TCP in Linux

 

 


 

 

  1. TCP的属性包括：Target目标的IP和端口；Source来源的IP和端口；socket file handle。
  2. cat /proc/sys/net/ipv4/ip_local_port_range 可使用端口范围1024 6500，即63977. 理论65535个2^16。 
  3. vim /etc/sysctl.conf  ;  net.ipv4.ip_local_port_range = 60000 60009; save; sysctl -p /etc/sysctl.conf ;
  4. 系统打开的最大数：cat /proc/sys/fs/file-max
  5. 用户可以打开的最大文件数：cat /etc/security/limits.conf
  6. 单进程可以打开的最大文件数： cat /proc/sys/fs/nr_open
    echo 100 > /proc/sys/fs/nr_open
  7. 一个线程对一个TCP，采用IO多路复用后，一个线程可以对多个TCP；

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