Changing user-mode-networking leads to DNS broken on Windows WSL

Issue Description

If you set user mode networking then reset it, DNS is broken

Steps to reproduce the issue

podman machine init --now ==> OK
podman pull fedora:40 ==> OK
podman machine stop ==> OK
podman machine set --user-mode-networking ==> OK
podman machine start ==> OK
podman pull fedora:40 ==> OK
podman machine stop ==> OK
podman machine set --user-mode-networking=false ==> OK
podman machine start ==> OK
podman pull fedora:40 ==> KO

Describe the results you received

This is the error at step 10:


Trying to pull registry.fedoraproject.org/fedora:40...
Error: initializing source docker://registry.fedoraproject.org/fedora:40: pinging container registry registry.fedoraproject.org: Get "https://registry.fedoraproject.org/v2/": dial tcp: lookup registry.fedoraproject.org: Temporary failure in name resolution

Also please note that podman machine ssh cat /etc/resolv.conf gives:

cat: /etc/resolv.conf: No such file or directory

Describe the results you expected

DNS should be working

podman info output

host:
  arch: amd64
  buildahVersion: 1.37.2
  cgroupControllers: []
  cgroupManager: cgroupfs
  cgroupVersion: v1
  conmon:
    package: conmon-2.1.12-2.fc40.x86_64
    path: /usr/bin/conmon
    version: 'conmon version 2.1.12, commit: '
  cpuUtilization:
    idlePercent: 99.75
    systemPercent: 0.13
    userPercent: 0.12
  cpus: 12
  databaseBackend: sqlite
  distribution:
    distribution: fedora
    variant: container
    version: "40"
  eventLogger: journald
  freeLocks: 2048
  hostname: DESKTOP-JEFF
  idMappings:
    gidmap:
    - container_id: 0
      host_id: 1000
      size: 1
    - container_id: 1
      host_id: 524288
      size: 65536
    uidmap:
    - container_id: 0
      host_id: 1000
      size: 1
    - container_id: 1
      host_id: 524288
      size: 65536
  kernel: 5.15.153.1-microsoft-standard-WSL2
  linkmode: dynamic
  logDriver: journald
  memFree: 16043687936
  memTotal: 16646332416
  networkBackend: netavark
  networkBackendInfo:
    backend: netavark
    dns:
      package: aardvark-dns-1.12.2-2.fc40.x86_64
      path: /usr/libexec/podman/aardvark-dns
      version: aardvark-dns 1.12.2
    package: netavark-1.12.2-1.fc40.x86_64
    path: /usr/libexec/podman/netavark
    version: netavark 1.12.2
  ociRuntime:
    name: crun
    package: crun-1.17-1.fc40.x86_64
    path: /usr/bin/crun
    version: |-
      crun version 1.17
      commit: 000fa0d4eeed8938301f3bcf8206405315bc1017
      rundir: /run/user/1000/crun
      spec: 1.0.0
      +SYSTEMD +SELINUX +APPARMOR +CAP +SECCOMP +EBPF +CRIU +LIBKRUN +WASM:wasmedge +YAJL
  os: linux
  pasta:
    executable: /usr/bin/pasta
    package: passt-0^20240906.g6b38f07-1.fc40.x86_64
    version: |
      pasta 0^20240906.g6b38f07-1.fc40.x86_64
      Copyright Red Hat
      GNU General Public License, version 2 or later
        <https://www.gnu.org/licenses/old-licenses/gpl-2.0.html>
      This is free software: you are free to change and redistribute it.
      There is NO WARRANTY, to the extent permitted by law.
  remoteSocket:
    exists: true
    path: /run/user/1000/podman/podman.sock
  rootlessNetworkCmd: pasta
  security:
    apparmorEnabled: false
    capabilities: CAP_CHOWN,CAP_DAC_OVERRIDE,CAP_FOWNER,CAP_FSETID,CAP_KILL,CAP_NET_BIND_SERVICE,CAP_SETFCAP,CAP_SETGID,CAP_SETPCAP,CAP_SETUID,CAP_SYS_CHROOT
    rootless: true
    seccompEnabled: true
    seccompProfilePath: /usr/share/containers/seccomp.json
    selinuxEnabled: false
  serviceIsRemote: true
  slirp4netns:
    executable: ""
    package: ""
    version: ""
  swapFree: 4294967296
  swapTotal: 4294967296
  uptime: 0h 15m 17.00s
  variant: ""
plugins:
  authorization: null
  log:
  - k8s-file
  - none
  - passthrough
  - journald
  network:
  - bridge
  - macvlan
  - ipvlan
  volume:
  - local
registries:
  search:
  - docker.io
store:
  configFile: /home/user/.config/containers/storage.conf
  containerStore:
    number: 0
    paused: 0
    running: 0
    stopped: 0
  graphDriverName: overlay
  graphOptions: {}
  graphRoot: /home/user/.local/share/containers/storage
  graphRootAllocated: 1081101176832
  graphRootUsed: 1077084160
  graphStatus:
    Backing Filesystem: extfs
    Native Overlay Diff: "true"
    Supports d_type: "true"
    Supports shifting: "false"
    Supports volatile: "true"
    Using metacopy: "false"
  imageCopyTmpDir: /var/tmp
  imageStore:
    number: 1
  runRoot: /run/user/1000/containers
  transientStore: false
  volumePath: /home/user/.local/share/containers/storage/volumes
version:
  APIVersion: 5.2.2
  Built: 1724198400
  BuiltTime: Wed Aug 21 02:00:00 2024
  GitCommit: ""
  GoVersion: go1.22.6
  Os: linux
  OsArch: linux/amd64
  Version: 5.2.2

Podman in a container

Privileged Or Rootless

Rootless

Upstream Latest Release

Yes

Additional environment details

Win11Pro Podman 5.2.2 installed

Additional information

Additional information like issue happens only occasionally or issue happens with a particular architecture or on a particular setting

containers / podman

Changing user-mode-networking leads to DNS broken on Windows WSL #24061