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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