Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.os.linux.networking > #1487

Re: "Timeout" DNS IP to name resolution

Show all headers | View raw

Hello,

buck a écrit :
> Chris Davies <chris-usenet@roaima.co.uk> wrote :
> 
>> buck <buck@private.mil> wrote:
>>> 1) What is the difference between immediate return of blank/empty 
>>> set and timeout?
>>  
>> The first is a definitive "there is no information available". But 
>> you can't (shouldn't) draw any definitive conclusions from the second.
>> Maybe the network was a little slow today. Maybe your UDP packets or
>> the answers got dropped somewhere en route. Maybe the far end's rDNS
>> really is misconfigured.
> 
> You say "misconfigured".  Does that mean that rDNS is SUPPOSED to be 
> set up?  If so, are you able to cite a reference. 

Any DNS query should get a reply, either positive or negative, from an
authoritative DNS server.

> FWIW and for an example, any ip in the range 124.114.0.0 thru
> 124.115.255.255 times out so this is not a "busy" situation. 

$ dig -x 124.114.0.0 @ns2.xaonline.com.

; <<>> DiG 9.7.3 <<>> -x 124.114.0.0 @ns2.xaonline.com.
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 49606
;; flags: qr aa rd; QUERY: 1, ANSWER: 1, AUTHORITY: 2, ADDITIONAL: 2
;; WARNING: recursion requested but not available

;; QUESTION SECTION:
;0.0.114.124.in-addr.arpa.      IN      PTR

;; ANSWER SECTION:
0.0.114.124.in-addr.arpa. 43200 IN      PTR
0.0.114.124.broad.xa.sn.dynamic.163data.com.cn.

;; AUTHORITY SECTION:
114.124.in-addr.arpa.   43200   IN      NS      ns1.xaonline.com.
114.124.in-addr.arpa.   43200   IN      NS      ns2.xaonline.com.

;; ADDITIONAL SECTION:
ns1.xaonline.com.       86400   IN      A       202.100.4.15
ns2.xaonline.com.       86400   IN      A       61.134.3.11

;; Query time: 516 msec
;; SERVER: 61.134.3.11#53(61.134.3.11)
;; WHEN: Sun Jun 24 11:49:38 2012
;; MSG SIZE  rcvd: 182

$ dig -x 124.114.255.255 @ns1.xaonline.com.

; <<>> DiG 9.7.3 <<>> -x 124.114.255.255 @ns1.xaonline.com.
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 41200
;; flags: qr aa rd; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0
;; WARNING: recursion requested but not available

;; QUESTION SECTION:
;255.255.114.124.in-addr.arpa.  IN      PTR

;; AUTHORITY SECTION:
114.124.in-addr.arpa.   43200   IN      SOA     localhost.localdomain.
root.localhost.localdomain. 2007022012 10800 3600 604800 86400

;; Query time: 510 msec
;; SERVER: 202.100.4.15#53(202.100.4.15)
;; WHEN: Sun Jun 24 11:49:02 2012
;; MSG SIZE  rcvd: 108

Back to comp.os.linux.networking | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

"Timeout" DNS IP to name resolution buck <buck@private.mil> - 2012-06-23 17:56 +0000
  Re: "Timeout" DNS IP to name resolution Chris Davies <chris-usenet@roaima.co.uk> - 2012-06-23 22:29 +0100
    Re: "Timeout" DNS IP to name resolution buck <buck@private.mil> - 2012-06-24 01:05 +0000
      Re: "Timeout" DNS IP to name resolution Pascal Hambourg <boite-a-spam@plouf.fr.eu.org> - 2012-06-24 11:52 +0200
      Re: "Timeout" DNS IP to name resolution Chris Davies <chris-usenet@roaima.co.uk> - 2012-06-24 12:15 +0100
        Re: "Timeout" DNS IP to name resolution Moe Trin <ibuprofin@painkiller.example.tld.invalid> - 2012-06-24 11:09 -0500
          Re: "Timeout" DNS IP to name resolution buck <buck@private.mil> - 2012-06-24 19:50 +0000
            Re: "Timeout" DNS IP to name resolution Moe Trin <ibuprofin@painkiller.example.tld.invalid> - 2012-06-24 19:12 -0500
              Re: "Timeout" DNS IP to name resolution J G Miller <miller@yoyo.ORG> - 2012-06-25 10:22 +0000
  Re: "Timeout" DNS IP to name resolution MJ <me@invalid.org> - 2012-06-27 07:44 +0000
    Re: "Timeout" DNS IP to name resolution buck <buck@private.mil> - 2012-06-29 17:00 +0000
      Re: "Timeout" DNS IP to name resolution Joe Beanfish <joebeanfish@nospam.duh> - 2012-06-29 15:43 -0400
        Re: "Timeout" DNS IP to name resolution buck <buck@private.mil> - 2012-06-30 20:04 +0000
  Re: "Timeout" DNS IP to name resolution Martijn Lievaart <m@rtij.nl.invlalid> - 2012-06-30 00:58 +0200

csiph-web