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It would be quite the job to do that, but I suppose it's possible... You'd have to edit quite alot of queries tho.

Thanks Smartys and elbekko. Then I will test punBB.

Might I run into other problems setting this to 0.0.0.0? Are there things like spam-filters that can stop multiple posts from the same IP? Would making it return a hash or encrypted IP be better?

I am always a bit sceptical to making such changes to the source, since it might make upgrading a lot more difficult. If we make such a change, and integrate it as a user-selectable option, could it be submitted to your CVS?

we had to revisited this issue today, so for reference, this is what you change:

in include/functions.php, around line 680

// Try to determine the correct remote IP-address
//
function get_remote_address()
{
    //return $_SERVER['REMOTE_ADDR'];
    return "127.0.0.1";
}

(commented out REMOTE_ADDR and replaced it with 127.0.0.1)

oh yes! thanks for reminding me

for reference again, this is around line 80 in register.php:

// Check that someone from this IP didn't register a user within the last hour (DoS prevention)
    $result = $db->query('SELECT 1 FROM '.$db->prefix.'users WHERE registration_ip=\''.get_remote_address().'\' AND registered>'.(time() - 3600)) or error('Unable to fetch user info', __FILE__, __LINE__, $db->error());

...I guess you alter the number of seconds (3600) here

You can alternatively cron a sql query to clean the ips from your database.
You will always have the ips since the last clean up on your database. I guess that's not as clean as you want your database to be, but it keeps your punbb instalation as it is.