Bind9 / Cox reverse lookup

[Rusty Ramser]

I'm not sure that's a valid assumption, regarding needing a DNS server even
with that functionality.  Maybe it is in your specific use, but it doesn't
strike me as a guaranteed necessity.

The learning aspect of it, however, is something I can't debate.  If that's
part of your goals, then by all means run wild with it.  :)

Cheers.


-----Original Message-----
From: plug-discuss-bounces at lists.phxlinux.org
[mailto:plug-discuss-bounces at lists.phxlinux.org] On Behalf Of Keith Smith
Sent: Tuesday, October 6, 2015 12:03
To: Main PLUG discussion list <plug-discuss at lists.phxlinux.org>
Subject: RE: Bind9 / Cox reverse lookup

I assume I need a DNS server since the box is a web server and will be
hosting a couple websites and there will be email as well.  And part of the
reason I am doing this is to learn.



-----Original Message-----
From: plug-discuss-bounces at lists.phxlinux.org
[mailto:plug-discuss-bounces at lists.phxlinux.org] On Behalf Of Rusty Ramser
Sent: Tuesday, October 6, 2015 11:53
To: 'Main PLUG discussion list' <plug-discuss at lists.phxlinux.org>
Subject: RE: Bind9 / Cox reverse lookup

>From the scenario you describe, no, I don't see that creating your own
reverse lookup zone would be necessary.

Your web server has no other internal systems in your environment to look
up.  And for external reverse lookups using the public information (from
Cox, Google, OpenDNS, or whatever your preference) should be fine.  I
wouldn't create something that would just require extra
management/maintenance when there's no real use case for it.

(Actually, for just a single box that is only accepting NATed web traffic,
I'm not even sure I understand the need for a forward lookup zone on your
server.  Is there some reason that its client DNS configuration can't just
point to your preferred DNS provider?  Do you really need a DNS server
functioning on the box?)

Cheers.


-----Original Message-----
From: plug-discuss-bounces at lists.phxlinux.org
[mailto:plug-discuss-bounces at lists.phxlinux.org] On Behalf Of Keith Smith
Sent: Tuesday, October 6, 2015 11:14
To: Main PLUG discussion list <plug-discuss at lists.phxlinux.org>
Subject: RE: Bind9 / Cox reverse lookup


Thanks Rusty.

It is one box.  It is on a non-routable IP.  I use NAT for ports 80, 443,
53... etc.

So are you saying I need to make a reverse lookup for the non-routable IP?

Thanks!!
Keith


-----Original Message-----
From: plug-discuss-bounces at lists.phxlinux.org
[mailto:plug-discuss-bounces at lists.phxlinux.org] On Behalf Of Rusty Ramser
Sent: Tuesday, October 6, 2015 11:05
To: 'Main PLUG discussion list' <plug-discuss at lists.phxlinux.org>
Subject: RE: Bind9 / Cox reverse lookup

Hi, Keith.

Will your environment be needing to do internal lookups based upon IP?  For
instance, are you using a non-routable set of IP addresses (e.g., 10.x.x.x,
192.168.x.x) for your environment behind NAT, and will those systems need to
perform name resolution of each other based upon IP?  If so, yes, you'll
want to have your own internal reverse lookup zone because obviously Cox (or
any other public DNS provider) will not have that information.

If you really don't need any internal reverse name resolution, then there
may be no need to create a zone.  For instance, there isn't an "environment"
of servers you have, it's just this single web server.  And the web server
doesn't have any internal network it sits on, it's just got a public,
routable IP address.

Cheers.


-----Original Message-----
From: plug-discuss-bounces at lists.phxlinux.org
[mailto:plug-discuss-bounces at lists.phxlinux.org] On Behalf Of Keith Smith
Sent: Tuesday, October 6, 2015 10:11
To: Main PLUG discussion list <plug-discuss at lists.phxlinux.org>
Subject: Bind9 / Cox reverse lookup


Hi,

I'm configuring Bind9 on my web server connected to Cox.  Cox configures the
IP reverse lookup.

Do I still need to create a reverse zone file?

The reverse zone file is to lookup the host by IP correct?

Thank you for your help!!

Keith
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