So at first I would 302 (yes 302) redirect all phpBB2 content to a flat .html file announcing that your forum will be back again in a few.
The 302 won't tell bots to drop the initial url, so that search engine should try them again until they'll get redirect to the final phpBB3 ones with the same content as before.
Another way of doing it would be to use a 503 header, should more or less be the same.
This could be done by adding and index.html file in your domain's root (example.com/index.html), and use this in the domain's root .htaccess
- Code: Select all
RewriteRule ^/?.+$ / [R=302,L][/code]
- Code: Select all
RewriteRule ^/?.+$ / [R=503,L]
For a 503.
Then, you can convert to phpBB3 and remove that code as soon as it is done.
To do this you have several options. I don't know if your phpBB2 was using url rewriting and if you plan to use some with phpBB3, but you should know that since phpBB2 urls are a bit different from phpBB3 (topic use forum id in url), if you go from phpBB2 with no url rewriting to phpBB3 with no url rewriting you will end up with many more duplicates (phpBB2 urls still will work as before, but phpBB3 will display different urls without redirection).
It's totally different with url rewriting in phpBB3 with our Zero duplicate
If phpBB2 was no using url rewriting, redirection will be as simple as turn the zero dupe on with the post redirection option set to at least guest. If phpBB2 was using url rewriting, then, you will need to additionally keep some of the phpBB2 rewriterules in you phpBB3 .htaccess to allow the zero dupe to handle all redirections (if so, post your phpBB2 .htaccess here).
So before you provide with more info, I strongly encourage you to give a local try
to our SEO premod
. It's quick way to find out all the possibilities offered by our SEO mods here and to decide what to do.
You can use the premod to convert your phpBB2, or decide to only install the mods you want to use separately on a vanilla phpBB3. Though, the premod can be handy since we provide with the same update packages as phpBB but with our mod's updates in them. This makes update easier because you only have to worry about additional mods you may use, not the seo mods themselves.