[SunRescue] IP and subnets and classes, oh my! Was:{Re: [SunRescue] Networking details (was Re: OT: Advice on Certification)}

[Gil Young]

There is a wonderful palm program that makes life easy, especially when 
messing around in IP and netmask hell.  It runs on the palm and is called 
ipcalc, well worth the money, IMHO.  One night, my brain was fried and I 
was trying to figure out a Cisco wildcard and this program, well, I feel it 
saved my life that night ....  ;}

Here is the link:

http://www.palmgear.com/software/showsoftware.cfm?sid=47788220010417142117&prodID=1188

Gil

At 10:26 AM 5/8/01 -0500, you wrote:
>Robert Novak wrote:
>
> > Well, 192.168.1.0/16 is a valid ip address and netmask. In the
> > 192.168.0.0/16 network, 192.168.0.0 is network and 192.168.255.255 is
> > broadcast, so anything else in the middle *could* be used.
> >
> > This may confuse systems that don't understand CIDR; we had some issues
> > with our /22 subnet internally at work, wherein the dhcp server assigned a
> > middle-appears-to-be-24-bit-network .255 address and it caused some
> > serious problems.
> >
> > Are we talking 192.0.0.0-223.255.255.0 networks that are /24 by default in
> > a classful network structure? That is the best definition of a Class C
> > *Network*, but I think "Class C Subnet" is clear enough to mean a /24
> > regardless of what it is a subnet of.
>
>Okay.  I don't have any formal training in networking but in all the books 
>I've
>read Class C was always refered to as the reserved address 
>192.168.0.0/24.  There
>wasn't anything about 192.0.0.0 0 233.255.255.0.  I understand what you are
>talking about but how are they supposed to know the right answer if they are
>taught the wrong answer?
>I personaly consider it a tragedy that someone actually taught these people
>something that is supposed to get them a pretty good job with resonable pay at
>least.  Then they teach them a load of crap that merely demonstrates there
>incompetence to interveiwers.
>
> > I'd be far more worried if someone didn't understand what I meant if I
> > said "break down 69.0.0.0/8 into class C subnets" ... and if someone in
> > an interview said "you can't do that because that's a class A network and
> > it's reserved anyway" I'd show them the door.
>
>I don't understand what you mean. :-)
>And realized again how much I really don't know.
>And how much I don't want to know. :-)
>But I suppose I'll have to learn it sometime.  Guess I'll be pulling out that
>networking book I've been hiding from.
>
>sim
>
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Gil Young
Call Sign: KG4KVX
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