setting the DNS search string

David W. Hankins David_Hankins at isc.org
Thu Mar 5 17:48:14 UTC 2009


On Thu, Mar 05, 2009 at 08:56:32AM -0800, Doug Chapman wrote:
>   option domain-search domain-list;

This was added in 3.1.0.

> On Wed, Mar 4, 2009 at 7:37 AM, Peter Laws <plaws at ou.edu> wrote:
> > (This, FBoFW, is dhcp-3.0.5-18.el5 under RHEL 5.3.

Which does not support the domain-search option.

You can configure 'option domain-name "example.com sales.example.com";',
and on many Unixish systems, this will become a 'search' string in
/etc/resolv.conf.  But it doesn't work as expected on many non-unixish
systems (they parse the spaces as part of the domain name).

But you can still configure the domain-search option by hand.  The
easiest thing is to configure it without compression tags;.

  option domain-search code 119 = text;

  option domain-search "\003eng\007example\003com\000\007example\003com\000";

The \-escapes are octal numbers, counting the number of characters in
the following tag (eng = 3, example = 7, com = 3...).  A zero count
ends one domain name and moves on to the next.

> > Yes, I should be using
> > ISC DHCP 4.x, but it's a support thing - i.e. I'm not willing to support it
> > myself!  Why Redhat is *this* far behind, I have no idea.  I don't want
> > bleeding edge, but this is further behind than necessary.)

In their defense, 3.1, 4.0, and 4.1 all came out within a year of each
other, in a veritable feast of DHCPv6 related development.

-- 
David W. Hankins	"If you don't do it right the first time,
Software Engineer		     you'll just have to do it again."
Internet Systems Consortium, Inc.		-- Jack T. Hankins
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