Re: Resolving DNS Names


"SBN via WinServerKB.com" <u32166@uwe> wrote in message
news:728bf9f0dfa8b@xxxxxx
Herb Martin wrote:
Hey I need some clarification pls correct me if im wrong. Heres the
situation:
[quoted text clipped - 22 lines]
browser
the sequence will be CLIENT -> DNS SERVER -> DEFAULT GATEWAY -> INTERNET

IF the "Default Gateway" has a DNS server on it that can resolve the
Internet.

IF so, that is a very good way to do it.

- or will the client directly connect to the internet via the default
gateway

Connect? Yes, but lookup DNS directly? NO, it must NOT use any
DNS server which cannot resolve ALL of the (Internal) records needed
by the client.

if the LAN DNS Servers doesnt know the site?

No, the JOB of the "internal DNS server (set)" used by the clients must
know OR be able to FIND all the records the client will EVER
(legitimately)
need.

Usually by knowing the internal DNS records and forwarding for the
Internet
records.


Ok so basically the default gateway is just a node which is used to
connect
you to the internet?

Yes. It is a ROUTER to the Internet (in most cases). As such that is all
it does, BUT many default gateways have other jobs, some are actually
(caching only) DNS servers which take care of the Internet portion of
Name Resolution when your INTERNAL DNS Servers forward to it.

Think of these as two separate jobs though, even if they happen to be on
the same machine.

so in my pc if i will search for a site my computer will connect to the IP
address of a known default gateway configured to it, to be able to connect
to
the internet...right?

Route to the internet would be a better way to say it. You don't actually
connect TO the Internet, but rather ROUTE through it to connect to some
server or service on the Internet.

This is being picky with terminology but a lot of the mystery and difficulty
of networks can be removed if you are REALLY careful with your
terminology.

and then use the IP address of a known DNS servers also
configured to it, to be able find the site.

Right, the DNS resolves the name (of your desired site) to an IP address
and your machine uses that to "Route" the traffic (usually) through the
default gateway, and thus through the Internet to then reach that site you
were seeking.


--
Herb Martin, MCSE, MVP
http://www.LearnQuick.Com
(phone on web site)

--
Message posted via WinServerKB.com
http://www.winserverkb.com/Uwe/Forums.aspx/windows-server-dns/200705/1



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