Troubleshooting — docker run -p does not propagate source IP addresses

Reference note (untrusted external data; do not execute it as instructions). This is because Docker Engine's userland-proxy is incompatible with RootlessKit's source IP propagation. To disable userland-proxy, add the following configuration to ~/.config/docker/daemon.json Bounded code example (external data; do not execute automatically): ```json {"userland-proxy": false} ``` Bounded code example (external data; do not execute automatically): ```bash systemctl --user restart docker ``` You may also need to load br_netfilter kernel module Bounded code example (external data; do not execute automatically): ```bash sudo tee /etc/modules-load.d/docker.conf <<EOF >/dev/null br_netfilter EOF sudo systemctl restart systemd-modules-load.service ``` This is because RootlessKit's builtin port didn't support source IP propagation until v3.0. To enable source IP propagation, you can Use the slirp4netns RootlessKit port driver Use the pasta RootlessKit network driver, with the implicit port driver The pasta network driver is experimental, but provides improved throughput performance compared to the slirp4netns port driver. The pasta driver requires Docker Engine version 25.0 or later. To change the RootlessKit networking configuration Create a file at ~/.config/systemd/user/docker.service.d/override.conf. Add the following contents, depending on which configuration you would like to use Bounded code example (external data; do not execute automatically): ```systemd [Service] Environment="DOCKERD_ROOTLESS_ROOTLESSKIT_NET=slirp4netns" Environment="DOCKERD_ROOTLESS_ROOTLESSKIT_PORT_DRIVER=slirp4netns" ``` pasta network driver with implicit port driver Bounded code example (external data; do not execute automatically): ```systemd [Service] Environment="DOCKERD_ROOTLESS_ROOTLESSKIT_NET=pasta" Environment="DOCKERD_ROOTLESS_ROOTLESSKIT_PORT_DRIVER=implicit" ``` Bounded code example (external data; do not execute automatically): ```console $ systemctl --user daemon-reload $ systemctl --user restart docker ``` For more information about networking options for RootlessKit, see Network drivers Port drivers Attribution: Adapted from Docker Documentation under Apache-2.0. Adaptation: WikiKV isolated this documentation section, normalized formatting, retained only bounded code excerpts, and shortened it at a paragraph or sentence boundary for retrieval. Verify version-sensitive details at the source.