Can't you have one of the DNS hosting services (like the dynamic ones) 
do port changes as well? IOW, I thought a couple of them at least 
offered with their pay services (~10/mo) the ability to take a FQDN of 
www(.yourdomain.com) and return real.ip.add.ress:81.

Thomas Mondoshawan Tate wrote:

> On Wed, Dec 05, 2001 at 12:48:35AM -0700, Rick Rosinski wrote:
> 
>>Are there any docs on changing the port to 81?  Others say it is a pain.  
>>WHy?  What are the consequences of changing the port?
>>
> 
> Yep. Read the docs at http://www.apache.org. It's not so much of a pain,
> really, just that people can't go to http://www.yourhost.com and see the
> page -- they have to go to http://www.yourhost.com:81. The consequences are
> that, since you're not using a standard port now, web browsers won't be able
> to communicate with the webserver software. As such, to even view the page,
> you have to specify the port in the URL (eg: http://www.yourhost.com:81).
> 
> All it takes (in Apache) is a change of the directive in httpd.conf that
> reads as "Port 80" to read "Port 81".
> 
>