Nothing is wrong. IP subnet zero is not just about the first subnet. It is
about every subnet. That is why your addressing works fine. It is only the
first last and second to the last you can't use IN EACH SUBNET. Not the
subnets as a whole.
So
192.168.1.0 this is the subnet
192.168.1.1 valid
192.168.1.2 valid
....
...
192.168.1.63 broadcast
192.168.1.64 subnet
The last subnet works the same way.
192.168.1.192 subnet
192.168.1.193 valid
192.168.1.194 valid
....
...
192.168.1.254 valid
192.168.1.255 broadcast
-----Original Message-----
From: nobody@xxxxxxxxxxxxxx [mailto:nobody@xxxxxxxxxxxxxx]On Behalf Of
Ednilson Rosa
Sent: Friday, March 02, 2001 1:59 PM
To: associate@xxxxxxxxxxxxxx
Subject: Re: subnets [1:2277]
That's a good question. Be careful cause with addressing errors sometimes
things works fine almost of the time but problemas may appear later...
----- Original Message -----
From: "Paulo Roque"
To:
Sent: Friday, March 02, 2001 1:00 PM
Subject: Re: subnets [1:2277]
Hi all,
What about a class C network with mask /26, how many networks?
Let´s say 192.168.1.0/26
Well, it´s a class C address with 2 bits of subnet (26 - 24 from class C
standard mask). By using the (2^n)-2 rule we have: 2^2 = 4 - 2 = 2 subnets.
The subnets are:
192.168.1.0/26 invalid
192.168.1.64/26 valid
192.168.1.128/26 valid
192.168.1.192/26 invalid
With "ip subnet-zero" I can use the invalid subnet 192.168.1.0/26. So I will
have 3 subnets. However, here I use all 4 subnets and they work very well.
What´s wrong?
Paulo Roque
"Ednilson Rosa" escreveu na mensagem
news:200103020329.WAA28325@xxxxxxxxxxxxxxxxx
> Well, it´s a class A address with 5 bits of subnet (13 - 8 from class A
> standard mask). By using the (2^n)-2 rule we have: 2^5 = 32 - 2 = 30.
>
> Don´t forget you can´t assign all 0´s or all 1´s for both the host and the
> subnet portion of the address. That´s why you subtract 2 form the 32.
>
> But there´s a trick here: in fact you could have 31 subnets in a Cisco
> router if you used the "ip subnet-zero" command, which enables you to use
> the zero subnet, although this is not encouraged by Cisco.
>
> So, possible answers for this question would be 30 (most correct) and 31,
> but never 32...
>
> ER
>
> ----- Original Message -----
> From: "binoy sebastian"
> To:
> Sent: Friday, March 02, 2001 12:02 AM
> Subject: subnets [1:2277]
>
>
> This question may find silly for some of you.. Silly
> though, I find two different answers in two different
> books:
>
> how many subnets the following ipaddress has:
>
> 10.8.2.4/13
>
> One book says 32 another says 30
>
> =====
>
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