SNMP can’t get ifspeed on vmWare virtual

trying to set up SNMP on some virtuals for running mrtg graphs. Some of them weren’t working; the mrtg config file has this message:

> ### The following interface is commented out because:
> ### * has no ifSpeed property

I found that the Network adapter needed to be changed (or rather removed and a new one added) from “flexible” to “E1000”, then SNMP works / sees the ifspeed correctly.

I made the change with the machine powered off and the new nic has the same mac.