Date: Sun, 17 Dec 2006 17:56:30 +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: <20061217175630.1049dc31.teklimbu@wlink.com.np> In-Reply-To: <17489c7a0612150525v28657c0aib64d14a9b9daf30d@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> <20061215134128.d3b94153.teklimbu@wlink.com.np> <17489c7a0612150525v28657c0aib64d14a9b9daf30d@mail.gmail.com>
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On Fri, 15 Dec 2006 08:25:41 -0500
"Chad Gross" <avatar4d@gmail.com> wrote:
> On 12/15/06, Tek Bahadur Limbu <teklimbu@wlink.com.np> wrote:
> >
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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:
> > > >
> > > > -----BEGIN PGP SIGNED MESSAGE-----
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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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>
> Tek,
>
> Can you please post your Bind configuration files?
>
> Have you done a tcpdump or wireshark capture on both machines while
> issuing the resolution request? Could you please do that as well and
> post the results?
>
> Chad
> _______________________________________________
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> http://lists.freebsd.org/mailman/listinfo/freebsd-questions
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>
Hi Chad,
I have pasted my named.conf file below:
options {
directory "/etc/namedb";
pid-file "/var/run/named/pid";
dump-file "/var/dump/named_dump.db";
statistics-file "/var/stats/named.stats";
// 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 { localhost; };
listen-on {My.Public.IP;};
// If you have IPv6 enabled on this system, uncomment this option for
// use as a local resolver. To give access to the network, specify
// an IPv6 address, or the keyword "any".
// listen-on-v6 { ::1; };
// In addition to the "forwarders" clause, you can force your name
// server to never initiate queries of its own, but always ask its
// forwarders only, by enabling the following line:
//
// forward only;
// If you've got a DNS server around at your upstream provider, enter
// its IP address here, and enable the line below. This will make you
// benefit from its cache, thus reduce overall DNS traffic in the
Internet.
forwarders {
202.x.x.x;
202.x.x.x;
};
/*
* 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 versions 8 and later
* use a pseudo-random unprivileged UDP port by default.
*/
# query-source address * port 53;
};
key "dnsbind" {
algorithm hmac-md5;
secret "da3ss+cKp1po9Uadka0Onadf04Jils+kc=";
};
controls {
inet 127.0.0.1 port 953
allow { 127.0.0.1; } keys { "dnsbind"; };
};
// If you enable a local name server, don't forget to enter 127.0.0.1
// first in your /etc/resolv.conf so this server will be queried.
// Also, make sure to enable it in /etc/rc.conf.
zone "." {
type hint;
file "named.root";
};
zone "0.0.127.IN-ADDR.ARPA" {
type master;
file "master/localhost.rev";
};
// RFC 3152
zone
"1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.IP6.ARPA" { type
master; file "master/localhost-v6.rev";
};
Do I need to edit and create other config files besides rndc.conf?
Please shed some light on this
Thanks.
- --
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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