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Why is Net Extender slow when connected to SRA Virtual Appliance?
03/26/2020 
39 People found this article helpful
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Description
Why is Net Extender slow when connected to SRA Virtual Appliance?
Cause
Upgrading to VSphere 5.5 or 6 sometimes will break the fully optimized NIC functionality for the SRA Virtual Appliance
This has been fixed with 8.0.0.3 firmware but also requires some configuration.
Resolution
1. Verify the NIC on your virtual is set to VMXNET 3.
You will need to spin up a new 8.1.0.10-25sv OVA or newer to make use of a new set of NIC drivers.
SMB SSL-VPN: Upgrading SRA virtual appliance from 8.1 (or older) to SMA 8.5 (or newer)
- Once you have the SRA running on 8.1.0.10-25sv or newer you will then change the OS to one that has VMXNET3 and change or delete the NICS from the vSphere client console.
Power down the SRA Virtual Appliance
- Right click on the SRA Virtual Appliance and choose "Edit Settings"
- Click 'VM Options' Tab
- Set 'Guest OS Version' to 'Other 2.6.x Linux (32 Bit)', this will give the option for VMXNET3
- Click 'Virtual Hardware' Tab
If it will allow you to change the current NIC to VMXNET3 switch if not you will need to remove and re-add the NIC with VMXNET3
- Remove "Network adapter 1", "Network adapter 2" etc
- Now re-add the adapters but after choosing "Ethernet Adapter" and clicking "next" you will see a pop up screen that has a drop down menu at the top which is set for "Flexible" by default. Change this to "VMXNET3".
- Now power the SRA Virtual Appliance back up and test Net Extender and you will see the performance is as expected again.
2. Verify the settings on the appliance are not causing High CPU usage.
CPU utilization shows incorrect values, High memory utilization, Logs not showing up, etc.
This can also be caused if the SMA appliance is an edge device not behind a firewall.
3. Verify the firewall in front of the SMA appliance is not running 6.2.6.1-25n or 6.2.7.1-23n.
These firmwares have a known issue with throughput for traffic coming through to the SRA.
If this is the case please open a ticket on the firewall serial referring to Issue ID 180711.
There are two ways to contact technical support:
1. Online: Visit mysonicwall.com. Once logged in select Resources & Support | Support | Create Case.
2. By phone: please use our toll-free number at 1-888-793-2830. Please have your SonicWall serial number available to create a new support case.
If you do not have a mysonicwall.com account create one for free!
ISSUE ID:
180711
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