ASUSWRT_2020,
While I have some waiting to do at a cafeteria, I decided to do a test of Instant Guard, comparing with OpenVPN Connect and native IPSec VPN on my iPhoneXsMax over 4G Cellular connection. I found the following issue with Instant Guard, I thought easier to show you the video screen shoot.
To provide some context, I am sitting at the same spot doing these 4 speedtest around the same time on the same iPhoneXsMax:
(1) IPhone 4G Direct:
View attachment 27373
(2) IPhone 4G using OpenVPN Connect:
View attachment 27374
(3) iPhone 4G using native IPSec VPN
View attachment 27375
(4) iPhone 4G using Instant Guard (which failed to connect)
drive.google.com
Edit1: I have sent feedback from Instant Guard App
Edit2: Appears that my 4G Cellular upload speed was too low (about 2 mbps) when Instant Guard failed to connect. I can confirm that when upload speed is higher, Instant Guard connects correct. Point is, in the same scenario, both OpenVPN Connect and native IPSec VPN is able to establish connection. Thanks for looking into this.