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

[Jason Sharp]

I'm still seeing a problem doing DNS look up even after this seems to be
'fixed'

If, when trying to download a kickstart config by DNS, it immediately
fails. I can see it go through the process of getting an IP, then it
attempts to get another IP again.  I know if i swap to a different tty
and run udhcp everything comes back to life, but by then its too late

Can you walk me through the steps to see if this is actually my issue or
if i've uncovered another bug some where?

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

Status in “netcfg” package in Ubuntu:
  Fix Released

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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