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Google Nest Wifi and Pulse VPN

Community Member

I'm getting the run around between my employer and my ISP regarding my network performance while on VPN.  In a nutshell, I'm losing 98% on my bandwidth when I enable VPN.  While on VPN i average between 2-7 Mbps.   Almost unusable.  When I kill the VPN, I'm back up to 120+Mbps.  

Is there a setting in the in the Google software that I should be selecting that I missed?

VPN is Pulse

ISP is Comcast (I pay for 500 Mbps service)

Google Nest Mesh Network (all connections "great")

Any recommendations?  Thx.



Diamond Product Expert
Diamond Product Expert

Hello @Woidyla 

I actually use the Pulse VPN for my employer as well, and I'm on Comcast. I have 400Mbps service, and I just ran a speed test with Pulse VPN connected and without. Without the VPN connected, I got over 450Mbps down and 11Mbps up, while with VPN connected, I got about 350Mbps down and 10Mbps up. So, I am seeing an impact, but it's nowhere near as bad as what you are seeing. I have Google WiFi rather than Nest WiFi, but I don't think that is making a difference here.

I just have a simple cable modem, though – can I ask whether you have a combination modem+router from Comcast? If so, the "double NAT" issue may be causing this problem for you. Specifically, I wonder whether path MTU (maximum transmission unit) discovery is breaking due to the VPN encapsulating full-size packets inside another packet, and the control packets used to discover the smaller MTU aren't getting through both layers of firewall.

If you have a combination modem+router, and you can configure it to be in "bridge" mode, that might be worth a try.

If that's not possible, it might be possible to configure your system to use a slightly smaller MTU that leaves enough room for the VPN wrapper. Something like 1460 bytes instead of the default 1500 bytes? Or maybe even smaller – like 1400 bytes to start with, just to prove whether this is the issue or not, and then you can bump it up from there to figure out where the breakpoint is.

Community Member

I'm having exactly the same problem and look forward to hearing ideas to try.

My VPN is Pulse.

MY ISP is Optimum/Altice (I pay for 300 Mpbs and receive a bit above that)

Google Nest Mesh Network with 4 nodes, all testing "great".