11.1 Port usage

1. Syntax
   allownet -protocol protocol -port port number permission;
   protocol: tcp,udp can be specified, splitted by ,.
   port number: number and -1023 and 1024- , and * can be described, splitted by ,.
   permission: client or server splitted by , can be described
2. Meaning
   Allow permissions to be TCP/UDP server/client using port. Port number -1023 means, all unused ports under 1023. 1024- means all unused ports after 1024. * means all ports.
3. Note about udp server
   If you describe allownet -protocol udp -port xxx server; The domain also behave as client to port number over 1024.
4. Example

   domain httpd_t;
   # httpd_t can be server using port 80 and 443.
   allownet -protocol tcp -port 80,443 server;
   # httpd_t can use TCP/UDP 3306 service(MySQL) as client.
   allownet -protocol tcp,udp 3306 client;