Dilemme accessing WP from local lan

Hi There ,

I have a dilemma. If I set my wordpress URL to the actual resolveable url. ie: toyota.blogsite.org – which resolves to a static ip on our firewall – which in turns port porwards to the actual pc running WP – everything works 100% from outside the lan. But I cannot seem to access it at all from inside the lan. i tried setting the hosts file to resolve the url – to the local lan address of the wordpress server. But still no joy. And if I set the wordpress URL to the local lan IP – it works perfect from inside the lan – but not from outside. Any ideas ??

Thanks!
Zakaria