ping breaks when using experimental.networkingMode=mirrored and a VPN

[aentwist]

Windows Version

Microsoft Windows [Version 10.0.22621.2715]

WSL Version

WSL version: 2.0.9.0

Are you using WSL 1 or WSL 2?

• WSL 2
• WSL 1

Kernel Version (uname -a)

Linux DESKTOP-VSMCCUF 5.15.133.1-microsoft-standard-WSL2 #1 SMP Thu Oct 5 21:02:42 UTC 2023 x86_64 GNU/Linux

Distro Version (cat /etc/os-release)

PRETTY_NAME="Debian GNU/Linux 12 (bookworm)"

Other Software

NordVPN [wireguard]

Repro Steps

1. enable networkingMode=mirrored
2. connect to VPN
3. ping linux.org

Expected Behavior

0% packet loss

Actual Behavior

100% packet loss

Diagnostic Logs

WslNetworkingLogs-2023-11-21_15-28-40.zip

[aentwist]

networkingMode=mirrored	VPN	ping
yes	yes	no
no	yes	IPv4 only
yes	no	yes

Note that other connectivity works - for example curl google.com and wget https://github.com/Microsoft/WSL/blob/master/CONTRIBUTING.md. It seems to just be ping!

[aentwist]

See Also

• WSL2 , problem with network connection when VPN used (PulseSecure) #5068
• Ping not working in wsl2 debian. #5109
• cannot reach ipv6 only address #4518

[PhyX-Meow]

Same here, I can't connect to proxy client in wsl side.

❯ wget https://images.dmzj.com/w/我又做相同的梦了/第08话/0222\ 副本.jpg
--2023-11-22 14:13:05--  https://images.dmzj.com/w/%E6%88%91%E5%8F%88%E5%81%9A%E7%9B%B8%E5%90%8C%E7%9A%84%E6%A2%A6%E4%BA%86/%E7%AC%AC08%E8%AF%9D/0222%20%E5%89%AF%E6%9C%AC.jpg
Loaded CA certificate '/etc/ssl/certs/ca-certificates.crt'
Resolving localhost (localhost)... ::1, 127.0.0.1
Connecting to localhost (localhost)|::1|:8128... failed: Connection refused.
Connecting to localhost (localhost)|127.0.0.1|:8128...
**get stuck here**

WSL version: 2.0.9.0
Proxy client: clash-for-windows

[aentwist]

NordVPN does not appear to support IPv6 and ping seems to prefer IPv6. Being more explicit and using ping -4 works as expected.