Binary package “slirp4netns” in ubuntu oracular
User-mode networking for unprivileged network namespaces
slirp4netns provides user-mode networking for unprivileged network
namespaces.
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slirp4netns allows connecting a network namespace to the Internet in a
completely unprivileged way, by connecting a TAP device in a network
namespace to the usermode TCP/IP stack ("slirp").