Skip to main content

linux - Bind 9.2 server refuses to resolve CNAME from sub-zone

itemprop="text">

I've got an old master nameserver
running Bind 9.2 and a newer slave running 9.8. Right now we've got a project going on
where we're essentially splitting a cloud in two and we're using subzones and CNAMEs to
keep our services running smoothly. However, the cranky old 9.2 server doesn't seem to
want to resolve the CNAMEs to the subzone and returns REFUSED: recursion
requested but not available. On the other hand the 9.8 server serves the
requests just
fine.



Disclaimer: I
know these nameservers are horribly out of date, and even worse the one running 9.2's OS
is waaaaay out of support as well, so I'm not likely to find a reputable package to
upgrade it. The project immediately after this cloud split is rebuilding our DNS
servers/services from scratch.




How
can I get the older server to resolve these CNAMEs
properly?



dig
results



dig @ NS1 [Bind
9.2]



# dig foo.domain.com
            @ns1.domain.com

; <<>> DiG
            9.8.2rc1-RedHat-9.8.2-0.30.rc1.el6_6.3 <<>> foo.domain.com
            @ns1.domain.com

;; global options: +cmd
;; Got
            answer:
;; ->>HEADER<<- opcode: QUERY, status: REFUSED, id:
            5937
;; flags: qr rd; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL:
            0
;; WARNING: recursion requested but not available

;;
            QUESTION SECTION:
;foo.domain.com. IN A

;; Query time:
            116 msec

;; SERVER: 4.3.2.1#53(4.3.2.1)
;; WHEN: Fri Jul
            31 16:18:36 2015
;; MSG SIZE rcvd:
            48


dig @ NS2 [Bind
9.8]



# dig foo.domain.com
            @ns2.domain.com

; <<>> DiG
            9.8.2rc1-RedHat-9.8.2-0.30.rc1.el6_6.3 <<>> foo.domain.com
            @ns2.domain.com

;; global options: +cmd
;; Got
            answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id:
            59986
;; flags: qr aa rd; QUERY: 1, ANSWER: 2, AUTHORITY: 2, ADDITIONAL:
            2
;; WARNING: recursion requested but not available

;;
            QUESTION SECTION:
;foo.domain.com. IN A

;; ANSWER
            SECTION:

foo.domain.com. 300 IN CNAME
            foo.sub.domain.com.
foo.sub.domain.com. 300 IN A
            5.6.7.8

;; AUTHORITY SECTION:
sub.domain.com. 300 IN NS
            ns1.domain.com.
sub.domain.com. 300 IN NS
            ns2.domain.com.

;; ADDITIONAL SECTION:
ns1.domain.com. 30
            IN A 4.3.2.1
ns2.domain.com. 30 IN A
            1.2.3.4


;; Query time: 80 msec
;; SERVER:
            1.2.3.4#53(1.2.3.4)
;; WHEN: Fri Jul 31 16:22:29 2015
;; MSG SIZE
            rcvd:
            161


Config



Below
are the config files for the servers, trimmed down to the bare
essentials.




NS1 [Bind
9.2]



options {

            recursion no;
 additional-from-auth no;
 additional-from-cache
            no;
 blackhole { bogon; };
 directory "/var/named";

            notify yes;

};
zone "domain.com" {
 type
            master;
 file "/var/named/domain.com.hosts";
 also-notify { 1.2.3.4;
            };
 notify yes;
};
zone "sub.domain.com" {
 type
            master;
 file "/var/named/sub.domain.com.hosts";


            also-notify { 1.2.3.4; };
 notify
            yes;
};


NS2
[Bind 9.8]



options {

            directory "/var/named";
 recursion no;

 blackhole{ bogon;
            };
 dnssec-enable yes;
 dnssec-validation yes;

            dnssec-lookaside auto;
};
zone "domain.com" {
 type
            slave;
 masters { 4.3.2.1; };
 allow-transfer { 4.3.2.1;
            };
 file
            "/var/named/slaves/domain.com.hosts";

};
zone
            "sub.domain.com" {
 type slave;
 masters { 4.3.2.1; };

            allow-transfer { 4.3.2.1; };
 file
            "/var/named/slaves/sub.domain.com.hosts";
};


domain.com.hosts




$ORIGIN
            .
$TTL 300 ; 5 minutes
domain.com IN SOA ns1.domain.com.
            servers.domain.com. ( ... )
 NS ns1.domain.com.
 NS
            ns2.domain.com.
$ORIGIN domain.com.
sub NS
            ns1.domain.com.
sub NS ns2.domain.com.
foo CNAME
            foo.sub



sub.domain.com.hosts



$ORIGIN
            .
$TTL 300 ; 5 minutes
sub.domain.com IN SOA ns1.domain.com.
            servers.domain.com. ( ... )
 NS ns1.domain.com.
 NS
            ns2.domain.com.
$ORIGIN sub.domain.com.

foo A
            5.6.7.8

class="post-text" itemprop="text">
class="normal">Answer



I tossed
this question at some smart dudes on IRC and got the
answer:



options {

            additional-from-auth yes;
 additional-from-cache
            yes;
}



Where
both were explicitly set to no in my
config.



href="http://www.zytrax.com/books/dns/ch7/queries.html#additional-from-auth"
rel="nofollow
noreferrer">http://www.zytrax.com/books/dns/ch7/queries.html#additional-from-auth





additional-from-auth and
additional-from-cache control the behaviour when zones have
additional (out-of-zone) data or when following CNAME or DNAME records. These options
are for used for configuring authoritative-only (non-caching) servers and are only
effective if recursion no is specified in a global options
clause or in a view clause. The default in both cases is yes. These statements may be
used in a global options or in a view clause. The behaviour is defined by the table
below:




And then
the table basically boils down to:





If
they're not both set to yes the type of query
referenced in this question is going to be refused more or less all the
time.



Comments

Post a Comment

Popular posts from this blog

linux - iDRAC6 Virtual Media native library cannot be loaded

When attempting to mount Virtual Media on a iDRAC6 IP KVM session I get the following error: I'm using Ubuntu 9.04 and: $ javaws -version Java(TM) Web Start 1.6.0_16 $ uname -a Linux aud22419-linux 2.6.28-15-generic #51-Ubuntu SMP Mon Aug 31 13:39:06 UTC 2009 x86_64 GNU/Linux $ firefox -version Mozilla Firefox 3.0.14, Copyright (c) 1998 - 2009 mozilla.org On Windows + IE it (unsurprisingly) works. I've just gotten off the phone with the Dell tech support and I was told it is known to work on Linux + Firefox, albeit Ubuntu is not supported (by Dell, that is). Has anyone out there managed to mount virtual media in the same scenario?
Post a Comment
Read more

ubuntu - Monitoring CPU, Mem, disk, on a single server

I've been looking for a simple starter solution for monitoring my [currently] single server hosted solution. Other than Nagios and similar, are there other good (simple) solutions people are using? Answer Everything depends on what you want. For example Munin is very simple, you can install and configure it in less then 10 minutes (on one server), it can sends alarms, make graphs from monitoring cpu, mem. apache connections, eaccellerator, disk io and many many more (it has many plugins). But if you are planning in future get some more machines, munin may not be enough. For example in munin you cant monitor state of individual processes, can't monitor changes in files (for security purpose). So if you wanna only see what is the utilization of basics parameters on your server and don't plan to buy some more servers Munin is what you are looking for, but if you wanna be alarmed when some of your service is down, take more control on what is happeninig on...
Post a Comment
Read more

hp proliant - Smart Array P822 with HBA Mode?

We get an HP DL360 G8 with an Smart Array P822 controller. On that controller will come a HP StorageWorks D2700 . Does anybody know, that it is possible to run the Smart Array P822 in HBA mode? I found only information about the P410i, who can run HBA. If this is not supported, what you think about the LSI 9207-8e controller? Will this fit good in that setup? The Hardware we get is used but all original from HP. The StorageWorks has 25 x 900 GB SAS 10K disks. Because the disks are not new I would like to use only 22 for raid6, and the rest for spare (I need to see if the disk count is optimal or not for zfs). It would be nice if I'm not stick to SAS in future. As OS I would like to install debian stretch with zfs 0.71 as file system and software raid. I have see that hp has an page for debian to. I would like to use hba mode because it is recommend, that zfs know at most as possible about the disk, and I'm independent from the raid controller. For us zfs have many benefits, ...
Post a Comment
Read more