Wednesday, July 8, 2015

Changing VMware Fusion DHCP Lease Times

At any one time, I've got a dozen or so virtual machines that I might want to boot a subset of.  Monday and Tuesday I might need one bunch, but Wednesday through Friday another.  VMware Fusion's default lease time is a day, which means frequently those early-week machines are assigned IPs that the later-in-the-week machines were previously using.  Flip-flop batches and they collide.

Well, you can change the default and maximum lease times that Fusion gives out to guests by using the `vmnet-cfgcli` command.  It's pretty easy, and you do it on a per-vmnet basis.  To query the current values, for example on the NAT vmnet8 device, goes like this:

  sudo /Applications/VMware\ getdhcpparam vmnet8 defleasetime
  sudo /Applications/VMware\ getdhcpparam vmnet8 maxleasetime

And you set the values, again with an example on the NAT network, like this:

  sudo /Applications/VMware\ setdhcpparam vmnet8 defleasetime <seconds>
  sudo /Applications/VMware\ setdhcpparam vmnet8 maxleasetime <seconds>

Restart VMware Fusion and you're all set.  Machines requesting a new lease will now receive one with the updated settings.  By the way, a week is 604800 seconds.

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