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Full Discussion: How to do traceroute of DNS lookups?
Special Forums IP Networking How to do traceroute of DNS lookups? Post 302459490 by DGPickett on Monday 4th of October 2010 07:51:01 PM
Old 10-04-2010
nslookup with debug on will tell you where it goes. Usually the local dns talks to the ISP dns as a local root, and usually is on the internet and can do without recursion, perhaps must under the isp contract. This way, the isp tells you the root servers and you go off on your own to their children. If the roots change, the changes trickle down.

traceroute from the dns host of the DNS server IPs will tell you where the network path is, going out. It may vary depending on where the next DNS server is.

(nslookup with server name allows you to route dns direct to a specific name server, if you want to compare responses.)
 

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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)
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