Actually, if you use Cisco's VPN client from within Parallels it affects only the connections within Parallels (which can be desirable) no matter how the VPN server is set up.
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IPVanish just made OpenVPN almost three times faster on Windows — but there's a catch
IPVanish added OpenVPN Data Channel Offload (DCO) to its Windows app Internal testing recorded download increases of up to 196% The feature cannot be used at the same time as OpenVPN Scramble IPVanish ...
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