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Supernetting?

By shannons4um ·
What is supernetting exactly? Is it the reverse of subnetting? Is there such a term as supernet mask opposite of subnet mask?

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Supernetting?

by turambar386 In reply to Supernetting?

Hi Shannon. I guess that supernetting could
be described as the opposite of subnetting.

In general it refers to the aggregating of
any routes. In practice, it usually means
the grouping together of multiple continuous
class C networks and is often also known as
CIDR or classless interdomain routing.

I've never seen the term 'supernet mask'.
Usually its called a variable length subnet
mask or VLSM. An example would be
192.168.8.0/21 where the /21 indicates that
21 bits are being used as the network mask.

Hope this clears things up a bit.

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Supernetting?

by shannons4um In reply to Supernetting?

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Supernetting?

by flyfshmn In reply to Supernetting?

Supernetting borrows bits from the network id and masks them as the host id for efficient routing. This allows the InterNIC to hand out the less popular class C address and still allow for large amounts of hosts. Supernetting is used when multiple, consecutive network addresses of the same Class are combined into blocks. For example, if you need to assign 199.1.1.x and 199.1.2.x to the same physical network and want to change subnet mask. You would use the subnet mask of 255.255.254.0. To use supernetting, the IP network addresses that are to be combined must share the same high-order bits, and the subnet mask is "shortened" to take bits away from the network portion of the address and add them to the host portion. I have never heard of a supernet mask.

Also check out this link from TechNet..
http://www.microsoft.com/TechNet/winnt/reskit/sur_tcp2.asp

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Supernetting?

by shannons4um In reply to Supernetting?

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by shannons4um In reply to Supernetting?

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