Our scenario is any Mac trying to VNC to a Linux system here on campus. In any case, if you're having performance problems using VNC to access another system (Mac, PC, or Linux) from a system running 10.7 and you have a VPN, try connecting to it and see if it resolves your issues. We haven't deduced the actual problem just yet, but we think we're onto something related to either the virtual interface and/or the statefulness of the VPN connection. There appears to be something about the virtual interface that's created that works whereas using the default en0 (wired) or en1 (wireless) interfaces are problematic. That caused us to try having the system connect to our VPN while on the local campus and sure enough it worked as well. The same laptop on the local network would get absolutely unworkable performance on the local wired or wireless network, but would work just fine over our Cisco VPN (but using the builtin VPN options for the Mac, not the Cisco VPN client) from outside our campus. In testing to make sure our network wasn't part of the problem, we tried to VNC to a system over our VPN from outside our office. These same issues do not exist with Leopard or Snow Leopard. See, for example, this Apple Discussion thread. Here's a workaround for some VNC issues that may appear with Lion.Ī quick search will show a growing list of users having issues with VNC in Lion.
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