How to configure a firewall when memcached and webserver run on the same server

Memcached and webserver run on the same server. how do I configure the firewall memcached and web server to run on the same server? how do I configure the firewall to prevent the Internet from telnet to memcached,

You can access memcached through telnet without a password. Generally, how does one solve security problems.

Reply to discussion (solution)

Memcached can use the intranet IP address.
Use-l for startup parameters When the binding address is set to 127.0.0.1, only local access is allowed.

Example: memcached-d-m 256-c 2048-p 11211-u www-l 127.0.0.1

Yes, you can use an intranet IP address when starting the firewall. unless you want to share data with other servers, you can add the IP addresses of other servers to the firewall whitelist.