[Bug 1843857] Re: IPMasquerade=yes -> ignored on eoan

[Dan Streetman]

iptables was reverted back to using iptables-legacy by default in bug
1843468 so this should not be an issue (by default) in Eoan, though it
might be in the future when iptables does default to iptables-nft.

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Title:
  IPMasquerade=yes -> ignored on eoan

Status in systemd package in Ubuntu:
  New

Bug description:
  I'm testing out eoan, I have a [Network] section with IPMasquerade=yes.
  The system starts without complaint from systemd in the logs, but I see no evidence of source natting going on.
  I'm not sure of sub-dependencies, but I think source natting depends on libiptc-dev, which I don't see among the listings in eoan.

  I found Systemd-networkd updates 'iptables-legacy' with the source natting/masquerade detail -- which is disused by default.
    
  So it has no effect and doesn't throw an error.

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