Re: >>Two XPs can't see each other<<
From: Wayne B. (Mrcmosdriver_at_aolnott.com)
Date: 02/20/04
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Date: Fri, 20 Feb 2004 15:17:40 -0800
I've been told that a router would be needed for ICS.
Since I have a switch linking these systems together, I
figured that I wouldn't be able to get that done until I
purchased one.
Everything that you detailed out for me is pretty much
how I had it understood. (Guess I didn't fall asleep as
much as I thought I did during classes)
I guess my only foggy point is, is >DNS< as well as
APIPA default services that run on 98, Win2k and XP? I
ask that because, lets say for instance, if you put a LAN
together without any of the machines touching the
internet, IPs are still distributed out (via APIPA) to
each machine that requests an IP. But, is name resolution
present from the beginning (which is what I believe) or
does it have to be installed and ran? I'm not sure on
that because there is not one time that I remember
installing DNS on my machines.
Thanx Again, Wayne B.
>
>Here's what typically happens (simplified quite a bit):
>
>First event: you (or somebody acting for you, such as
the vendor who
>installed XP) gave your PC a name. Second event: an
IPA was given
>to your PC, either by you assigning a static IPA, or by
your PC's
>asking and being given an IPA by a DHCP server, or by
your PC's giving
>itself an APIPA after a failed attempt to get an IPA
from a DHCP
>server. Third event: your PC registers itself with a
DNS server by
>announcing its name and IPA. Note that the DNS server
and the DHCP
>server are software entities which may or may not reside
on the same
>hunk of hardware. Also note that events 1-3 happen for
each PC.
>
>Fourth event: when you command your source PC to
communicate with
>a target PC (by, say, PING PC123) on your LAN, your
source PC sends
>a request to the DNS server to translate the target PC's
name (PC123)
>into the IPA for that PC; if translation succeeds, then
the source PC
>uses the IPA of the target PC as the target for packets
sent over the
>network (your LAN, in the case of interest).
>
>I assume that your XP PRO PC is a gateway to the
internet for your
>other PCs, and that your LAN is controlled by ICS (with
the XP PRO PC as
>the ICS host and the other PCs as ICS clients). If
that's true, then
>that ICS host is the DHCP server and the (real or
virtual) DNS server.
>ICS is hard-wired to use 192.168.x.y for its LAN. Also,
your XP PRO PC
>has a separate IPA to use on its WAN-side, which it gets
by a similar
>process (usually DHCP) from your dial-up ISP.
>
>Caveat: The details of address assignment and address
translation
>vary a lot, depending on the protocol(s) used. If you
want to really
>understand how it works, a good starting point is
Cisco's handbook:
>http://www.cisco.com/univercd/cc/td/doc/cisintwk/ito_doc/
index.htm
>--
>Cheers, Bob
>
>.
>
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