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!
beer9Asked:
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BlazConnect With a Mentor Commented:
VIP is a network address that is not the (primary) address of a physical network card. In the case of load balancing the VIP usually refers to the address that the client receives via DNS and connects to. The connections to this VIP address are actually intercepted by a (local) load balancing device which forwards the request to appropriate IP - end-point server (based on availability, load etc.).

I believe WIP is term used by F5 company, other term can be "global IP". It is actually VIP taken one step further - it is the address of the global load balancing device/service which redirect traffic to appropriate VIP - local load balancing device (based on availability, load, topology etc.).


http://support.dell.com/support/edocs/SOFTWARE/pebigip/3dns_admin.pdf
http://download.oracle.com/docs/cd/E11035_01/wls100/cluster/config_F5_in_MAN_WAN.html
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joolsCommented:
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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beer9Author Commented:
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!
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BlazCommented:
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)

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