It is essential that the same content is found only under single URL. Alias URLs should be redirected to the main URL. Otherwise you may get "duplicate content penalty" by Google which gets your site lower on search results. E.g. if you have domains www.foobar.com and www.foobar.net, you want the .net to be forwared to the .com.
On IIS 7 redirection can be made by following steps:
1. Install IIS 7 Rewrite Module (Requires Reboot!)
2. Edit web.config file of your site. The code should be put under <system.webServer> element. The following example redirects from www.foobar.net, foobar.net and foobar.com to www.foobar.com.
<rewrite>
<rules>
<rule name="Redirect to www.foobar.com" stopProcessing="true">
<match url=".*" />
<conditions logicalGrouping="MatchAny">
<add input="{HTTP_HOST}" pattern="^foobar\.net$" />
<add input="{HTTP_HOST}" pattern="^www\.foobar\.net$" />
<add input="{HTTP_HOST}" pattern="^foobar\.com$" />
</conditions>
<action type="Redirect" url="http://www.foobar.com/{R:0}" redirectType="Permanent" />
</rule>
</rules>
</rewrite>
Note that redirectType should be "Permanent". This creates "301 Moved Permanently" redirection which is most SEO friendly.
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