subnetting

[Stiemy]

I've learned how to subnet logically but I'm confused about how the physical configuration of a subnet looks like.

Is a router required for subnetting? Can an AT&T 2Wire Gateway be used?


Say I have a network address of 192.168.1.0 Subnet mask: 255.255.255.0

I subnet that into two logical networks: 192.168.1.64 & 192.168.1.128 Subnet mask: 255.255.255.192


On my .128 segment, I can use node addresses 129-191

On my .64 segment, I can use node addresses 65-126


Say I want to use a node address of 70 on my .64 segment. So, the address would be 192.168.64.70 Subnet mask of 255.255.255.192

Where/how do I set this up? Do I have to configure each network segment on a router for this to work? Can I simply enter the addresses using Static addressing in the Operating System? How does this work physically?


I'm not trying to actually subnet anything, this is hypothetical. I just want to understand subnetting..

[cchooper]

I've learned how to subnet logically but I'm confused about how the physical configuration of a subnet looks like.

It doesn't look like anything. The IP layer (where subnetting takes place) is independent of the physical layer. Typically though, each subnet is placed in a separate broadcast segment. This is usually achieved through the use of separate, non-connected switches for each subnet or VLANs.

Is a router required for subnetting? Can an AT&T 2Wire Gateway be used?

If you want each subnet to be able to talk to each other, yes, a router is required. I don't know that the AT&T 2Wire Gateway is capable of, but in order for this to work the router has to be capable of listening on multiple IPs and subnets. Otherwise, you can use multiple routers as long as they share at least one common subnet. For example:

Router 1: 192.168.0.1/25 ------- 192.168.0.2/25 Router2 192.168.0.65/25 ----- Host1

Router 2 will also have to have Router 1 configured as its default gateway, and you'll also want Router 2 configured in 'Router mode' and not 'Gateway' mode (if it has such a thing, this basically means disable NAT.)

Where/how do I set this up? Do I have to configure each network segment on a router for this to work? Can I simply enter the addresses using Static addressing in the Operating System?

Yes, you can use static IP addresses, but you'll still want your router(s) configured in the manner mentioned above.

I hope this helps, let us know if you have any more questions.