SUMMARY - DNS Q

From: Michael Cook (mcook@uswest.com)
Date: Fri Jun 05 1998 - 14:26:05 CDT


Hello all,

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    The original Q was:

    I'm setting up a DNS server on an Ultra Enterprise II, running 2.5.1,
with recommended & Y2K patches, 128mb RAM, 300 mHz processor. It will be the
primary DNS server for a web server hosting 3 domains on 3 separate ip #'s,
on another Ultra Enterprise II multi-homed host. I think I have it all
licked but for this one issue. My question is:

In the resolv.conf file:

                 Do I define all domains that this machine is authoritative
for? - they are all referred to in /etc/named.boot
                 Which nameservers?
                        My guess is:

                            dns% cat resolv.conf
                            domain abc.com
                            domain xyz.com
                            domain mno.net
                            nameserver [this machine's ip#]
                            nameserver [secondary dns server's ip #]
                            nameserver [tertiary dns server's ip #]

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

I got several answers which pointed me in the right direction (and a new
direction!!!) Many thanks to: Jochen Bern, Bismark Espinoza, Geoff Weller,
John Berninger, Leandro Guimaraens Faria Corcete Dutra, Blayne Puklich, Navi
Sirisena, & Dave Wreski.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

First I was pointed to a security problem in Solaris 2.5.1 in.named. It
seems that one can gain root access to a box running the out-of-the-package
version. This problem is detailed at:
http://www.cert.org/advisories/CA-98.05.bind_problems.html . I called Sun
tech support, and they pointed me to patch 103663-12 which fixes this
problem. Next the resolv.conf file: Only the domain in which the nameserver
lives is defined in the domain line. The other domains it serves are defined
with a search line. My final resolv.conf is:

                            dns% cat resolv.conf
                            domain abc.com
                            search abc.com xyz.com mno.net
                            nameserver [this machine's ip#]
                            nameserver [secondary dns server's ip #]
                            nameserver [tertiary dns server's ip #]

Again, my thanks to the above, the DNS works perfectly now,

    Michael Cook



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