It would help if you explained the situation a bit further.
Are you running a nameserver for some zone on one or more of these
Linux machines?
Are the other machines, Linux, Solaris, Other-Unix, Windoze, ...?
Are you running NIS in your environment so and distributing hosts files as
well as DNS records?
When I first encountered this problem it was in a mixed NIS/DNS environment
where the NIS master hosts file was the primary source of host name vs.
IP info. To get around the immediate problem when installing a new BIND to
replace ancient versions, I wrote a trivial script to modify the hosts
file, preceding any name containing underscores with the same name, but
with the underscores changed to hyphens.
---
132.223.240.99 blue-stalactite blue_stalactite # system in Carlsbad Caverns
---
NIS understands both names, so any NIS clients were happy. I use h2n to
generate the zone file for that zone from the hosts file. It puts in
the hyphened name as an A-record and the underscored name as a CNAME.
BIND has no problem with CNAMEs containing underscores, so everthing worked
fine. You can call it a kludge, but it gave us time to get rid of
references to the underscored names and eliminate them from the hosts file
and hence from the zone files.
pete peterson
> Date: Wed, 11 Apr 2001 16:34:21 -0400 (EDT)
> From: David Brett <[EMAIL PROTECTED]>
> To: Vidiot <[EMAIL PROTECTED]>
> Cc: [EMAIL PROTECTED]
> Subject: Re: DNS names with "_"
> Reply-To: [EMAIL PROTECTED]
>
> I realize the question was worded poorly. Is it possible to have named
> look at the host file first and use your idea of an alias for the bad
> hostname?
>
> If not the host file on all computers may work. I may be able to script
> this. I will not be publishing these bad hostnames to the public network
> just internal. So any way which will have named give the correct response
> is acceptable in this case.
>
>
> david
>
> On Wed, 11 Apr 2001, Vidiot wrote:
>
> > david posted:
> >
> > >Does anybody know of a way to allow DNS names with "_" in them? I have a
> > >number of servers with an underscore in them. It is going to take a lot
> > >of work to make the change by a large number people.
> >
> > Check RFC-1034 and RFC-1035 for details, but I believe it is illegal to
> > have underscores in a hostname. BTW, it is hostname, not DNS names.
> > This means you have to change all of your hostnames to legal names
> > if you want named to work.
> >
> > But, you can do the following to each machine:
> >
> > /etc/hosts:
> >
> > 123.456.789.012 bad_hostname bad-hostname
> >
> > By adding an alias to the hosts file, you can now have the named entries
> > point to the good bad-hostname. It still means editing all of the hosts
> > files on all of the machines. Without doing doing that, you will not be able
> > DNS any of the machines. By adding the alias, anything that you have that
> > references the bad name will still work. BUT, if you rely upon named to
> > resolve it for you... nope, ain't gonna happen.
> >
> > The above information is my understanding of the situation.
>
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