Netty is a non-blocking I/O client-server framework for the development of Java network applications

socket cache server layer Socket Server listen thread extends  ServerSocket

Socket listen accept connect identifier

Multiple Connection

inetd (internet service daemon) is a super-server daemon on many Unix systems that provides Internet services. For each configured service
https://en.wikipedia.org/wiki/Inetd
TCP Wrappers (also known as tcp_wrappers) is a host-based networking ACL system, used to filter network access to Internet Protocol servers
https://en.wikipedia.org/wiki/TCP_Wrappers
xinetd (Extended Internet Service Daemon) is an open-source super-server daemon which runs on many Unix-like systems and manages Internet-based connectivity
https://en.wikipedia.org/wiki/Xinetd

iptables是運行在使用者空間的應用軟體，通過控制Linux核心netfilter模組
https://en.wikipedia.org/wiki/Iptables
iptables is a command-line firewall utility
ipchains  firewall

Syslog Daemons, Message Formats and Protocols
syslog daemon is a server process that provides a message logging

getpeername() — Get the name of the peer connected to a socket
WSAASyncSelect getpeername getsockname
asynchronous Socket listen accept client connect identifier getpeername getsockname

ServerSocket" Compressing RMI Wrapper SSL
Remote Method Invocation java.rmi.server Interface RMIServerSocketFactory  Java Remote Messaging Protocol

Netty is a non-blocking I/O client-server framework for the development of Java network applications

 https://en.wikipedia.org/wiki/Netty_(software)