@merakiel there isn't a specific requirement, it depends on what the users will be accessing over the VPN link. If you have 50x users accessing Citrix then a 10Mb connection would probably suffice, but if they are all accessing GPU accelerated VDIs then 100Mb might not be enough. If the users have fat clients then the data usage will be bursty so I'd say 50Mb would usually be enough, but as always, the more the merrier!
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