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SNMP Bandwidth Disrepancy?

I've noticed this issue since installing the first verion of UTM v9...

The measured bandwidth on the UTM interfaces don't seem to agree.  These appear to be off by a consistent percentage, so as the bandwidth usage increases, the difference increases proportionately.

Just to set the stage, I'm running Sophos UTM v9 (always latest version) on VMware ESX 5.5 with two interfaces... Internal and External (internet-facing).  The ISP service maximum is 50Mbit (verified through previous testing).

When downloading a file to an internal host from an external internet simple FTP server, Sophos UTM is indicating a download speed of 60Mbit on the external internet NIC and 47Mbit on the internal NIC.  These numbers are witnessed on the webmin dashboard, as well as through an external SNMP polling application.

Any idea why the difference?  Is this a known bug?

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0 AdminDDC over 10 years ago

After doing some digging, I discovered that the VM was configured with the E1000 virtual NIC drivers. Switching them to VMXNET3 has completely solved the issue. To ensure a clean change, I backed up the UTM configuration and then rebuilt the VM with the proper drivers and restored the configuration-- couldn't have gone any smoother.
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0 BarryG over 10 years ago

Thanks for the update!

Barry
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SNMP Bandwidth Disrepancy?

Submitted a Tech Support Case lately from the Support Portal?