** Description changed:

  I set up a bridge (linux bridge, also tried ovs bridge), with two taps.
  Two qemu vms, one using each tap, using virtio or e1000.  Ran one as
  dnsmasq+pxe server, the other '-boot n'.  Watching traffic on the bridge
  and each tap device, i could verify that boots replied to bootc
  requests, and the booting vm's tap did receive that reply.  But it would
  just keep re-issuing its bootc request.
  
  When I build ipxe from git and install the result, it works.
  
- This was happening with 19.04.  I'm going to upgrade, I assume it's
- fixed in 20.04 and probably 19.10, but will reply here.  But the bug
- should be open to save other people the hours I wasted trying to find a
- bug in the bridge code, until 19.04 is EOL.
+ This was happening with 19.10.  I'm going to upgrade, I assume it's
+ fixed in 20.04, but will reply here.

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https://bugs.launchpad.net/bugs/1886677

Title:
  bootp replies go missing

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