** Changed in: iptables (Ubuntu)
     Assignee: (unassigned) => Julian Andres Klode (juliank)

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https://bugs.launchpad.net/bugs/1843468

Title:
  nftables based iptables wrapper break userspace

Status in iptables package in Ubuntu:
  Triaged

Bug description:
  iptables just got replaced by the nftables wrappers, effectively
  changing all Ubuntu systems to using nftables rather than regular
  iptables/ip6tables/ebtables.

  Unfortunately those wrappers aren't perfect and don't convert every
  option properly, nor know about some of the available plugins for
  those commands.

  This means that unless the software using those commands are aware
  that those are wrappers and adapt their use, they may break at some
  random point in time.

  
  While nftables is clearly the way forward, just silently switching the 
existing native tools with the compat wrappers will lead to widespread breakage 
both from packages in the archive, snaps and a variety of scripts our users may 
be running.

  So far, looking around, known breakages post-nft are expected with at
  least Docker, Kubernetes and LXD but the same may be true with the
  many other packages we have that call iptables, ip6tables, ebtables or
  arptables today.

  A migration should include a proper audit of all in-archive users, see
  if they have a plan/patch for native nft interaction and if not,
  validate their use of the tools is compatible with the wrappers.

  We should also extend that to popular snaps / those we ship by
  default. Snaps make things worse as they use the tools from their base
  snap, which in LXD's case is currently 16.04 (soon to switch to
  18.04).

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