linux下tcp超时如何设置？

oraclinux

各位

目前遇到这样的问题

有一个socket方式写的server 和client程序

在windows下  client连接server后 一旦断开网先  该连接在netstat中看到在1分钟内就会回收掉

但在linux下  默认没有修改参数  rehat as3 as4  这种情况下  几乎要半小时才回收掉

该超时参数如何设置

已做如下设置，但没效果

echo "30">/proc/sys/net/ipv4/tcp_fin_timeout
echo "60">/proc/sys/net/ipv4/tcp_keepalive_time
echo "0">/proc/sys/net/ipv4/tcp_window_scaling
echo "0">/proc/sys/net/ipv4/tcp_sack
echo "0">/proc/sys/net/ipv4/tcp_timestamps

oraclinux

Use sysctl -A to get a list of available kernel variables
and grep this list for net.ipv4 settings (sysctl -A | grep net.ipv4).
There should exist the following variables:
- net.ipv4.tcp_keepalive_time - time of connection inactivity after which
                                the first keep alive request is sent
- net.ipv4.tcp_keepalive_probes - number of keep alive requests retransmitted
                                  before the connection is considered broken
- net.ipv4.tcp_keepalive_intvl - time interval between keep alive probes

You can manipulate with these settings using the following command:

sysctl -w net.ipv4.tcp_keepalive_time=60 net.ipv4.tcp_keepalive_probes=3 net.ipv4.tcp_keepalive_intvl=10

This sample command changes tcp keepalive timeout to 60 seconds with 3 probes,
10 seconds gap between each. With this, your application will detect dead tcp
connections after 90 seconds (60 + 10 + 10 + 10)


照这个也没用  郁闷了

没人知道？

oraclinux

问题解决

我现在设置如下

net.ipv4.tcp_keepalive_time=60
net.ipv4.tcp_keepalive_probes=3
net.ipv4.tcp_keepalive_intvl=10;
net.ipv4.tcp_fin_timeout=30;
net.ipv4.tcp_retries2=5;


起作用的其实是 net.ipv4.tcp_retries2

keepalive数值没用  恢复到默认效果一样

chinasiyu_cu

这个是TCP协议的性质决定的啊。。。
客户端异常终止服务端不知打就会一直处在半打开状态
只要server端不向client发送数据，server就永远也不知道断开了