[Bug 758655] Re: PXE install does not get a DHCP address

[Stéphane Graber]

Marking as fix released. I just ran a mini.iso install on Precise and
checked the dhcp queries with wireshark, no option 57 is being passed
anymore, so there shouldn't be any limit being imposed on the server.

** Changed in: isc-dhcp (Ubuntu)
       Status: New => Fix Released

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Title:
  PXE install does not get  a DHCP address

Status in “isc-dhcp” package in Ubuntu:
  Fix Released

Bug description:
  I just tried to install Natty Narwhal (Ubuntu 11.04) using PXE, and
  experienced that it did not get an IP address. The PXE phase is
  running OK, but as soon as the Natty Narwhal installer tries to get a
  DHCP address things go wrong. I started a Wireshark trace, and
  investigated the problem.

  It appears that the dhcp client is asking for a maximum of 576 bytes
  (option 57, Maximum DHCP message size). This will prevent my DHCP
  server (a DD-WRT router/access point) from answering. During the PXE
  boot phase a maximum size of 1260 bytes is requested. My DHCP server
  will send an DHCP offer for such a request. It will also send a reply
  when no max size is given in the request.

  So the conclusion is that the installer should either allow for more
  data to be sent in the DHCP reply, or should not restrict the message
  length at all, in order to get a reply from my DD-WRT DHCP server.

  I just checked with the Maverick Meerkat (Ubuntu 10.10) network
  installer: this installer works OK, as it is not restricting the
  maximum size of the reply at all. I did not investigate the source of
  the bug (this could possibly be a bug in DD-WRT v24-sp2 (03/17/11)
  mega - build 16454).

  I would propose that Natty Narwhal is modified in such a way, that
  (like in Maverick Meerkat) no restrictions are applied to the maximum
  size of the reply, in order to make it compatible to a broader range
  of DHCP servers.

  ProblemType: Bug
  DistroRelease: Ubuntu 11.04
  Package: isc-dhcp-client 4.1.1-P1-15ubuntu8
  ProcVersionSignature: Ubuntu 2.6.38-8.42-generic 2.6.38.2
  Uname: Linux 2.6.38-8-generic i686
  Architecture: i386
  Date: Tue Apr 12 12:48:02 2011
  ProcEnviron:
   LANGUAGE=nl_NL:en
   PATH=(custom, no user)
   LANG=nl_NL.UTF-8
   SHELL=/bin/bash
  SourcePackage: isc-dhcp
  UpgradeStatus: No upgrade log present (probably fresh install)

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