Date: Fri, 15 Dec 2006 13:41:28 +0545 From: Tek Bahadur Limbu <teklimbu@wlink.com.np> To: "Chad Gross" <avatar4d@gmail.com> Cc: freebsd-questions@freebsd.org, ccowart@rescomp.berkeley.edu Subject: Re: Local DNS Caching not caching on external interface Message-ID: <20061215134128.d3b94153.teklimbu@wlink.com.np> In-Reply-To: <17489c7a0612140534l475bc427l28292e5de8adb098@mail.gmail.com> References: <20061214145735.658f44b4.teklimbu@wlink.com.np> <20061214090811.GE18145@rescomp.berkeley.edu> <20061214175501.04c4bcb2.teklimbu@wlink.com.np> <17489c7a0612140534l475bc427l28292e5de8adb098@mail.gmail.com>
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On Thu, 14 Dec 2006 08:34:11 -0500
"Chad Gross" <avatar4d@gmail.com> wrote:
> On 12/14/06, Tek Bahadur Limbu <teklimbu@wlink.com.np> wrote:
> >
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> > On Thu, 14 Dec 2006 01:08:11 -0800
> > Christopher Cowart <ccowart@rescomp.berkeley.edu> wrote:
> >
> > > On 14:57 Thu 14 Dec , Tek Bahadur Limbu wrote:
> > > > Dear All,
> > > >
> > > > I am very new to Bind and FreeBSD.
> > > >
> > > > I have just configured a Local DNS server using the built-in
> > > > Bind 9.3.1 on a FreeBSD 5.4 machine.
> > > >
> > > > My problem is that the machine can cache queries on the
> > > > localhost and loop back (127.0.0.1) interface only.
> > > >
> > > > I have a public static IP on this machine too and I can't seem
> > > > to query the caching name server from my local network.
> > > >
> > > > In Linux, this is no problem. I just can't seem to get Bind to
> > > > work as in my local network. It works only on the loopback
> > > > interface.
> > >
> > > The default /etc/namedb/named.conf configuration file for BIND
> > > says:
> > >
> > > | // If named is being used only as a local resolver, this is a
> > > | safe default. // For named to be accessible to the network,
> > > | comment this option, specify // the proper IP address, or
> > > | delete this option. listen-on { 127.0.0.1; };
> > >
> > > It looks like if you comment out that option, it will listen on *
> > > by default. You could also add the other IP address on which you
> > > want named to listen.
> > >
> > > --
> > > Chris Cowart
> > > Network and Infrastructure Systems Administrator
> > > RSSP-IT, UC Berkeley
> > > "May all your pushes be popped"
> > >
> >
> > Dear Chris,
> >
> > Thank you for your help. I did comment and added my public static IP
> > like the following:
> >
> >
> > listen-on { 202.x.x.x; }; # My Static IP
> >
> > Now when I do from my local PC:
> >
> > dig yahoo.com @202.x.x.x , I can do DNS lookups.
> >
> > But when I try doing that from another computer on my network, I
> > can't do any DNS lookups.
> >
> >
> > Is that anything that I miss?
> >
> >
> > - --
> >
> >
> > With best regards and good wishes,
> >
> > Yours sincerely,
> >
> > Tek Bahadur Limbu
> >
> > (TAG/TDG Group)
> > Jwl Systems Department
> >
> > Worldlink Communications Pvt. Ltd.
> >
> > Jawalakhel, Nepal
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> > _______________________________________________
>
>
>
> You have to tell the other machines on your network to use the IP of
> the local DNS server for domain name resolution. If you are using
> DHCP you can configure your DHCP server to give this information with
> the IP. Otherwise you must manually do it, which will be different
> between operating systems.
>
> HINT: In FreeBSD add the IP of the DNS server to /etc/resolve.conf
>
> Chad
>
Dear Chad,
I just get the following logs while troubleshooting with tcpdump.
local nameserver IP: 202.102.5.100
network PC IP: 202.102.5.50
When I do a nslookup of yahoo and google from network PC using the
local caching nameserver, I only get this on the caching nameserver.
13:23:58.707604 IP 202.102.5.50.44778 > 202.102.5.100.53: 56955+ A?
google.com. (28)
13:23:32.899379 IP 202.102.5.50.40229 > 202.102.5.100.53: 47636+ A?
yahoo.com. (27)
Note: Please note that the above Static IPs are just arbitrary values.
Can you please shed some light on this issue?
- --
With best regards and good wishes,
Yours sincerely,
Tek Bahadur Limbu
(TAG/TDG Group)
Jwl Systems Department
Worldlink Communications Pvt. Ltd.
Jawalakhel, Nepal
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