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What is VIP ( Virtual IP ) and WIP (Wide IP)?

Hello, I would like to understand what is VIP ( Virtual IP ) and WIP (Wide IP)? and how do we use it with the load balancer. Please give me some reference to understand it more. Thanks!

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Blaz

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Julian Parker

http://en.m.wikipedia.org/wiki/Virtual_IP_address

I can't seem to paste a link for wip using my mobile.:-(

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Julian Parker

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beer9

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Thanks for the link,.. I would like to understand more on how the transaction between a VIP and all the hosts it represents happens. Please provide some link/documentation in order to understand it more. Thanks!

Blaz

It depends on the technology you want to use - there are many.

As far as I know there are at least two general types:
- all the servers have assigned VIP and all receive every request - then they have an algorithm to determine which server will respond to the request (Microsoft NLB works like this for example - http://technet.microsoft.com/en-us/library/bb742455.aspx)

- A seperate server (load balancing device) has the VIP assigned. When receiving a request it determines to which server it will forward request and then forwards it to that server only (the mentioned F5 company uses this principle - http://www.radharc.com/whitepapers/Server_Load_Balancing.pdf)