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I am trying to run Debian 7.1 64 bit as guest OS in VMware Fusion Professional 5 on a Mac Mini with Mac OSX 10.8 as host OS. Hardware and software are the respective most recent versions and I am using the default VM configuration, except for the VM using 4 CPU cores and 4096MB RAM; there is a total of 16GB RAM in the host machine. The network is configured as Bridged (AutoDetect), WiFi on the Mac Mini is switched off, there is a single wired network connection.

Initially, network connectivity is OK. However, after about 20 minutes of inactivity in the host OS, the guest OS network goes down, comes back up a couple of seconds later and then keeps going up and down endlessly. Working on the guest machine over SSH is not possible. In the guest system log, this looks like this:

Aug  7 10:54:53 vm-dev kernel: [   12.657023] ADDRCONF(NETDEV_UP): eth0: link is not ready
Aug  7 10:54:53 vm-dev kernel: [   12.657232] ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
Aug  7 10:55:03 vm-dev kernel: [   23.108833] eth0: no IPv6 routers present
Aug  7 11:21:47 vm-dev kernel: [ 1625.214733] e1000: eth0 NIC Link is Down
Aug  7 11:21:55 vm-dev kernel: [ 1631.220796] e1000: eth0 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: None
Aug  7 11:22:17 vm-dev kernel: [ 1653.252338] e1000: eth0 NIC Link is Down
Aug  7 11:22:21 vm-dev kernel: [ 1657.258376] e1000: eth0 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: None
... (keeps repeating) ...

The fact that the first 'network down' incident always seems to occur after about 20 minutes make me think that this is related to power saving on the host machine, so I tried activating 'Pass power status to VM' in the VM advanced configuration, but the error persists.

The up/down cycle seems to run in regular intervals, so I am pretty sure this is not related to faulty hardware.

Does anyone have some advice for me where to start searching for the cause ?

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migrated from serverfault.com Aug 7 '13 at 10:40

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