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The VMkernel network device drivers start with a default setting of Autonegotiate. This setting will work correctly with network switches set to autonegotiate. If your switch is configured for a specific speed and duplex setting, you must force the network driver to use the same speed and duplex setting.

If you encounter problems — in particular, very low bandwidth — it is likely that the NIC did not autonegotiate properly and you should configure the speed and duplex settings manually.

To resolve the problem, either change the settings on your switch or change the settings for the VMkernel network device using the VMware Management Interface.

1. Log in to the management interface as root.
2. Click on the Options tab.
3. Click Network Connections.
4. Locate the device you want to reconfigure and choose the appropriate setting from the drop-down list for Configured Speed, Duplex.
5. Click OK.

Note: Changing the network speed settings only takes effect after a reboot.