This isn't a function of the VPN client, but a function of your usage. If you connect 2,000 people and use RDP @ 250Kbps then you would need a 500Mb connection (assuming they are all using this steady amount of traffic all at the same time). If you have people using various applications such as Word, Excel, Outlook it will vary. I would suspect that a 200Mbps Internet circuit would be fine. Note: This is a dedicated business class service from an actual ISP (such as Level3) and not a cable company or home user type service (think Comcast/TimeWarner or Verizon Fios). I've never had to limit user speed on the GP vpn. I don't see an easy option.
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