nginx: access.log ohne lokales Netz

map $remote_addr $log_ip {

    "127.0.0.1" 0;
    "~10...*" 0;
    "~192.168..*" 0;

    default 1;
}

server {

   […]

   access_log /var/log/nginx/access.log main if=$log_ip;

}