性能优化基础:深入理解Linux网络 同CPU、内存以及 I/O 一样,网络也是 Linux 系统最核心的功能。网络是一种把不同计算机或网络设备连接到一起的技术,它本质上是一种进程间通信方式,特别是跨系统的进程间通信,必须要通过网络才能进行。 网络模型 多台服务器通过网卡、交换机、路由器等网络设备连接到一起,构成了相互...
而Send-Q 表示还没有被远端主机确认的字节数(即发送队列长度)。 当套接字处于监听状态(Listening)时, Recv-Q 表示全连接队列的长度。 而Send-Q 表示全连接队列的最大长度。 所谓全连接,是指服务器收到了客户端的 ACK,完成了 TCP 三次握手,然后就会把这个连接挪到全连接队列中。这些全连接中的套接字,还需...
• Send-Q 表示还没有被远端主机确认的字节数(即发送队列长度)。 当套接字处于监听状态(Listening)时, • Recv-Q 表示全连接队列的长度。 • Send-Q 表示全连接队列的最大长度。 所谓全连接,是指服务器收到了客户端的 ACK,完成了 TCP 三次握手,然后就会把这个连接挪到全连接队列中。 这些全连接中的...
/* Obtain a reference to a local port for the given sock,* if snum is zero it means select any available local port.* We try to allocate an odd port (and leave even ports for connect())*/intinet_csk_get_port(structsock*sk,unsignedshortsnum){boolreuse=sk->sk_reuse&&sk->sk_state!
()returnTrue# 检测到所有待检测端口的建联状态defcheck_ports(ip,ports):results={}forportinports:results[port]=is_port_listening(ip,port)returnresults# get the Host IP addressdefget_host_ip():try:# Get the hostnamehostname=socket.gethostname()# Get the IP addressip=socket.gethostbyname(...
To get a list of all listening ports withssyou would type: sudo ss -tunlpCopy The output is almost the same as the one reported bynetstat: State Recv-Q Send-Q Local Address:Port Peer Address:Port LISTEN 0 128 0.0.0.0:22 0.0.0.0:* users:(("sshd",pid=445,fd=3)) ...
I noticed that the listening ports were configured for 8123/8124 in the Tomcat server.xml file, yet I have been accessing DPA on port 80. I didn't think anything of this, assuming this was normal behavior through some DPA configuration / port redirection. But, I wanted t...
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tcpdump:verboseoutputsuppressed,use-vor-vvforfullprotocoldecodelisteningoneth0,link-typeEN10MB(Ethernet),capturesize262144bytes10:00:00.000000IPmyhost.local>192.168.1.1:ICMPechorequest,id12345,seq1,length6410:00:00.000001IP192.168.1.1>myhost.local:ICMPechoreply,id12345,seq1,length64 ...
Using just the-lparameter tells ss to list all Linux’s listening ports, which are omitted by default, making it easier to check for listening ports in Linux. To take a deeper dive into the ss tool, read ourLearning to Use the ss Tool to its Full Potentialguide. This guide provides co...