Re: WAN/LAN IP Address
From: Scooby (mmscooby1_at_removeme.earthlink.net)
Date: 12/09/04
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Date: Thu, 9 Dec 2004 08:48:53 -0500
"Enno Lenze" <2004-12@spam.verbrennung.org> wrote in message
news:31qqjbF3e13boU1@individual.net...
> AlanNg wrote:
> > is configured same as the subnet address,ie. 224, isn't there a conflict
?!
>
> no, it isn't :) the subnet mask isn't an adress or someting like that.
> it's only a "rule" how many adresses you can allocate. Simple reminder:
> subtract the subnetmask from 255.255.255.255 and you know how much hosts
> you have.
Yes, there is a conflict. This should NEVER be done. I'm usually a fan of
never say never, but don't do this. In fact, I'm not even sure how they
were able to configure the equipment as such, since the IOS barks out errors
when you try to put two interfaces on the same network. The ONLY exception
to this rule would be if they were bridging the interfaces together, but if
they were doing that, the subnet masks should match as well. This is just a
bad setup.
>
> > - How is subnet address being used, assign to where/what ?!
>
> it is used in cobination with teh ip-address i.e.
> 192.168.0.1 subnetmask 255.255.255.0 means:
> in the first three blocks you can cahnge 0 things (remember my lines
> above: 255-255=0, you have 0 other possibilities)
> the last block in the subntmask is 0 (as above 255-0=255, so you have
> 255 possibilties in the last block).
>
> means:
> you can allocate 192.168.0.1 - 192.168.0.255
>
> (hope you unterstand what i want to say, yo tired to explain it better)
That says it.
>
> > - What is the LAN IP for, in the case of router, I thought router should
> > only have one IP address ?!
>
> no, the router needs one adress in each network, because the different
> networks cant communicate. i.e.:
> you have two school classes. both can see the teacher. each class can
> see the member of its class, but not the other. the teacher is the
> router, because he's visible for both, he has to give the informations
> from one room (subnet) to the other
>
> > - Hub is defined in layer 1 or 2 of OSI ?!
>
> dunno
Layer 1
>
> > - Can we identify the class of an IP address by the first octet of the
> > address, ie. 1-126 must be in class A, 128-191 must be in class B and
so
> > on, without the need to pay attention to its subnet mask ?!
>
> well..yes and no ;)
> long long time ago that was the plan, but today you have to use the
> subnetmask to know your network size.
>
You've always had to use the subnet mask in conjunction with the ip address
(maybe in some cases it was not visible to the person configuring the
equipment), and you've always been able to subnet. The classes still exist
today as well. What CIDR and VLSM introduced is that you can now subnet
beyond class boundaries. There is still equipment out there there requires
a n*8 bit subnet mask, but now most equipment can have any length subnet
mask.
> > Please pardon me if I ask silly questions as I'm rather new to these
area,
> > and hope to rx help asap, thanks !
>
> no question is silly, communication is what usenet is about :)
>
> regards, enno
>
> --
> http://www.verbrennung.org
Jim
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