networkingMode: mirrored not working but virtioproxy does.

[ssantosv]

Windows Version

10.0.19045.3570

WSL Version

2.0.7.0

Are you using WSL 1 or WSL 2?

• WSL 2
• WSL 1

Kernel Version

5.15.133.1-1

Distro Version

Ubuntu 22.04

Other Software

No response

Repro Steps

.wslconfig

networkingMode=virtioproxy

or

networkingMode=mirrored

Expected Behavior

For me, a mirrored network. It des not work.

EventViewer:
"No se admite el modo de red reflejada, revirtiendo a las redes NAT"

Actual Behavior

I think I found a not documented mode that works:

networkingMode=virtioproxy

It shows a new lookback0 interface with a 169 network and eth0 gets the same IP as the host network. Example (redacted)

sergio@desktop:~$ ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
link/ether [redacted] brd ff:ff:ff:ff:ff:ff
altname [redacted]
altname [redacted]
inet 192.168.1.50/24 brd 192.168.1.255 scope global eth0 [THIS IP ADDRES IS THE SAME AS IN WINDOWS]
valid_lft forever preferred_lft forever
inet6 [redacted]/64 scope link
valid_lft forever preferred_lft forever
3: loopback0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
link/ether [redacted] brd ff:ff:ff:ff:ff:ff
altname [redacted]
altname [redacted]
inet 169.254.73.153/30 brd 169.254.73.155 scope global loopback0
valid_lft forever preferred_lft forever
inet6 f[redacted]/64 scope link
valid_lft forever preferred_lft forever

In windows:

Adaptador de Ethernet vEthernet (WSL):

Sufijo DNS específico para la conexión. . :
Vínculo: dirección IPv6 local. . . : fe80::2322:8351:528f:1874%35
Dirección IPv4. . . . . . . . . . . . . . : 172.25.160.1
Máscara de subred . . . . . . . . . . . . : 255.255.240.0
Puerta de enlace predeterminada . . . . . :

Adaptador de LAN inalámbrica Wi-Fi:

Sufijo DNS específico para la conexión. . :
Vínculo: dirección IPv6 local. . . : fe80::f610:a801:c872:99c4%23
Dirección IPv4. . . . . . . . . . . . . . : 192.168.1.50
Máscara de subred . . . . . . . . . . . . : 255.255.255.0
Puerta de enlace predeterminada . . . . . : 192.168.1.1

cat /etc/networks
symbolic names for networks, see networks(5) for more information
link-local 169.254.0.0

If no virtioproxy (no networkingMode swith, so NAT by default).

sergio@desktop:~$ ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1492 qdisc mq state UP group default qlen 1000
link/ether [redacted] brd ff:ff:ff:ff:ff:ff
inet 172.25.173.122/20 brd 172.25.175.255 scope global eth0
valid_lft forever preferred_lft forever
inet6 fe80::215:5dff:fe08:66c7/64 scope link
valid_lft forever preferred_lft forever

So:

• Why is mirrored not working?
• this virtioproxy seems to be a new feature. Virtio is already used in WSL for GPU, but seems to be something is going to be used in networks?

Diagnostic Logs

No response

[zcobol]

@ssantosv you need Windows 11 for mirrored mode. However, on Win 10 here are the options for wsl2.networkingMode: bridged, mirrored, nat, none, virtioproxy. Some work!

[ssantosv]

Yeps, I guessed that it was for Windows 11 only (although it is mentioned in logs, as an option in Windows 10).

But what is really interesting is "virtioproxy". Seems to remain undocumented yet and working in Windows 10. Any information about it?

[ghost]

@ssantosv, as @zcobol says, mirrored is not supported on Win11. I'm having a hard time following your writing. If the issue is that NAT mode is not working, feel free to reopen the bug.