gnuix server: configuration for permalink ?

I have include the followings in gunix setting. no .htaccess 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;
}
–

I switch permalinks to “numeric”, and the posts are all no show. (404)
It was alright if I change the permalnk back to default.

Something wrong with the setting?