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RootlessKit port forwarder has a lot of advantages over the slirp4netns port forwarder: * Very high throughput. Benchmark result on Travis: socat: 5.2 Gbps, slirp4netns: 8.3 Gbps, RootlessKit: 27.3 Gbps (https://travis-ci.org/rootless-containers/rootlesskit/builds/597056377) * Connections from the host are treated as 127.0.0.1 rather than 10.0.2.2 in the namespace. No UDP issue (#4586) * No tcp_rmem issue (#4537) * Probably works with IPv6. Even if not, it is trivial to support IPv6. (#4311) * Easily extensible for future support of SCTP * Easily extensible for future support of `lxc-user-nic` SUID network RootlessKit port forwarder has been already adopted as the default port forwarder by Rootless Docker/Moby, and no issue has been reported AFAIK. As the port forwarder is imported as a Go package, no `rootlesskit` binary is required for Podman. Fix #4586 May-fix #4559 Fix #4537 May-fix #4311 See https://github.com/rootless-containers/rootlesskit/blob/v0.7.0/pkg/port/builtin/builtin.go Signed-off-by: Akihiro Suda <akihiro.suda.cz@hco.ntt.co.jp>