[Bug 848072] Re: [oneiric] net-installer dhcp client fails with a DHCPDECLINE

[Stéphane Graber]

Just done running a few tests and didn't find any regression, though that was just with a standard:
 - Start the installer
 - Let netcfg run automatically
 - Download components
 - End of test

I only tried once to get back to netcfg from a later point and it seemed
to work fine too.

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Title:
  [oneiric] net-installer dhcp client fails with a DHCPDECLINE

Status in “netcfg” package in Ubuntu:
  Confirmed

Bug description:
  Installing recent oneiric builds via the net installer images fails.  The first dhcp request to fetch the pxe boot image succeeds, as does the second before fetching a kickstart file.  
  The third and final time, however, fails with the client rejecting the lease with a DHCPDECLINE, repeating this over and over again.

  I first started seeing this problem somewhere after the alpha-3
  installer image, though I'm not sure exactly where.  The
  20101020ubuntu63 installer build fails.

  Tracing through /sbin/dhclient-script it looks like the call in
  BOUND|RENEW|REBIND|REBOOT) where it calls 'ip -4 addr add [..]' was
  failing with a File Exists response.  The old and new settings
  appeared identical, however.

  I managed to work around this by adding an unconditional call to 'ip
  -4 addr flush dev $interface' in /sbin/dhclient-script right after the
  call to set_hostname.  With this workaround, all proceeds as expected,
  though I'm not sure what the underlying problem is.

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