Nginx: parmelink setting

I use nginx, when i set parmelink to “numeric”, the posts are all gone.

i have include the followings in the nginx conf file

if (-f $request_filename/index.html){
rewrite (.*) $1/index.html break;
}
if (-f $request_filename/index.php){
rewrite (.*) $1/index.php;
}
if (!-f $request_filename){
rewrite (.*) /index.php;
}

but it doesn’t work.

Please help! Thanks.

george