Re: Subnetmask Issues
- From: Poppen <Poppen@xxxxxxxxxxxxxxxxxxxxxxxxx>
- Date: Tue, 6 Sep 2005 09:27:16 -0700
Thank you Bill
This has helped me to clear a lot of grey areas releted to
subnetting and routing of packets
--
make the change
"Bill Grant" wrote:
> It depends on where the machines are. If a client sends a packet to a
> another machine which is in the same IP subnet, the router is not involved
> at all. The packet is delivered directly (ie "on the wire" using the
> machine's hardware or MAC address). It the target machine is not in the
> same IP subnet as the sender, the packet will be sent to the router which
> can deliver the packet directly (because the router has an interface in the
> "other" subnet).
>
> Poppen wrote:
> > Hi
> > Thank you for the information. I learn that for two networks all i
> > need to do is configure the two networks as 171.107.1.0 /24 and
> > 171.107.2.0 /24 at the two network interfaces. I do not have to worry
> > about the subnetmasks. The router would by default select the
> > subnetmask, which will be the same for both the networks of /24
> > subnets. That being the case (router would by default select the
> > subnetmask ) .
> > How would the router identify the specific network in which the client
> > resides.
> > For example, i send a packet to 171.107.1.1 client . How would a
> > router interpret this packet. Will it take all the three octets
> > 171,107,1 and route the packet or is there anything to do with
> > subnet mask here.
> >
> >
> >> Getting close, but not quite right yet. The subnet mask defines
> >> how much of the address defines the network. So with a 24-bit subnet
> >> mask, the first 24 bits are network definition and the remaning 8
> >> define the host. So all addresses beginning with 171.107.1 are in
> >> the same subnet, and you can have 254 of them from 1 to 254 . Zero
> >> and 255 are reserved. Zero is used to define the subnet itself and
> >> 255 is a broadcast address.
> >>
> >> To have two subnets of 254 hosts starting with 171.107, the
> >> third octet would need to be different. For example you could use 1
> >> and 2. Subnet one would be the subnet 171.107.1 0/24 containing the
> >> host addresses 171.107.1.1 through 171.107.1.254 . The second subnet
> >> would be 171.107.2.0/24, containing 171.107.2.1 to 171.107.2.254 .
> >>
> >> Poppen wrote:
> >>> HI
> >>> I have an academic question related to subnet masking. I
> >>> understand that the individual subnets are diffrentiated with the
> >>> aid of subnet masks. So when you do a subnetting of 171.107.1.0 /24
> >>> . The networks are 171.107.1.0 , 171.107.1.1 till 171.107.1.255 .
> >>> The sunet mask for these n/w will be 255.255.255.0 .
> >>> I want to configure 2 subnets , lets say 171.107.1.1 and
> >>> 171.107.1.2 . I am not sure how will I give the subnetmasks at the
> >>> router for these networks.
>
>
>
.
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- From: Poppen
- Re: Subnetmask Issues
- From: Bill Grant
- Re: Subnetmask Issues
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