.htaccess – 301 Rewrite

RewriteEngine On

RewriteRule ^index\.html$ http://www.DOMAIN.DOM/ [R=301,L]

RewriteCond %{HTTP_HOST} ^DOMAIN2\.DOM
RewriteRule ^(.*)$ http://www.DOMAIN.DOM/$1 [R=301,L]

RewriteCond %{HTTP_HOST} ^www\.DOMAIN2\.DOM
RewriteRule ^(.*)$ http://www.DOMAIN.DOM/$1 [R=301,L]