Transcript Slides

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Top level domains
. (root)
.com
.org
.net
.gov
.ca
.uk
Second level domains
minasi.com
microsoft.com
hq.minasi.com
test.minasi.com
doj.gov
waco.doj.gov
mswatch.doj.gov
“sub-domains” or “child domains”
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what's involved with DNS server setup?
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* (it's not really 13 but we'll see that in a bit)
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What's the IP address
for a.bigfirm.com?
Send it to my port 3351
and specify
transaction ID (TXID)
279 when you do.
(The port number and
TXID are random
numbers with values
ranging up to 65,535.)
web2.minasi.com
"Answer: 73.165.73.5"
ISPDNS
sent to port 3351, TXID 279
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side-effects: the 13 conundrum
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secondary effects: firewall troubles
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(based on a true story)
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wait, don't run away…
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just to keep things clean
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Then, start up Network Monitor and
see a screen that looks something
like this (without the Teredo and
Isatap NICs):
Select the NICs you care about
and whether or not you want
"promiscuous mode"
Phase 2: window cleanup
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Just the good stuff.
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One question, no answers, no
authority ("Name
ServerCount," no additionals
The Question!
Question: "hey, root, ever heard of
a.bigfirm.com?"
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The question count just
parrots back the question.
There is no answer.
The "authority section"
offers hints about where
to ask the question NEXT
with the .com DNS server
names.
The "additional" section
saves you the trouble of
having to look up their
IPv4 and IPv6 addresses.
Response: "um, no, but you should next check the .com DNS
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servers – here are their names and IP addresses"
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"I don't have the
answer, but go ask
web2.minasi.com, it
will be able to answer
your question"
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Note the
"DnsOverTcp"
protocol reference
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several reasons, actually
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