Citrix Netscaler Virtual Server and Access Gateway

In Netscaler , I have seen some administrator configuring Virtual server and  Access gateway server as 2 different servers.
Well Access Gateway is used by external users, I wonder if Virtual server is aimed to be used by internal users ?
Though I still believe the Virtual Server is used only for High Availability, but if one Node goes down how do users find the Access Gateway ?

Thanks
jskfanAsked:
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amichaellCommented:
An Access Gateway is really just a different type of virtual server.  Access Gateway is used for ICA proxy to allow remote users to access Citrix resources.  Virtual servers are used as front ends for other services, such as DNS, StoreFront (WWW), LDAP, etc.  Virtual servers are good as they can provide for high availability and load balancing of those services.

The Access Gateway virtual server will often communicate with other virtual servers, such as a virtual server configured for StoreFront.

The Access Gateway virtual server is made redundant by having two NetScalers configured in high availability.
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mburdickCommented:
Sometimes, the two are used in combination with each other. For example, the Gateway vServer may communicate with multiple StoreFront servers which are front-ended by a more 'traditional' vServer.

In the current version of the firmware, these lines are blurred just a little bit more as you now can front-end a Gateway vServer with a traditional vServer and use content switching to redirect the traffic to the appropriate location - including "landing" on a Gateway vServer if the connection is coming from a Receiver client.
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jskfanAuthor Commented:
Thank you
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