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I connected my university-vpn via openvpn on Windows, Ubuntu and Manjaro.

Windows worked instantly, no configuration was needed.

When using any Linux-System, connecting to the vpn seems to work but when requesting a website (inside or outside of the network I am in) it looks like I am stuck in an endless loop.

Right now I am on Manjaro.

OpenVpn-File:

client
dev tun

proto tcp

connect-timeout 20
remote serverFooBar 1195 #correct server is set here

remote-cert-tls server
auth-user-pass

# the option 'block-outside-dns' is for windows only
# ignore-unknown-option block-outside-dns
# block-outside-dns

route-metric 1
push-peer-info

<ca>
-----BEGIN CERTIFICATE-----
Here is the Certificate
-----END CERTIFICATE-----
</ca>

The result of traceroute is the following:

traceroute link.springer.com
traceroute to link.springer.com (172.23.255.252), 30 hops max, 60 byte packets
 1  172.23.255.252 (172.23.255.252)  43.817 ms  3036.501 ms  3065.505 ms
 2  172.23.255.252 (172.23.255.252)  4035.637 ms  4063.329 ms  4063.283 ms
 3  172.23.255.252 (172.23.255.252)  4063.306 ms  4063.299 ms  4063.293 ms
 4  172.23.255.252 (172.23.255.252)  4063.298 ms  4063.270 ms  4063.275 ms
 5  * * *
...
30  * * *

resolv.conf sets the dns server correctly too

nameserver 172.25.0.1
nameserver myIPv6Adress
nameserver 192.168.0.1

I suspected the network card to be incompatible with the OS

02:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8211/8411 PCI Express Gigabit Ethernet Controller (rev 10)
03:00.0 Network controller: Intel Corporation Wi-Fi 6 AX200 (rev 1a)

Additional hardware information:

cpu:
  AMD Ryzen 5 4500U with Radeon Graphics

network:
  wlp3s0               Intel Wi-Fi 6 AX200
  enp2s0               Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller

network interface:
  lo                   Loopback network interface
  wlp3s0               Ethernet network interface
  enp2s0               Ethernet network interface
  docker0              Ethernet network interface

bridge:
                       AMD Renoir PCIe Dummy Host Bridge
                       AMD Renoir Device 24: Function 3
                       AMD Renoir Device 24: Function 1
                       AMD Renoir PCIe Dummy Host Bridge
                       AMD Renoir PCIe GPP Bridge
                       AMD FCH LPC Bridge
                       AMD Renoir PCIe GPP Bridge
                       AMD Renoir Device 24: Function 6
                       AMD Renoir Root Complex
                       AMD Renoir Internal PCIe GPP Bridge to Bus
                       AMD Renoir Device 24: Function 4
                       AMD Renoir Device 24: Function 2
                       AMD Renoir PCIe GPP Bridge
                       AMD Renoir Device 24: Function 0
                       AMD Renoir PCIe GPP Bridge
                       AMD Renoir PCIe Dummy Host Bridge
                       AMD Renoir Device 24: Function 7
                       AMD Renoir Device 24: Function 5

As a Linux-Novice I am out of options to debug this.

Any help is appreciated.

Improve this question
4
  • That traceroute does not look healthy. What are the routes (ip route) after you connect OpenVPN? Commented Feb 28, 2024 at 0:16
  • I found out that the main problem has to lay in the DNS. When trying drill link.springer.com @172.25.0.1 it responds with Error: error sending query: Could not send or receive, because of network error my resolv.conf looks ok though ``` # Generated by NetworkManager nameserver 172.25.0.1 nameserver 192.168.0.1 ``` Commented Mar 5, 2024 at 9:02
  • 1
    My guess is that your network error is due to bad routing, but that is only a guess as you have not posted your routes. Commented Mar 5, 2024 at 21:25
  • you were right. I had a look into my routes and set the routes to the network manually. set these and commented out my local dns. Now it's all working! 172.17.0.0/16 dev docker0 proto kernel scope link src 172.17.0.1 linkdown 172.22.255.0/24 via 172.25.84.49 dev tun0 proto static metric 50 172.23.255.0/24 via 172.25.84.49 dev tun0 proto static metric 50 172.25.0.0/24 via 172.25.84.49 dev tun0 proto static metric 50 172.25.84.49 dev tun0 proto static scope link metric 50 172.25.204.133 dev tun0 proto kernel scope link src 172.25.204.134 metric 50 Commented Mar 6, 2024 at 13:30

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