小编Hod*_*odB的帖子

Ubuntu 12.04

我试图更好地了解 TCP 在未收到目的地收到的确认时将尝试重新传输数据包的次数。阅读tcp 手册页后，似乎很明显这是由 sysctl tcp_retries1 控制的：

tcp_retries1 (integer; default: 3)
           The number of times TCP will attempt to retransmit a  packet  on
           an  established connection normally, without the extra effort of
           getting the network layers involved.  Once we exceed this number
           of retransmits, we first have the network layer update the route
           if possible before each new retransmit.  The default is the  RFC
           specified minimum of 3.

我的系统设置为默认值 3：

# cat /proc/sys/net/ipv4/tcp_retries1 
3

为了对此进行测试，我通过 ssh …