Simulate 'try again' case Post: 302114720

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Special Forums IP Networking Simulate 'try again' case Post 302114720 by srinivasan_85 on Wednesday 18th of April 2007 07:02:43 AM

04-18-2007

Registered User

Simulate 'try again' case

Hi,
I was searching thro the topic and could not find a thread which zeroes in on the case i'm trying to simulate. Basically I have a need to simulate DNS Try again cases, without bringing the dns_sever down (by manipulating the entries in /etc/resolv.conf under 'nameserver' tag). I am so specific about doing this simulation without manipulating resolv.conf, because i have a program which would send UDP requests to dns_server (obviously the return value will be success as i doesnt check whether dns_server exists). In this case, I want dns_server to up, and tell my program when it gets a try again.

So is there a method by which i can simulate 'Host not found, try again' case without terminating nameserver?

PS: If I'm correct, resolv.c contacts the dns server at port 53 (default) to the IP addresses specified under nameserver tag of resolv.conf?

Thanks,
Srini

srinivasan_85

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LEARN ABOUT DEBIAN

desproxy-dns

desproxy-dns(1) 						   User Commands						   desproxy-dns(1)

NAME

       desproxy-dns - DNS for dynamic connections

SYNOPSIS

	  desproxy-dns dns_server proxy_host proxy_port

OPTIONS

       None

DESCRIPTION

       If you have direct DNS access then you don't need to do anything else.  You know you have direct DNS access if you can resolve host names
       to IP addresses.

       NOTE: as desproxy-dns listens in port 53 (which is less than 1024) you may need administrator privileges to exec desproxy-dns (in fact if
       you are running UN*X, you actually have to run desproxy-dns as root).

       OK, so you have a dns server accessible now. But your computer doesn't know anything about that. You must configure your network
       accordingly (again, need to be root in UN*X).

       Edit /etc/resolv.conf and add the line "nameserver 127.0.0.1". You don't have to restart anything. Just test ping and see if it works.

ENVIRONMENT

       None.

FILES

       None.

SEE ALSO

       dnsproxy(1), ping(1)

AUTHORS

       This manual page was written by Jari Aalto <jari.aalto@cante.net>, for the Debian GNU system (but may be used by others). Released under
       license GPL v2 or any later version.

desproxy-dns							    2012-03-26							   desproxy-dns(1)