/etc/systemd/system/network-mirrored.service

network-mirrored.service

[Unit]
Wants=network-pre.target
Before=network-pre.target shutdown.target

[Service]
User=root
ExecStart=/bin/sh -ec '\
  [ -x /usr/bin/wslinfo ] && [ "$(/usr/bin/wslinfo --networking-mode)" = "mirrored" ] || exit 0;\
  echo "\
  add chain   ip nat WSLPREROUTING { type nat hook prerouting priority dstnat - 1; policy accept; };\
  insert rule ip nat WSLPREROUTING iif loopback0  ip daddr 127.0.0.1 counter dnat to 127.0.0.1 comment mirrored;\
  "|nft -f -\
'
ExecStop=/bin/sh -ec '\
  [ -x /usr/bin/wslinfo ] && [ "$(/usr/bin/wslinfo --networking-mode)" = "mirrored" ] || exit 0;\
  for chain in "ip nat WSLPREROUTING";\
  do\
    handle=$(nft -a list chain $chain | sed -En "s/^.*comment \\"mirrored\\" # handle ([0-9]+)$/\\1/p");\
    for n in $handle; do echo "delete rule $chain handle $n"; done;\
  done|nft -f -\
'
RemainAfterExit=yes
[Install]
WantedBy=multi-user.target

you can try it.

$ sudo systemctl --now enable network-mirrored

Very grateful for this, spent countless hours trying to figure it out, no amount of gpt could save me.

this script is no longer needed.

please use Docker 27.3.0 or later.