All you need to know about Deployment Slot
https://azure.microsoft.com/en-us/documentation/articles/web-sites-staged-publishing/
And in order to prevent the access of your staging site to only white listed ips use following URL Rewrite rule.
<rule name="Block unauthorized traffic to staging sites" stopProcessing="true">
<match url=".*" />
<conditions>
<!-- Enter your staging site host name here as the pattern-->
<add input="{HTTP_HOST}" pattern="^ruslany\-staging\." />
<!-- Enter your white listed IP addresses -->
<add input="{REMOTE_ADDR}" pattern="123\.123\.123\.1" negate="true"/>
<!-- Add the white listed IP addresses with a new condition as seen below -->
<!-- <add input="{REMOTE_ADDR}" pattern="123\.123\.123\.2" negate="true"/> -->
</conditions>
<action type="CustomResponse" statusCode="403" statusReason="Forbidden"
statusDescription="Site is not accessible" />
</rule>
https://azure.microsoft.com/en-us/documentation/articles/web-sites-staged-publishing/
And in order to prevent the access of your staging site to only white listed ips use following URL Rewrite rule.
<rule name="Block unauthorized traffic to staging sites" stopProcessing="true">
<match url=".*" />
<conditions>
<!-- Enter your staging site host name here as the pattern-->
<add input="{HTTP_HOST}" pattern="^ruslany\-staging\." />
<!-- Enter your white listed IP addresses -->
<add input="{REMOTE_ADDR}" pattern="123\.123\.123\.1" negate="true"/>
<!-- Add the white listed IP addresses with a new condition as seen below -->
<!-- <add input="{REMOTE_ADDR}" pattern="123\.123\.123\.2" negate="true"/> -->
</conditions>
<action type="CustomResponse" statusCode="403" statusReason="Forbidden"
statusDescription="Site is not accessible" />
</rule>
