Thursday, May 3, 2012

Bridged OpenVPN server on VMware ESXi host

After migrating our virtual firewall from a XenSource to an ESXi server, our bridged OpenVPN server stopped working: users could ping the server, but nothing else.
Since we were talking about Vista clients, we started with the usual suspects: reboot, reinstall TAP driver, reboot. No joy, so I had to start to actually think.

Turns out ESXi vSwitches are not in promiscuous mode by default. You can turn it on like this:

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