[Gllug] subnetting

[Ian Northeast]

Mark Green wrote:
> The reason for this is because you are doing class based ip subnetting,

No he isn't. Classful subnetting does not permit /27. Using classful 
subnetting, the only permissible netmask in a network number starting 
200 is 255.255.255.0, /24. But, apart from being used to establish 
defaults, classful subnetting should not have been enforced for the last 
9 years since CIDR came out.

> using class c, address so 200.100.99.31/27 is the broadcast address,
> using this subnet scheme will give you 8 subnets how ever only 6 of them
> will be usable.

Would you care to explain this? Which 2 subnets would be unusable? Why?

Regards, Ian

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