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The original was posted on /r/homenetworking by /u/IWantArchlinux on 2023-12-06 22:52:57+00:00.

I got hired to work from a country called C1, and later I moved to another one, C2. My job is remote, so my company was cool with it. But now, I'm having a big issue connecting to work.

In C2, the internet is fast and stable. I can use commercial VPNs (and my own VPN in C1) with no problem. But when I try to connect to my company's VPN, everything slows down a lot, almost to a stop. My internet speed in C2 is good, around 100 Mbps. But when I connect to work, it drops to almost zero, and the ping is super high at 2000 ms.

My internet in C2 is fiber (100Mbps down & up), and it's very stable. My company uses OpenVPN, and they say C2 is blocking our connection: "We believe that ISPs block OpenVPN traffic through deep package inspection, and they apply a QOS rules to heavily throttle to the point that where it's unusable."

In an attempt to resolve the issue, I rented a VPS in C1 and installed both OpenVPN and WireGuard on it. Here are the outcomes:

• C2 -> OpenVPN -> C1 (20 down, 6 up)
• C2 -> WireGuard -> C1 (40 down, 70 up)

• C2 -> OpenVPN -> C1 -> Work (6 down, 0.8 up)
• C2 -> WireGuard -> C1 -> Work (12 down, 0.2 up)

I've tested with different internet providers quickly, and I've used two routers, both default settings. Nothing work. I cannot figure this out. Can anyone help?

Edit: I already called my ISP twice, and they flat out deny the problem and say everything is working. (tried to talk to other ISPs, but can't reach technical people)

Edit: Here is a tracert to my work's IP address without using their VPN. It doesn't look healhy.