Re: Think outside the GUI challenge #1
- From: "Jim Harrison" <Jim@xxxxxxxxxxxx>
- To: "[ISAserver.org Discussion List]" <isalist@xxxxxxxxxxxxx>
- Date: Wed, 28 Dec 2005 18:18:50 -0800
Now you bees playing in my old neighborhood (Tom, get your daughter in on
this). Let's not confuse "Hayes" with "modem".
A "modem" (Modulator / Demodulator) is nothing more than a signal translation
device, regardless of its intended application (DSL, dial-up access, AM radio,
etc.)
- In the MODulation function, it uses a baseband signal (CAT5 in this case) to
modify one or more aspects (phase, frequency, amplitude) of a carrier signal in
a predefined manner.
- In the DEModulator function, it performs a reverse process, extracting the
baseband signal from the modified carrier signal.
Here's a reasonably decent discussion on how DSL signals are propagated:
http://computer.howstuffworks.com/dsl4.htm
It's not "audible" audio, but it is audio, nonetheless...
--------------------------------------------
Jim Harrison
MCP(NT4, W2K), A+, Network+, PCG
http://isaserver.org/Jim_Harrison/
http://isatools.org
Read the help / books / articles!
--------------------------------------------
-----Original Message-----
From: Thor (Hammer of God) [mailto:thor@xxxxxxxxxxxxxxx]
Sent: Wednesday, December 28, 2005 5:47 PM
To: [ISAserver.org Discussion List]
Subject: [isalist] Re: Think outside the GUI challenge #1
http://www.ISAserver.org
It depends on your definition of "audio." If you mean that the signaling is
based on square waves of a fixed high and low amplitude at a particular
frequency being interpreted as a digital signal, then OK. But if you are
defining DSL's"audio" nature as the modulation of electromagnetic signals
into true "sound" (which is what a modem does) by creating signals of
amplitude, frequency and phase represented in the form of the typical
trigonometric sine and cosine wave (analog), then I must respectfully
disagree.
t
-----
"I may disapprove of what you say,
but I will defend to the death your
right to say it."
----- Original Message -----
From: "Jim Harrison" <Jim@xxxxxxxxxxxx>
To: "[ISAserver.org Discussion List]" <isalist@xxxxxxxxxxxxx>
Sent: Wednesday, December 28, 2005 4:55 PM
Subject: [isalist] Re: Think outside the GUI challenge #1
http://www.ISAserver.org
Ok, smarty-pants.
The CAT5 electrical signals that represent the Ethernet traffic are used to
modulate the audio between the modem & the DSLAM.
DSL is by nature, audio.
--------------------------------------------
Jim Harrison
MCP(NT4, W2K), A+, Network+, PCG
http://isaserver.org/Jim_Harrison/
http://isatools.org
Read the help / books / articles!
--------------------------------------------
-----Original Message-----
From: Thor (Hammer of God) [mailto:thor@xxxxxxxxxxxxxxx]
Sent: Wednesday, December 28, 2005 4:19 PM
To: [ISAserver.org Discussion List]
Subject: [isalist] Re: Think outside the GUI challenge #1
http://www.ISAserver.org
I'm going to pretend like I never read that. Ethernet signals are used to
modulate audio signals? I'll have a puff, please.
t
-----
"I may disapprove of what you say,
but I will defend to the death your
right to say it."
----- Original Message -----
From: "Jim Harrison" <Jim@xxxxxxxxxxxx>
To: "[ISAserver.org Discussion List]" <isalist@xxxxxxxxxxxxx>
Sent: Wednesday, December 28, 2005 3:41 PM
Subject: [isalist] Re: Think outside the GUI challenge #1
http://www.ISAserver.org
Actually, the ones that bridge Ethernet to telco are modems.
They use the Ethernet signals to modulate the audio signals carried to the
DSLAM.
--------------------------------------------
Jim Harrison
MCP(NT4, W2K), A+, Network+, PCG
http://isaserver.org/Jim_Harrison/
http://isatools.org
Read the help / books / articles!
--------------------------------------------
-----Original Message-----
From: Thor (Hammer of God) [mailto:thor@xxxxxxxxxxxxxxx]
Sent: Wednesday, December 28, 2005 1:13 PM
To: [ISAserver.org Discussion List]
Subject: [isalist] Re: Think outside the GUI challenge #1
http://www.ISAserver.org
Just like the marketroids call them "modems." There ain't a BIT o' analog
modulation a'goin on...
-----
"I may disapprove of what you say,
but I will defend to the death your
right to say it."
----- Original Message -----
From: "Jim Harrison" <Jim@xxxxxxxxxxxx>
To: "[ISAserver.org Discussion List]" <isalist@xxxxxxxxxxxxx>
Sent: Wednesday, December 28, 2005 12:48 PM
Subject: [isalist] Re: Think outside the GUI challenge #1
http://www.ISAserver.org
..but of course you have, oh Diva of SBS fame.
The marketroids call them "routers".
Sometimes they're part of the modem; sometimes not.
Sometimes they're configured for NAT, sometimes not.
When it's not NAT-ing, it's acting like a hub (bridge).
In this case, the only interesting part is that the device is configured as
a bridge.
--------------------------------------------
Jim Harrison
MCP(NT4, W2K), A+, Network+, PCG
http://isaserver.org/Jim_Harrison/
http://isatools.org
Read the help / books / articles!
--------------------------------------------
-----Original Message-----
From: Amy Babinchak [mailto:amy@xxxxxxxxxxxxxxxxxxxxxxxxxx]
Sent: Wednesday, December 28, 2005 12:37 PM
To: [ISAserver.org Discussion List]
Subject: [isalist] Re: Think outside the GUI challenge #1
http://www.ISAserver.org
What's a DSL bridge? I've never run into one of those in small business
land.
Amy
Harbor Computer Services
Small Business Computer Specialists
Client Blog: http://smalltechnotes.blogspot.com/
Tech Blog: http://isainsbs.blogspot.com/
Website: http://www.harborcomputerservices.net/
-----Original Message-----
From: Jim Harrison [mailto:Jim@xxxxxxxxxxxx]
Sent: Wednesday, December 28, 2005 3:10 PM
To: [ISAserver.org Discussion List]
Subject: [isalist] Re: Think outside the GUI challenge #1
http://www.ISAserver.org
Oooo..k.
Jeff gets step #1.
For those of us not "netsh-aware", the full command would be (assuming you
named the external interface "north"):
- netsh int ip add addr north 10.0.0.1 255.255.255.0
Alexandre gets "most sickliest response". :-p
To continue the challenge, answer the following questions:
1. why doesn't it work yet?
2. what non-GUI step must be taken to make it work?
..remember; ISA policies are not interesting yet.
--------------------------------------------
Jim Harrison
MCP(NT4, W2K), A+, Network+, PCG
http://isaserver.org/Jim_Harrison/
http://isatools.org
Read the help / books / articles!
--------------------------------------------
-----Original Message-----
From: Alexandre Gauthier [mailto:gauthiera@xxxxxxxxxxxxxxxxx]
Sent: Wednesday, December 28, 2005 12:01 PM
To: [ISAserver.org Discussion List]
Subject: [isalist] Re: Think outside the GUI challenge #1
http://www.ISAserver.org
Your answer makes me moist in my special places.
-----Message d'origine-----
De : Bunting, Jeff [mailto:BUNTING@xxxxxxxxxxxx]
Envoyé : 28 décembre 2005 14:58
À : [ISAserver.org Discussion List]
Objet : [isalist] Re: Think outside the GUI challenge #1
http://www.ISAserver.org
how about with
netsh interface ip add address
Jeff
-----Original Message-----
From: Jim Harrison [mailto:Jim@xxxxxxxxxxxx]
Sent: Wednesday, December 28, 2005 2:29 PM
To: [ISAserver.org Discussion List]
Subject: [isalist] Re: Think outside the GUI challenge #1
http://www.ISAserver.org
Remember; this is the "out of the GUI" challenge.
How would you accomplish item 1 from the command line?
Also, it still won't work (incomplete).
What other non-ISA, non-GUI steps must be taken?
#2 answered correctly.
--------------------------------------------
Jim Harrison
MCP(NT4, W2K), A+, Network+, PCG
http://isaserver.org/Jim_Harrison/
http://isatools.org
Read the help / books / articles!
--------------------------------------------
-----Original Message-----
From: Roy Tsao [mailto:roy_tsao@xxxxxxxxxxxx]
Sent: Wednesday, December 28, 2005 11:07 AM
To: [ISAserver.org Discussion List]
Subject: [isalist] Re: Think outside the GUI challenge #1
http://www.ISAserver.org
1) Bind a additional static IP 10.0.0.X/24 to ISA External Interface
2) In case of dynamic IP, static IP can't assign as per 1)
> Merry Xmas & Happy New Year!
>
> In the spirit of giving, here's a "think outside the GUI" challenge
for
> you.
>
> Scenario:
> - ISA is connected directly to the Internet via a "manageable" DSL
> bridge
> - ISA uses 123.123.123.123/24 static external IP; DG = 123.123.123.1
> - Internal LAN uses 10.9.8.x/24
> - DSL bridge has unchangeable 10.0.0.2/24 internal IP
> - DSL bridge offers web-based management on that internal IP
>
> Internet
> |
> DSL Bridge
> |- 10.0.0.2/24
> |- 123.123.123.123/24
> ISA
> |- 10.9.8.x/24
> LAN
>
> Note:
> - The DSL bridge internal IP is irrelevant to normal Internet access.
> Because it's operating in "bridge" (as opposed to NAT) mode, it's
> effectively transparent to the ISA for Internet traffic.
>
> Challenges:
> 1. Allow either ISA-local or ISA-internal to access the DSL bridge web
> interface 2. Explain why the correct solution is impossible to
> implement if the ISP provides a dynamic IP.
>
> Hint:
> - The core of the solution has nothing whatsoever to do with ISA
itself.
>
> --------------------------------------------
> Jim Harrison
> MCP(NT4, W2K), A+, Network+, PCG
> http://isaserver.org/Jim_Harrison/
> http://isatools.org
> Read the help / books / articles!
> --------------------------------------------
>
>
> All mail to and from this domain is GFI-scanned.
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