You said: "It is possible to have multiple logical subnets on one physical
network, although not recommended. " Why not? The purpose here is to keep
customers from stealing Ips that are not theirs and causing IP conflicts
(Windows Servers die when that happens). Also, it prevents at least for low
level crackers, the ability to crack into a domain/machine if they are on
different logical subnets. They are on the same wire in that they all come
off the same switch which in turn is connected to the Ethernet on the
router.
In your exmaple of the two router configuration, ("Then on R2-E0, assign
address 63.142.137.33/27. ..."), how would packets know how to get to
63.142.137.2/30 from the .33 gateway). Sorry for the dumb wuestions, but
that is how I learn.
Thanx for your detailed explanations.
Anil Gupte
----- Original Message -----
From: "Chris Charlebois"
To:
Sent: Monday, February 25, 2002 1:25 PM
Subject: RE: Gateway/Network Address confusion [7:36400]
> OK, some terminology. We've got physical networks. They are bound by
> routers. Anytime a packet goes through a router, it is moving from one
> physical network to another. Then you have a logical subnet. This is what
> actually gets addressed. It is possible to have multiple logical subnets
on
> one physical network, although not recommended. Each device can only
> directly communicate with other members of the same logical subnet. A
> router would have to "translate" between the two logical subnets.
>
> Now, in the scenario you described, you have two logical subnets on one
> physical network (that's what the secondary address does). Also, the two
> logical subnets consume all your address space.
>
> You mentioned partitioning off subnets for customers. Does this mean each
> customer gets a seperate physical network? And do you need to provision
> networks for WAN links?
>
> Here would be one way to do it. Take the .137.X network off the main
router
> (Call it R1). Get a second router (R2) for this customer. Setup a
> point-to-point connection between the two. Now, R1-E0 has an address of
> 63.142.136.1/24. Assign R1-S0 to 63.142.137.1/30 and R2-S0 to
> 63.142.137.2/30. This is the WAN connection. Then on R2-E0, assign
address
> 63.142.137.33/27. The default gateway for the hosts on this network would
> be 63.142.137.33 and the broadcast would be 63.142.137.63. And on a
correct
> built network, the hosts (servers) never need to have route add commands.
>
> Now if you are doing this all on one router, you just need to add a
> secondary address of 63.142.137.33/27 (this would require you take off the
> 63.142.137.1/24 address first). This creates a logical subnet on your
> existing physical network.
>
> I hope this made some sense to you. If you have questions, I'll be
lurking
> around here somewhere.
Message Posted at:
http://www.groupstudy.com/form/read.php?f=7&i=36471&t=36400
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