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Subnetting

 
 
Alok Singh
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      08-04-2003
Hi All,

Please help me out understand this.

How come a subnet with 255.255.255.0 and another one of 255.0.0.0 can work
together? The ip address are like 192.168.1.2 and 192.168.1.3. The network
ids are different in this case but still i can share information for these
computers.

Any help would be appreciated.
Thanks in advance

Alok


 
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Consultant
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      08-04-2003
www.learntosubnet.com

"Alok Singh" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
> Hi All,
>
> Please help me out understand this.
>
> How come a subnet with 255.255.255.0 and another one of 255.0.0.0 can work
> together? The ip address are like 192.168.1.2 and 192.168.1.3. The network
> ids are different in this case but still i can share information for these
> computers.
>
> Any help would be appreciated.
> Thanks in advance
>
> Alok
>
>



 
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Zenner
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      08-04-2003
Because the 255.0.0.0 subnet mask includes hosts within the 255.255.255.0
network.

Any network with 192. *. *. * is part of 255.255.255.0
192.168.1.* is included in ".

However, some networks of the 255.0.0.0 subnet will not be available .

"Alok Singh" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
> Hi All,
>
> Please help me out understand this.
>
> How come a subnet with 255.255.255.0 and another one of 255.0.0.0 can work
> together? The ip address are like 192.168.1.2 and 192.168.1.3. The network
> ids are different in this case but still i can share information for these
> computers.
>
> Any help would be appreciated.
> Thanks in advance
>
> Alok
>
>



 
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Alok Singh
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      08-04-2003
ok got it. thanks a lot

alok

"Zenner" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
> Because the 255.0.0.0 subnet mask includes hosts within the 255.255.255.0
> network.
>
> Any network with 192. *. *. * is part of 255.255.255.0
> 192.168.1.* is included in ".
>
> However, some networks of the 255.0.0.0 subnet will not be available .
>
> "Alok Singh" <(E-Mail Removed)> wrote in message
> news:(E-Mail Removed)...
> > Hi All,
> >
> > Please help me out understand this.
> >
> > How come a subnet with 255.255.255.0 and another one of 255.0.0.0 can

work
> > together? The ip address are like 192.168.1.2 and 192.168.1.3. The

network
> > ids are different in this case but still i can share information for

these
> > computers.
> >
> > Any help would be appreciated.
> > Thanks in advance
> >
> > Alok
> >
> >

>
>



 
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Mocirne
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Posts: n/a
 
      08-05-2003
It's basically an addressing "hack". If ComputerA, with
192.168.1.2/24 sends a message to ComputerB, with
192.168.1.3/8, it'll send it addressed to 192.168.1.3/24.
Thus, according to ComputerA, the first 24 bits belongs to
the network, and 8 bits belongs to the host. ComputerB,
who thinks instead that the first 8 bits belongs to the
network, and 24 bits belongs to the host, picks it up. It
looks at the first 8 network bits, sees that it's 192,
looks at the remaining 24 host bits, sees that it's
168.1.3, and realizes that the packet belongs to it.
 
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Andy Foster
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      08-05-2003
<Top posting corrected>

> > "Alok Singh" <(E-Mail Removed)> wrote in message
> > news:(E-Mail Removed)...
> > > Hi All,
> > >
> > > Please help me out understand this.
> > >
> > > How come a subnet with 255.255.255.0 and another one of 255.0.0.0 can

> work
> > > together? The ip address are like 192.168.1.2 and 192.168.1.3. The

> network
> > > ids are different in this case but still i can share information for

> these
> > > computers.
> > >
> > > Any help would be appreciated.
> > > Thanks in advance
> > >
> > > Alok
> > >



"Kilo The MagnifiKat" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
> > Because the 255.0.0.0 subnet mask includes hosts within the

255.255.255.0
> > network.
> >
> > Any network with 192. *. *. * is part of 255.255.255.0
> > 192.168.1.* is included in ".
> >
> > However, some networks of the 255.0.0.0 subnet will not be available .
> >


> "Zenner" <(E-Mail Removed)> wrote in message
> news:(E-Mail Removed)...
> Could you expand on this a little bit more for me. It seems to me like

these
> are two different classes...class A and a class C subnets. Without a

router
> I don't understand how they would be able to communicate. 192-223 is a

class
> C range of address.In one instance 192.168.1.2 with a subnet mask
> 255.0.0.0? 255.0.0.0 already dictates that this is a class A address which
> runs from 1-126. I don't understand how you would get an IP address of 192
> to be using a class A subnet and be able to communicate.
> Thanks for your answer.


There are essentially 3 places a network resource can reside.

1. On your PC
2. On the local subnet - as defined by the subnet mask - your PC will
communicate directly with the resource PC
3. Outside the local subnet - as defined by the subnet mask - your PC will
communicate with the Default Gateway, for the packets to be forwarded

Your PC uses the subnet mask to determine whether it can find the resource
on the local subnet.
Class A,B and C address ranges haven't dictated subnet masks for a long
time - there aren't enough network addresses.
If a subnet mask is insufficiently restrictive eg. 255.0.0.0 when the
physical segment covers a 255.255.255.0 range, your PC will be able to
communicate with resources on the local subnet, but would expect to find
other resources on the local subnet instead of going through the default
gateway.

HTH

Andy


 
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