Difference between Netscaler SNIP and a VIP?

Just trying to understand the difference between these two.  I understand exactly what a VIP is, but my confusion is over how / why SNIPs come in to play, as they seem to have the same concept.  Is it just a matter of the VIP is client accessible and the SNIP is Netscaler accessible?

Thanks in advance
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Sekar ChinnakannuStaff EngineerCommented:
btanExec ConsultantCommented:
in fact, there are many terminology that need to be understood as a whole
- NSIP (NetScaler IP Address) is really just an IP address used by Administrator to manage NS, it is mandatory and single one  exist only.
- SNIP (Subnet IP Address) is used for server side connections. Meaning it is used to route traffic from, or through, NS to a subnet directly connected to NS. It is seen as source IP (from NS) and not mandatory.
- MIP (Mapped IP Address) is same as SNIP. Just that it exists when SNIP does not exist (disabled or not used)
- VIP address (Virtual IP Address) is VIP IP address. Kinda of client facing IP of NS as you rightly stated in the use case. It is not involved with NS backend servers' communication, which is handled by SNIP or MIP.

In short, I see them as below
for mgmt. end, NS uses NSIP;
for client end - NS uses VIP;
for server end, NS uses SNIP or MIP.

The diagram is nice summary as well.

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blinkme323Author Commented:
Thanks for the responses thus far.  So the SNIP is essentially a pass-thru address for a particular subnet that contains one or more servers that are in the NS in question?
btanExec ConsultantCommented:
yes it is the NS source IP address assigned sending to the server in that subnet
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