Slow Wireguard Speeds GL-MT1300 (Beryl)

Technical Support for Routers
1

I need some help to figure out and improve Wireguard speeds. I have 2 GL-MT1300 (Beryl) units, 1 serving as Wireguard VPN Server at home and 2nd unit serving as mobile VPN Wireguard client (mainly at vacation home). I have 100 MBPS up and down at both locations. I’m only getting 2 MBPS up and down over VPN.

Following is output of trace rt from client to server (glddns).

1 4 ms 2 ms 1 ms console.gl-inet.com [192.168.8.1]
2 65 ms 59 ms 56 ms 10.0.0.1
3 191 ms 131 ms 66 ms pool-72-83-xxx-yyy.washdc.fios.verizon.net [72.83.xxx.yyy]

I had these configured as OpenVPN and I was getting much better, 8Mbps up and 5Mbps down, but not good enough for video call.

I primarily use work laptop which has corporate Cisco AnyConnect. When connected using Openvpn, everything works. When connected using Wireguard, Outlook doesn’t work. I suspect my Wireguard handshake is not proper/optimized and as such Cisco Anyconnect Tunnel has issues working within Wireguard tunnel. Or, there’s leakage.

I’m not very savvy with this. Please advise how can i troubleshoot or which commands I can run.

Thanks.

2

You can try VPNPOLICY and add Cisco Anyconnect subnet to the exception list

3

What upload and download speeds do you get when connected through WireGuard, but without going through Cisco AnyConnect?

Did you previously use OpenVPN over TCP or UDP?

I do not work for and I am not directly associated with GL.iNet

4

That will defeat the purpose. I want Cisco Traffic to go through Wireguard VPN.

5

OpenVPN was on UDP. Is TCP faster than UDP?

Without Cisco Anyconnect, I get awesome speeds on WIreguard. 50 Mbps Download and 50 Mbps Upload at-least if I recall.

6

On your client/remote wireguard router, try setting the Wireguard MTU to 1280. Having some pages not work is a possible symptom of packets getting fragmented.

7

you can set the MTU of wireguard directly in the vpn dashboard.

8

If you had previously used OpenVPN over TCP, then I would have suggested to try UDP to better speed for video calls because UDP is usually a little faster.

As Eric suggested, setting WireGuard MTU to 1280 is a good idea.