Allow www for multi-site main domain without redirecting

Hi – here is my situation….

I have a multi-site network running on a virtual private server at 1and1. Let’s say the domain is This is for a company that runs a windows network internally, and the windows domain is also called

Because of that, if someone inside the company types in their browser, their Windows DNS server sends them to the internal IP address. The only way I can get the company users to be able to access the external WPMU site, is to have them type

My question is how best can I do this? I tried to change this before, with not good results.

In the 1&1 Plesk panel, I have the preferred domain currently set to The other options are, and “none”.

I had previously tried to change it to, without changing anything else, and the site became inaccessible. This is what I think I have to do….

I think in wp-config I need to change DOMAIN_CURRENT_SITE to read

define(‘DOMAIN_CURRENT_SITE’, ‘’:wink:;

Do I need to rename the primary domain in the WPMU admin, under Network AdminSites?

I think in order to do that, I need to change this line:

define(‘BLOG_ID_CURRENT_SITE’, 1);

and change the 1 to another number, then rename site 1, then change it back to a 1.

In Plesk, I would change the preferred domain to

Is that how I accomplish what I want to do, or am I missing something?