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IP NETWORKING
HOW TO DO TRACEROUTE OF DNS LOOKUPS?
Tags
debugging, dig, dns, ip networking, lookup, traceroute
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Special Forums IP Networking How to do traceroute of DNS lookups?
# 1
10-04-2010
coolatt
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How to do traceroute of DNS lookups?
--------------------------------------------------------------------------------
hello,,
after googling a lot,, i still cannot find the answer to my problem.
i want to do a traceroute or a network debugging of dns lookups from a Mail
Server running on DEBIAN LENNY 5.0.
we have 2 routers in our office,, and i want to see through which of the routers
the dns lookups are done
can someone advise me how to ..... ??? Thanks,,,
--------------------------------------------------------------------------------
Last edited by coolatt; 10-04-2010 at 09:35 AM.. Reason: missing info
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# 2
10-04-2010
Neo
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You might try the dig utility. Should work for what you described.
Code:
+[no]trace
Toggle tracing of the delegation path from the root name servers
for the name being looked up. Tracing is disabled by default. When
tracing is enabled, dig makes iterative queries to resolve the name
being looked up. It will follow referrals from the root servers,
showing the answer from each server that was used to resolve the
lookup.
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# 3
10-04-2010
DGPickett
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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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# 4
10-07-2010
coolatt
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ok,,, thanks
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