Low download speeds Internet Sophos UTM VM - but only the other virtual machines; Physical PC without issue

So I have something very strange going on. I have a Dell custom host ISO on a Dell R310 ESX 5.5. My problem is that the Internet download is bad, but ONLY to other virtual machines. The Upload is normal physical computers.

I currently have 4 virtual machines running:

FreePBX, Win 2012 R2 Server, Sophos UTM (ISO VMware with the latest updates) and Win8.1 Ent.

I have the following physical machines, I also used for testing:

8.1 Win Office - wired

Win portable 8.1 - wireless

The lower test details, you can see on the image below.

Iperf tests with 64 k window:
Win Server 2012 to VM VM win 8 - 6.8Gbps <-VM VM good xfer
Wireless
Win 8.1 laptop to Win 2012 VM Server - 172Mbps <-VM to the well physical wireless
Desktop 8.1 Win Win Server 2012 VM-619Mbps <-well wired VM

Xfinity speed tests:
Wireless laptop: 90Mbps down, 9Mbps place <-physical good Upload PC speed
Wired Desktop laptop: 90Mbps down, 9Mbps place <-physical good Upload PC speed
Win Server VM: 86Mbps down, place 0.6Mbps <-SLOW on VM!
Win 8 VM: 90Mbps downwards, upwards 0.6Mbps <-SLOW on VM!

As you can see in my tests, the only place the problem presented is VM to the internet. Physics to the internet works fine. My only thought is that there is something with the switch to the host or the MAC address.


I don't think it's the Sophos Nic because it works very well from the physical to Sophos to Internet. I also have a ticket with Sophos Support; they look on the side of Sophos.

Thoughts?

Upload issue.png

I sent Wireshark packet capture of the Sophos support and they had this to say:

This is to inform you of the issue, you face the slow, ask you please see attached screenshot of the capture of packets. We have found the package wth ECN (explicit congestion Notification) and CWR (Congestion window reduced on the VM machine, please get this checked with support of virtual machine or VM adapter. This happens when he fell over packages and the congestion window is reduced, that the issue is not with the UTM.

In addition, indicator of Congestion window reduced (CWR) is defined by the host sender to indicate that it has received a segment TCP with the ECE flag set and that she had responded to the congestion control mechanism that indicates there is a congestion in the patch.

So I did some research and the solution is to disable all options of unloading in the advanced settings of the NIC as shown in these two links:

Cyber Explorer: Improved VM broadband network VM on an ESXi platform

Disable offloading TCP in Windows Server 2012 | Knowledge Center | Rackspace Hosting

This solved my problems. I now cross 9Mbps downloads on my VMs. hope this helps someone else!

Tags: VMware

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