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The only real advantage to using VLSM in a network with private IPs would be in route summarization. However: to most network engineers using a /24 subnet for a point to point router connection would bother them on a fundamental level, even if they have the IPs to do it.<br />

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The only real advantage to using VLSM in a network with private IPs would be in route summarization. However: to most network engineers using a /24 subnet for a point to point router connection would bother them on a fundamental level, even if they have the IPs to do it.


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thanks Sniper, <br />
So your saying you would use a VLSM on the interfaces connecting the routers?<br />
<br />
So if you had 10 interfaces connecting routers you would use VLSM to create a suitable IP range ?<br />
<br />

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thanks Sniper,
So your saying you would use a VLSM on the interfaces connecting the routers?

So if you had 10 interfaces connecting routers you would use VLSM to create a suitable IP range ?



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Thanks you for your help - &nbsp;makes sense
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Hi <br />
If the recommended number of nodes in a subnet is no more than 512. Why do people mess with the subnetmask to create variable length subnetmasks (private IP's)?<br />
<br />
Why not use multiple subnets as below and stick routers in between<br />
10.1.0.0 <br />
255.255.0.0<br />
Or<br />
10.1.1.0<br />
255.255.255.0<br />
<br />
With standard subnetmasks you can look at the IP and subnetmask and visually know if two addresses are on the same network. But when using variable length subnetmasks you need to do the working out. <br />
<br />
I understand it's useful with public IP's, There must be an advantage in private LANs<br />
<br />
<br />
Would appreciate someones help<br />
<br />
<br />

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Hi 
If the recommended number of nodes in a subnet is no more than 512. Why do people mess with the subnetmask to create variable length subnetmasks (private IP's)?

Why not use multiple subnets as below and stick routers in between
10.1.0.0 
255.255.0.0
Or
10.1.1.0
255.255.255.0

With standard subnetmasks you can look at the IP and subnetmask and visually know if two addresses are on the same network. But when using variable length subnetmasks you need to do the working out. 

I understand it's useful with public IP's, There must be an advantage in private LANs


Would appreciate someones help




In a Private LAN why use variable length subnetmask?

A router is a networking device that forwards data packets between computer networks. Routers perform the "traffic directing" functions on the Internet. The most familiar type of routers are home and small office cable or DSL routers that simply pass data, such as web pages, email, IM, and videos between computers and the Internet. More sophisticated routers, such as enterprise routers, connect large business or ISP networks up to the powerful core routers that forward data at high speed along the optical fiber lines of the Internet backbone. Though routers are typically dedicated hardware devices, use of software-based routers has grown increasingly common.

Routers

Network design and methodology, also known as network architecture, is the design of a communication network. It is a framework for the specification of a network's physical components and their functional organization and configuration, its operational principles and procedures, as well as data formats used in its operation. In telecommunication, the specification of a network architecture may also include a detailed description of products and services delivered via a communications network, as well as detailed rate and billing structures under which services are compensated.

Network Architecture

Transmission Control Protocol/Internet Protocol (TCP/IP) is the set of networking protocols that define end-to-end connectivity specifying how data should be packeted, addressed, transmitted, routed and received at the destination. This functionality is organized into four abstraction layers which are used to sort all related protocols according to the scope of networking involved.