Question

How to configure a local caching nameserver (bind) to serve forward and reverse private LAN name resolutions?

Asked by: ChrisDrake

Hi guys - what do I put into /etc/named.conf so that this...

dig -x 192.168.0.123

works, and also,

dig 192-168-0-123.mylan.com

works

preferably also this working too:-

dig 192-168-0-123.mylan.com mx

I want it to resolve all 256 IP addresses from 192.168.0.0 through 192.168.0.255

Thanks for your help!!!

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Asked On
2005-10-26 at 03:28:26ID21608088
Tags

bind

,

caching

Topic

Linux Networking

Participating Experts
3
Points
51
Comments
10

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Answers

 

by: harbor235Posted on 2005-10-26 at 04:54:17ID: 15161536

 

by: harbor235Posted on 2005-10-26 at 04:55:16ID: 15161541

 

by: ChrisDrakePosted on 2005-10-26 at 07:34:03ID: 15162892

None of that make any sense.  I don't want to set up a world-domination name serving organization - I just want all my LAN DNS resolutions to *work*.

C'mon - it's about 8 lines of "bind" guff I'm guessing - does anyone know the answer?

 

by: ChrisDrakePosted on 2005-10-26 at 09:08:52ID: 15163860

Here's part of what I think I need - but note the '-*' does not work

1       PTR     172-22-0-1.mylan.com.
*       PTR     172-22-0-*.mylan.com.
7       PTR     172-22-0-77.mylan.com.

# dig @127.0.0.1 -x 172.22.0.2

;; ANSWER SECTION:
2.0.22.172.in-addr.arpa. 86400  IN      PTR     172-22-0-*.mylan.com.
---------------------------------------------------.................^
How do I fix this........................................^

 

by: kamermansPosted on 2005-10-28 at 14:13:24ID: 15182743

[root@4th perl]# echo x       PTR     172-22-0-x.mylan.com. | perl -e '$a=<>;foreach(1..254){$b=$a;$b=~s/x/$_/g;print$b;}' > temp.dns

[root@4th perl]# cat temp.dns
1 PTR 172-22-0-1.mylan.com.
2 PTR 172-22-0-2.mylan.com.

...

253 PTR 172-22-0-253.mylan.com.
254 PTR 172-22-0-254.mylan.com.

 

by: ChrisDrakePosted on 2005-10-28 at 17:58:04ID: 15183690

Yeah - I know I could shove 256 entries in my HOSTS file and be done with it - but I'm trying to set up "bind" properly instead.

I doubt individual entries is the correct solution - especially since I already guessed that "*" works at the front of the line - surely there's a way to insert the "*" matched value as a variable in what gets returned; from just one config line?

 

by: kamermansPosted on 2005-10-29 at 00:52:36ID: 15184413

Quote from http://www.ripe.net/ripe/maillists/archives/dns-wg/2004/msg00332.html :

"Wildcards" nowadays will produce sort of allergic reaction all over the place.
While you can of course apply them to PTR RRs in IN-ADDR.ARPA zones, they're
likely to break consistency. In addition, in a namespace as structured as
IN-ADDR.ARPA what's the advantage of '*' over some lines of perl script
(or BIND's $GENERATE) and "doing it right"?

BIND itself has a function to generate these entries - "$GENERATE".
You should read this howto on BINDs $GENERATE function, I think it's more like what you're looking for:
http://www.tech-recipes.com/bind_and_dns_tips312.html

 

by: Cyclops3590Posted on 2006-04-08 at 16:48:59ID: 16409555

No comment has been added to this question in more than 21 days, so it is now classified as abandoned.
I will leave the following recommendation for this question in the Cleanup topic area:
Split: harbor235 & kamermans

Any objections should be posted here in the next 4 days. After that time, the question will be closed.

Cyclops3590
EE Cleanup Volunteer

20120131-EE-VQP-002

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