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Q: Route traffic between two webservers on demand I have two Windows webservers in VM environment, Beside using my firewall (no access) is there an easy and reliable way for me to re-route my incoming traffic to a specific server on demand?
Lets say all the public traffic goes to server-a, if I want my traffic to change to server-b. How can I do that? Right now, I have a little script that swaps the IPs so server-a will have server-b IP and server-b will have server-a IP. Is there a better way?
Thank you all

A: You need to use load balancing for this. Windows has NLB built in, but it lacks some features of hardware load balances. 

A: An alternative to Load Balancing is to rewrite all incoming requests to point to a maintenance page.
In IIS7+ you can do this easily by adding a file called app_offline.htm to the root of your website.  IIS will check for this file and, if it exists, will issue a HTTP/503 with the content of the app_offline.htm file.
Since you have tagged this Apache2, perhaps you can do this with a RewriteRule:
RewriteEngine On
RewriteCond %{ENV:REDIRECT_STATUS} != 503
RewriteRule ^(.*)$ /app_offline.htm [R=503,L]

(Note, Im not an Apache guy -- this was crudely adapted from https://stackoverflow.com/a/5447534/415523)
Just remember that, any images/scripts/CSS would need to be inline (or data URLs), or served externally (e.g. via a static.yourapp.example.org site or CDN), as they might also be subject to the rewrite.

user
In the text, there are 136 "e"s.
assistant