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

[Stéphane Graber]

Hmm, I tried reproducing the issue here with Oneiric 64bit but don't
seem to get the same issue as you did.

I'm using your ubuntu-minimal.cfg hosted at
http://www.stgraber.org/download/ubuntu-minimal.cfg and booting the
current kernel and initrd from
http://archive.ubuntu.com/ubuntu/dists/oneiric/main/installer-
amd64/current/images/netboot/ubuntu-installer/amd64/ using pxelinux in a
VM using the etherboot boot rom.

I first see d-i starting up and doing basic network configuration, then
restarting once it's parsed the kickstart file, then doing dhcp
configuration again, succeeding and starting to download installer
components.

Can you confirm you still have that issue with what's currently on
http://archive.ubuntu.com/ubuntu/dists/oneiric/main/installer-
amd64/current/images/netboot/ubuntu-installer/amd64/ and if so, could
you share your dhcp configuration?

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https://bugs.launchpad.net/bugs/848072

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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