[Bug 1104675] Re: Bad handling of multiple domainname options

[Axel Beckert]

Hi Chris,

on which Ubuntu release or with which version of isc-dhcp-client did you
experience this issue?

There was a multiple domains related bug (http://bugs.debian.org/567141)
which has been fixed in Ubuntu Oneiric and Debian Wheezy (i.e. Ubuntu
Lucid and Debian Squeeze are still affected). I don't think it's
directly related to that bug, but after this had been fixed, I was IIRC
able to use multiple domains via DHCP.

** Bug watch added: Debian Bug tracker #567141
   http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=567141

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https://bugs.launchpad.net/bugs/1104675

Title:
  Bad handling of multiple domainname options

Status in “isc-dhcp” package in Ubuntu:
  New

Bug description:
  As far as I know, the dhcp standards do not allow for multiple
  Domainnames to be set through Option 15. My LInksys router doesn't
  care, though, and sends both the Domainname I gave it AND the
  Domainname my ISP gives it. Maybe this is non-standard, but it is what
  it is.

  isc-dhcp-client handles this in the worst possible way. It could
  choose one name or the other, or it could ignore both names when it
  sees the malfunction. Instead, it concatenates the names together,
  assuring that it ends up with an invalid name.

  From the below excerpt of dhcpdump I would end up with the domain name
  my.comhr.remote.com.

  OPTION:   6 (  4) DNS server                192.168.0.1
  OPTION:  15 ( 6) Domainname                my.com
  OPTION:  15 ( 13) Domainname                hr.remote.com
  ---------------------------------------------------------------------------

  In the end this gives me an invalid domain in search in resolv.conf.
  Ideally I'd end up with "search my.com hr.remote.com" there, but from
  scanning the scripts I can see how that wouldn't really work. Still,
  the concated domainname seems like a bad idea.

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