topic Simple DNS server (using Native HP-UX BIND) in Operating System - HP-UX

Simple DNS server (using Native HP-UX BIND)

Richard Briggs — Tue, 26 Sep 2006 13:05:55 GMT

I just want my HPUX server to serve up DNS info from my /etc/hosts file. I am on an isolated network.. and I don't want to update a bunch of /etc/hosts files around the network or share them out with NFS. I also have some routers on the network that I would like for this server to serve up DNS info to... is there just a simple way to use my hpux machine as a simple DNS primary server? The technical docs are confusing the heck outta me...

Re: Simple DNS server (using Native HP-UX BIND)

Steven E. Protter — Tue, 26 Sep 2006 13:09:49 GMT

Shalom,

DNS does not use /etc/hosts It uses zone records in /var/named or /var/named/chroot/var/named

HP has in the past provided a utility called hosts_to_named or similar name that converts an /etc/hosts file to DNS named zone records.

Here is a general how-to, aimed at Linux that I used to learn this years ago.

http://tldp.org/HOWTO/DNS-HOWTO.html

SEP

Re: Simple DNS server (using Native HP-UX BIND)

Geoff Wild — Tue, 26 Sep 2006 13:11:08 GMT

Did you read this doc?

http://docs.hp.com/en/B2355-90775/index.html

Chapter 1 has a nice overview, and Chapter 2 tells you step by step how to configure Bind.

Rgds...Geoff

Re: Simple DNS server (using Native HP-UX BIND)

V.Manoharan — Tue, 26 Sep 2006 13:13:00 GMT

Hi
refer the link below.
http://docs.hp.com/en/B2355-90775/ch01s01.html
regards
Mano

Re: Simple DNS server (using Native HP-UX BIND)

Richard Briggs — Tue, 26 Sep 2006 14:36:39 GMT

Geoff...yes I did read that (both)...but the service doesn't work (nslookup -> server host.... lookup failed, server error)

I have 4 IP ranges... 10.1-255.*.* and 192.x.x.x and 172.2-25 and one other. So the hosts_to_named -d network -n number is confusing me and I don't know why the server won't serve addresses up using nslookup

Re: Simple DNS server (using Native HP-UX BIND)

Geoff Wild — Tue, 26 Sep 2006 14:49:33 GMT

Okay - let us try some troubleshooting.

Is named running?

ps -ef |grep named

If no, then check:

/var/adm/named/named.log

Can you post your /etc/named.conf file?

Also, is NAMED=1 in /etc/rc.config.d/namesvrs ?

Rgds...Geoff

Re: Simple DNS server (using Native HP-UX BIND)

Richard Briggs — Tue, 26 Sep 2006 15:01:10 GMT

Geoff, named is running. I don't have the /etc/rc.config.d/ switch input yet (read at boot time)

this is the error that I'm getting....

==================================
> server dnsserver
Specifying a server has overridden the switch policy order.
The reset command will reinstate the order specified by the switch policy.
Default Name Server: dnsserver.domain.com
Address: 10.11.11.11

> nslookup host1
*** Can't find address for server dnsserver: Server failed
> nslookup host1
Name Server: server.domain.com
Address: 10.11.11.11

*** dnsserver can't find nslookup: Server failed
==================================

this is the conf file:
-------------------------------------------

// generated by named-bootconf.pl

options {
check-names response fail; // do not change this
check-names slave warn;
directory "/etc/named.data"; // running directory for named
/*
* If there is a firewall between you and nameservers you want
* to talk to, you might need to uncomment the query-source
* directive below. Previous versions of BIND always asked
* questions using port 53, but BIND 8.1 uses an unprivileged
* port by default.
*/
// query-source address * port 53;
};

//
// type domain source file
//
zone "0.0.127.IN-ADDR.ARPA" {
type master;
file "db.127.0.0";
};

zone "dom.domain.com" {
type master;
file "db.dom";
};

zone "." {
type hint;
file "db.cache";
};

zone "10.IN-ADDR.ARPA" {
type master;
file "db.10";
};

zone "192.IN-ADDR.ARPA" {
type master;
file "db.192";
};

zone "172.IN-ADDR.ARPA" {
type master;
file "db.172";
};

--------------------------------------------

Re: Simple DNS server (using Native HP-UX BIND)

Geoff Wild — Wed, 27 Sep 2006 07:26:54 GMT

> nslookup host1
*** Can't find address for server dnsserver: Server failed
> nslookup host1
Name Server: server.domain.com
Address: 10.11.11.11

*** dnsserver can't find nslookup: Server failed

Okay - that is kind of strange...

Are you running nslookup on the HPUX dnsserver or from another box?

If on the HPUX server (or any other for that matter) - what is in /etc/resolv.conf and what is the hosts line in /etc/nsswitch.conf?

Try uncommenting the // query-source address * port 53;

just remove the // and restart named.

Rgds...Geoff

Re: Simple DNS server (using Native HP-UX BIND)

KapilRaj — Wed, 27 Sep 2006 08:28:14 GMT

Do you really need a DNS ? Why not NIS with a hostname map ?

Regards,

Kaps

Re: Simple DNS server (using Native HP-UX BIND)

Richard Briggs — Wed, 27 Sep 2006 08:37:30 GMT

Kaps, Yes. I have routers & switches as well as hpux servers. We normally use QIP (lucent's DNS), but that project is delayed, so I need a temporary DNS server with no bells, no whistles, just heart pumping DNS at cardio pace. ;-)

Re: Simple DNS server (using Native HP-UX BIND)

Richard Briggs — Wed, 27 Sep 2006 08:55:43 GMT

Geoff... no dice. Did all that and same error. Thanks for trying though. I guess I'll open a ticket with HP and see what I'm doing wrong. I'll post a solution back here later

Re: Simple DNS server (using Native HP-UX BIND)

Richard Briggs — Wed, 27 Sep 2006 09:40:40 GMT

Interesting caveat I just noticed:

Reverse look ups work... regular look ups fail:
++++++++++++++++++++++++++++++++++++++++++++
nslookup

> 10.11.12.14
Using /etc/hosts on: dns01

looking up FILES (not found)
Trying DNS
Name: host01.domain.com
Address: 10.11.12.14

> host01
Using /etc/hosts on: dns01

looking up FILES (not found)
Trying DNS
*** localhost can't find host01: Server failed
+++++++++++++++++++++++++++++++++++++++++++++

Re: Simple DNS server (using Native HP-UX BIND)

Geoff Wild — Wed, 27 Sep 2006 10:25:06 GMT

try dig instead:

dig @hpuxserver host1.yourdomain.com

Check the zone file - is there an A record for host1?

Check the /var/adm/named/named.log file for errors related to that zone - maybe it didn't get loaded...

Rgds...Geoff

Re: Simple DNS server (using Native HP-UX BIND)

Richard Briggs — Wed, 27 Sep 2006 10:39:58 GMT

Geoff:

1.) I don't have "dig", I guess it's not native to HP-UX 11.11?

2.) there is a record in the db.10 file:
11.12.14 IN PTR host01.domain.com.

3.) I don't have a dir /var/adm/named or a named.log file? How do I enable logging?

thanks!

Re: Simple DNS server (using Native HP-UX BIND)

Richard Briggs — Wed, 27 Sep 2006 10:55:47 GMT

looks like logs go to syslog.log:

This is what I see when I start named:
Sep 27 09:50:28 dns01 named[15228]: master zone "10.IN-ADDR.ARPA" (IN) rejecte
d due to errors (serial 1)
Sep 27 09:50:28 dns01 named[15228]: master zone "192.IN-ADDR.ARPA" (IN) reject
ed due to errors (serial 1)
Sep 27 09:50:28 dns01 named[15228]: master zone "172.IN-ADDR.ARPA" (IN) reject
ed due to errors (serial 1)
Sep 27 09:50:28 dns01 named[15228]: listening on [10.11.12.14].53 (lan2)
Sep 27 09:50:28 dns01 named[15228]: listening on [127.0.0.1].53 (lo0)
Sep 27 09:50:28 dns01 named[15228]: Forwarding source address is [0.0.0.0].600
00
Sep 27 09:50:28 dns01 named[15229]: Ready to answer queries.

somebody put some underscores in some hostnames in /etc/hosts.

Re: Simple DNS server (using Native HP-UX BIND)

Steven E. Protter — Wed, 27 Sep 2006 11:01:21 GMT

Shalom,

Looks like the format of your zone records does not work. It also appears your system may need another zone record or two, the standards taht come with named.conf

named-checkzone is a linux utility used to check zone records.

If BIND for HP-UX does not provide this utility transfer your zone record to a linux machine with bind-utils installed and check them there.

SEP

Re: Simple DNS server (using Native HP-UX BIND)

Richard Briggs — Wed, 27 Sep 2006 11:36:21 GMT

OK.. I fixed all the errors in /etc/hosts and all the master zones loaded

what does this error mean?
=============================================
Sep 27 10:29:28 dns01 named[16364]: sysquery: findns error (NXDOMAIN) on dns01.domain.com?
=============================================

Re: Simple DNS server (using Native HP-UX BIND)

Geoff Wild — Wed, 27 Sep 2006 12:19:37 GMT

Is there a record for host1 in db.dom file?

If not, then that's your answer.

No dig?

Ah - you have an older version of bind...

Could always upgrade:

http://h20293.www2.hp.com/portal/swdepot/displayProductInfo.do?productNumber=BIND9.2

what does this error mean?
=============================================
Sep 27 10:29:28 dns01 named[16364]: sysquery: findns error (NXDOMAIN) on dns01.domain.com?

It means that dns01.domain.com is the target of an NS record, but there's no A record for that name.

Check the db.dom file!

Rgds...Geoff

Re: Simple DNS server (using Native HP-UX BIND)

Richard Briggs — Wed, 27 Sep 2006 13:06:55 GMT

Thanks Geoff, I was able to pinpoint the flaw - (hosts_to_named must be run only once for all the networks... not sequentially {i.e. hosts_to_named -d domain.com -n 10
hosts_to_named -d domain.com -n 192
hosts_to_named -d domain.com -n 172} which is what I was doing... meaning only the 172 data was being loaded. The fix was to run it one time like so:
hosts_to_named -d domain.com -n 10 -n 192 -n 172 -r

couldn't have got there without your help... points for you! Thanks!

Re: Simple DNS server (using Native HP-UX BIND)

Richard Briggs — Wed, 27 Sep 2006 13:59:03 GMT

answered