenance. Technology exists to automatically reestablish broken sessions, and technical support is rarely needed for site-to-site VPNs. I've seen connections remain established for months without a hitch.
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