[Gllug] subnetting

[Michael Jenson]

OOps sorry for my gobbling :/
answer to this after this post
> 
> Well as others have said your question is not clear.
> 
> Taking 7 bits away from *what* makes for 8 subnets? Taking *three* bits 
> away from the host portion of an address and adding it to the network 
> portion will split one subnet into 8.
> 
> Within a subnet, only the first (network number) and last (broadcast) 
> addresses cannot be used for hosts. All 8 subnets can be used.
> 
> E.g you have a network 192.168.50.0/24. This has a subnet mask 
> 255.255.255.0, 24 bits in its network address and 8 bits in the host 
> address. 192.168.50.0 and 192.168.50.255 cannot be used for hosts, the 
> remaining 254 addresses can.
> 
> You can split this into 8 /27 networks by using a subnet mask of 
> 255.255.255.224, so you have 27 bits in the network portion of the 
> address and 5 in the host part. Your 8 networks are 192.168.50.0 - 
> 192.168.50.31, 192.168.50.32 - 192.168.50.63, etc. Again, the first and 
> last addresses in each subnet cannot be used, i.e. 192.168.50.0, 
> 192.168.50.31, 192.168.50.32, .. So you lose 14 addresses compared to 
> using the one /24. But the first subnet can be used - 192.168.50.1 - 
> 192.168.50.30 are all available for hosts.
> 
> There's a perl script called "ipcalc" which is often found on Linux 
> systems by default and can easily be found by googling which makes 
> subnet calculations very easy. It shows you all aspects of the subnet in 
> both decimal and binary and so it's quite a useful study aid too.
> 
> Regards, Ian
> 
Thanx Ian

My uni assignment is: Give customer 7 subnets using their network address  
200.100.99.0. Connect their present two locations in Kingston and Oxford 
via Inet. Sufice to say I have to use CISCO 2610 that is not sold in 
UK as new anymore. Would have to install extra ADSL an Ethernet module into 
WIC's to make this possible. And I presume more branch offices are on the way.

Your description is good. However I was told by my profesor at Uni the first
range 200.100.99.1 - 200.100.99.31/27 is not used?! :/? What is the reason for
that. IS this as with network address, here being network address range of the
subnets?!?  the one that describes,? gives subnets the base?   
THANX
-- 
mj


	
	
		
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