My employer uses Cisco AnyConnect VPN software, which I need to use whenever working from home. I have never had any issues in the past, using a ZyXEL NBG4615 router with my Comcast cable modem.
A few weeks ago, after modifying some router settings, I was suddenly no longer able to get anything to work after connecting to VPN. The computer can access the internet just fine prior to connecting to VPN, and has no problems making the VPN connection, but once it connects to VPN the connection grinds to a halt. It is still connected, but data transfers are so slow that most everything times out. I can occasionally retrieve emails or perform less data-intensive tasks, but even loading a website is impossible.
After several hours of debugging, I have now discovered that turning off the "Bandwidth Management" setting of my router is what broke the VPN connection. I turned it back on and everything went back to normal. I really don't want this setting turned on, but I can live with it if that is the only way to work through VPN.
What I came here to ask is whether anyone can explain why "Bandwidth Management" would have any impact whatsoever on VPN? There is no other significant activity on my network, so why should it make any difference one way or another? Is there a good technical explanation for this, or is it possibly some strange quirk of my router firmware?
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weird issue router cisco anyconnect vpn