[Bug 1696746] Re: netdev user, restrict=on prevents forwarded ports from being accessed from other systems

[Thomas Huth]

slirp (i.e. user networking) has been moved to a separate project...
does this problem still persist with the latest version of QEMU? If so,
could you please report it to the libslirp project instead:

https://gitlab.freedesktop.org/slirp/libslirp/-/issues

Thanks!

** Changed in: qemu
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1696746

Title:
  netdev user,restrict=on prevents forwarded ports from being accessed
  from other systems

Status in QEMU:
  Incomplete

Bug description:
  I've got a guest only network and I'm wanting to access SSH on one of the 
guests externally.
  I'm using -netdev user,id=usernet0,hostfwd=tcp::2222-:22,restrict=yes -device 
virtio-net-pci,netdev=usernet0
  to forward 2222 to 22 in the guest.

  The docs state:
  restrict=on|off

      If this option is enabled, the guest will be isolated, i.e. it
  will not be able to contact the host and no guest IP packets will be
  routed over the host to the outside. This option does not affect any
  explicitly set forwarding rules.

  
  However, with restrict=on, the forwarded port is only accessible from the 
host. Other systems receive no data.

  This was tested with qemu 2.8. Changelog for 2.9 doesn't mention any
  (relevant) user networking changes, so that should also fail.

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