SERVFAIL error

Stephane Bortzmeyer bortzmeyer at nic.fr
Tue Aug 3 10:28:13 UTC 2004


On Tue, Aug 03, 2004 at 10:55:53AM +0430,
 S. Khademi <khademi at cc.iut.ac.ir> wrote 
 a message of 74 lines which said:

> But, when I use nslookup for my local host that I set those on my bind I 
> get this message:
> 
> 
> [root at ns2 root]# nslookup cc.iut.ac.ir
> Server:         217.219.18.22
> Address:        217.219.18.22#53
> 
> ** server can't find cc.iut.ac.ir: SERVFAIL

It seems OK now (with a better testing tool):

~ % dig A cc.iut.ac.ir

; <<>> DiG 9.2.4rc5 <<>> A cc.iut.ac.ir
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 17044
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 1, ADDITIONAL: 1

;; QUESTION SECTION:
;cc.iut.ac.ir.                  IN      A

;; ANSWER SECTION:
cc.iut.ac.ir.           86400   IN      A       217.219.18.2

;; AUTHORITY SECTION:
iut.ac.ir.              86384   IN      NS      ns.iut.ac.ir.

;; ADDITIONAL SECTION:
ns.iut.ac.ir.           86384   IN      A       217.219.18.20

;; Query time: 189 msec
;; SERVER: 192.134.4.134#53(192.134.4.134)
;; WHEN: Tue Aug  3 12:26:33 2004
;; MSG SIZE  rcvd: 79

But I strongly suggest that you delegate iut.ac.ir to at least two
nameservers. One is clearly not enough. What if there is a power
failure?

~ % zonecheck iut.ac.ir
ZONE  : iut.ac.ir.
NS <= : ns.iut.ac.ir. [217.219.18.20]

       _____________
     ,-------------.|
~~~~ |    fatal    || ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     `-------------'
f> At least two nameservers are necessary
 | Adv: ZoneCheck
 |   To avoid loosing all connectivity with the autoritative DNS in case
 | of network outage it is advised to host the DNS on different networks.
 | 
 | Ref: IETF RFC2182 (Abstract)
 |   The Domain Name System requires that multiple servers exist for every
 | delegated domain (zone). This document discusses the selection of
 | secondary servers for DNS zones. Both the physical and topological
 | location of each server are material considerations when selecting
 | secondary servers. The number of servers appropriate for a zone is also
 | discussed, and some general secondary server maintenance issues
 | considered.
 `----- -- -- - -  -
=> generic

==> FAILURE


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