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echo: novell
to: ALAN FRAYER
from: KRISTIAN RASMUSSEN
date: 1998-05-23 01:59:00
subject: Ip subnets

AY> It seems we need to sub-sub-net if there is such a thing. I browsed thru
AY> the online docs but my i couldn't seem to find an answer to this problem.
AF> This is because you can't sub-subnet.
Of course you can, it's just a matter of manipulating the subnet mask. He 
won't be able to use the recommended address address ranges for servers etc, 
but otherwise it should work.
Unfortunately, one cannot divide an address range in five chunks of equal 
size. One solution would be to use 8 subnets and bind multiple addresses to 
three of the NICs, but that creates a problem with DHCP.
Now, a subnet mask of 255.255.255.192 gives 4 subnets with 62 addresses each. 
The question is, can one use 255.255.255.192 on three of the cards and split 
the last subnet in two, using 255.255.255.224?
This just might work:
NIC #1:
Net: 10.85.113.0
Broadcast: 10.85.113.63
Subnet mask: 255.255.255.192
Address range: 10.85.113.1 - 10.85.113.62
NIC #2:
Net: 10.85.113.64
Broadcast: 10.85.113.127
Subnet mask: 255.255.255.192
Address range: 10.85.113.65 - 10.85.113.126
NIC #3:
Net: 10.85.113.128
Broadcast: 10.85.113.191
Subnet mask: 255.255.255.192
Address range: 10.85.113.129 - 10.85.113.190
NIC #4:
Net: 10.85.113.192
Broadcast: 10.85.113.223
Subnet mask: 255.255.255.224
Address range: 10.85.113.193 - 10.85.113.223
NIC #5:
Net: 10.85.113.224
Broadcast: 10.85.113.255
Subnet mask: 255.255.255.224
Address range: 10.85.113.225 - 10.85.113.254
As to how to configures DHCP in a multi-interface setup like this, I have no 
idea. Besides, my head hurts. :)
AF> NetWare servers automatically act as routers when you install multiple
AF> NICs in them.
Not unless you turn on IP forwarding, which is what he'll have to do. He'll 
also have to set up a default route to the router acting as a gateway 
to...well, whatever net he is connected to.
AF> To use those addresses, you may need to redesign your network to
AF> place your users on the same subnet, using bridges to separate
AF> segments, instead of routers.
Using bridges is certainly an attractive solution. Saves a lot of 
configuration and a bunch of IP addresses as well. But can Netware act as a 
bridge? And will broadcasts (such as a DHCP request) travel across a bridge?
AF> Alternatively, you may wish to consider using an IP/IPX gateway,
That should work too.
- KR -
--- BBBS/NT v3.42 ToMmIk-4v
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