[epel]name=Extra Packages for Enterprise Linux 6 - $basearchbaseurl=http://mirrors.aliyun.com/epel/6/$basearch        http://mirrors.aliyuncs.com/epel/6/$basearch#mirrorlist=https://mirrors.fedoraproject.org/metalink?repo=epel-6&arch=$basearchfailovermethod=priorityenabled=1gpgcheck=0gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-6 [epel-debuginfo]name=Extra Packages for Enterprise Linux 6 - $basearch - Debugbaseurl=http://mirrors.aliyun.com/epel/6/$basearch/debug        http://mirrors.aliyuncs.com/epel/6/$basearch/debug#mirrorlist=https://mirrors.fedoraproject.org/metalink?repo=epel-debug-6&arch=$basearchfailovermethod=priorityenabled=0gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-6gpgcheck=0 [epel-source]name=Extra Packages for Enterprise Linux 6 - $basearch - Sourcebaseurl=http://mirrors.aliyun.com/epel/6/SRPMS        http://mirrors.aliyuncs.com/epel/6/SRPMS#mirrorlist=https://mirrors.fedoraproject.org/metalink?repo=epel-source-6&arch=$basearchfailovermethod=priorityenabled=0gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-6

# yum search all tcpLoaded plugins: security=========================================================== Matched: tcp ===========================================================tcping.x86_64 : Check of TCP connection to a given IP/Porttcputils.x86_64 : Utilities for TCP programming in shell-scriptstcp_wrappers.x86_64 : A security tool which acts as a wrapper for TCP daemonstcpick.x86_64 : A tcp stream sniffer, tracker and capturertcpreen.x86_64 : A TCP/IP re-engineering and monitoring programtcpreplay.x86_64 : Replay captured network traffictcptraceroute.x86_64 : A traceroute implementation using TCP packetsiperf.x86_64 : Measurement tool for TCP/UDP bandwidth performancenagios-plugins-tcp.x86_64 : Nagios Plugin - check_tcpnbd.x86_64 : Network Block Device user-space tools (TCP version)tcp_wrappers-devel.i686 : Development libraries and headers for tcp_wrapperstcp_wrappers-devel.x86_64 : Development libraries and headers for tcp_wrapperstcp_wrappers-libs.i686 : Libraries for tcp_wrapperstcp_wrappers-libs.x86_64 : Libraries for tcp_wrapperstcpcopy.x86_64 : An online request replication tooltcpdump.x86_64 : A network traffic monitoring tooltcpxtract.x86_64 : Tool for extracting files from network trafficvanessa_socket.i686 : Simplify TCP/IP socket operationsbalance.x86_64 : TCP load-balancing proxy server with round robin and failover mechanismsclean-network.x86_64 : An TCP/IP implementation for Cleanhaproxy.x86_64 : HAProxy is a TCP/HTTP reverse proxy for high availability environmentshping3.x86_64 : TCP/IP stack auditing and much moreiperf3.i686 : Measurement tool for TCP/UDP bandwidth performanceiperf3.x86_64 : Measurement tool for TCP/UDP bandwidth performanceiptraf-ng.x86_64 : A console-based network monitoring utilitync.x86_64 : Reads and writes data across network connections using TCP or UDPnet6.i686 : A TCP protocol abstraction for library C++net6.x86_64 : A TCP protocol abstraction for library C++nmap.x86_64 : Network exploration tool and security scannerpen.x86_64 : Load balancer for "simple" tcp based protocols such as http or smtpportreserve.x86_64 : TCP port reservation utilityredir.x86_64 : Redirect TCP connectionsser2net.x86_64 : Proxy that allows tcp connections to serial portsvanessa_socket.x86_64 : Simplify TCP/IP socket operationsvanessa_socket-pipe.x86_64 : Trivial TCP/IP pipe build using libvanessa_adtvtun.x86_64 : Virtual tunnel over TCP/IP networks2ping.noarch : Bi-directional ping utility3proxy.x86_64 : Tiny but very powerful proxyderrick.x86_64 : A Simple Network Stream Recorderdnstop.x86_64 : Displays information about DNS traffic on your networkipset.i686 : Manage Linux IP setsipset.x86_64 : Manage Linux IP setsiptraf.x86_64 : A console-based network monitoring utilitysnmpcheck.noarch : An utility to get information via SNMP protocolssocat.x86_64 : Bidirectional data relay between two data channels ('netcat++')syslog-ng.i686 : Next-generation syslog serversyslog-ng.x86_64 : Next-generation syslog servertsocks.i686 : Library for catching network connections, redirecting them on a SOCKS servertsocks.x86_64 : Library for catching network connections, redirecting them on a SOCKS servertypespeed.x86_64 : Test your typing speed and get your fingers' CPSudt.i686 : UDP based Data Transfer Protocoludt.x86_64 : UDP based Data Transfer Protocolunicornscan.x86_64 : Scalable, accurate, flexible and efficient network probing

# redir --laddr=0.0.0.0 --lport=1999 --caddr=172.16.3.150 --cport=1922postgres@digoal-> psql -h 127.0.0.1 -p 1999 -U postgres postgrespsql (9.4.1, server 9.5devel)WARNING: psql major version 9.4, server major version 9.5.         Some psql features might not work.Type "help" for help.

服务端开启一个监听# nc -l 1234客户端连接过去postgres@digoal-> nc 127.0.0.1 1234fhello服务端see it:fhello或者作为数据传输的管道。服务端[root@digoal ~]# nc -l 1234 >./file客户端postgres@digoal-> nc 127.0.0.1 1234 <./.bash_history