linux下tcp超時(shí)如何設(shè)置？

oraclinux

各位

目前遇到這樣的問題

有一個(gè)socket方式寫的server 和client程序

在windows下  client連接server后 一旦斷開網(wǎng)先  該連接在netstat中看到在1分鐘內(nèi)就會(huì)回收掉

但在linux下  默認(rèn)沒有修改參數(shù)  rehat as3 as4  這種情況下  幾乎要半小時(shí)才回收掉

該超時(shí)參數(shù)如何設(shè)置

已做如下設(shè)置，但沒效果

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)


照這個(gè)也沒用  郁悶了

沒人知道？

oraclinux

問題解決

我現(xiàn)在設(shè)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;


起作用的其實(shí)是 net.ipv4.tcp_retries2

keepalive數(shù)值沒用  恢復(fù)到默認(rèn)效果一樣

chinasiyu_cu

這個(gè)是TCP協(xié)議的性質(zhì)決定的啊。。。
客戶端異常終止服務(wù)端不知打就會(huì)一直處在半打開狀態(tài)
只要server端不向client發(fā)送數(shù)據(jù)，server就永遠(yuǎn)也不知道斷開了