[CentOS] Caching nameserver -- Name Services Cache Daemon (nscd)

William Warren hescominsoon at emmanuelcomputerconsulting.com
Wed Aug 10 12:25:44 UTC 2005


dig to localhost says:
[root at enoch ~]# dig localhost

; <<>> DiG 9.2.4 <<>> localhost
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 2833
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 1, ADDITIONAL: 1

;; QUESTION SECTION:
;localhost.                     IN      A

;; ANSWER SECTION:
localhost.              86400   IN      A       127.0.0.1

;; AUTHORITY SECTION:
localhost.              86400   IN      NS      localhost.

;; ADDITIONAL SECTION:
localhost.              86400   IN      A       127.0.0.1

;; Query time: 6 msec
;; SERVER: 192.168.0.1#53(192.168.0.1)
;; WHEN: Wed Aug 10 08:24:15 2005
;; MSG SIZE  rcvd: 73


nslookup still says:

[root at enoch ~]# dig localhost

; <<>> DiG 9.2.4 <<>> localhost
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 2833
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 1, ADDITIONAL: 1

;; QUESTION SECTION:
;localhost.                     IN      A

;; ANSWER SECTION:
localhost.              86400   IN      A       127.0.0.1

;; AUTHORITY SECTION:
localhost.              86400   IN      NS      localhost.

;; ADDITIONAL SECTION:
localhost.              86400   IN      A       127.0.0.1

;; Query time: 6 msec
;; SERVER: 192.168.0.1#53(192.168.0.1)
;; WHEN: Wed Aug 10 08:24:15 2005
;; MSG SIZE  rcvd: 73


It's starting to look like maybe a OS reinstall?

Johnny Hughes wrote:
> On Wed, 2005-08-10 at 00:27 -0500, Les Mikesell wrote:
> 
>>On Tue, 2005-08-09 at 17:22, William Warren wrote:
>>
>>
>>>So i did this:
>>> >nslookup hotmail.com
>>>(on my winders box)
>>>and i got this:
>>>*** Can't find server name for address 192.168.0.200: Non-existent domain
>>
>>I think this is only fatal with nslookup, but DNS servers should be
>>able to reverse-resolve their own IP address to a name and apparently
>>your forwarding server doesn't know your private addresses either.
>>What does 'dig @localhost' say on the box itself?
>>
>>The right fix is to configure either this or the upstream server
>>as primary for the 192.168.0 zone.  Otherwise you'll toss thousands
>>of these queries up to the root servers.
>>
>>zone "0.168.192.in-addr.arpa" IN {
>>       type master;
>>       file "192.168.0.arpa";
>>       allow-update { none; };
>>};
>>If you don't know the format for the zone file mentioned, you
>>might want to use webmin to build it.
>>
>>
>>
>>>The box's name is Enoch.emmanuelcomputerconsulting.com
>>>ip is 192.168.0.200 set statically.
>>
>>Does your upstream server resolve that domain or your private
>>addresses?
>>
> 
> BTW, there is a package called caching-nameserver ... 
> 
> yum install caching-namesever
> 
> will give you a good working caching nameserver
> 
> 
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