so_keepalive=30m::10 will set the idle timeout (TCP_KEEPIDLE) to 30 minutes, leave the probe interval (TCP_KEEPINTVL) at its system default, and set the probes count (TCP_KEEPCNT) to 10 probes. 使用的场景 一般我们使用KeepAlive时会修改空闲时长,避免资源浪费,系统内核会为每一个TCP连接建...
19 tcp_probe_interval -rw-r--r-- 1 root root 0 Mar 26 18:19 tcp_probe_threshold -rw-r--r-- 1 root root 0 Mar 26 18:19 tcp_recovery -rw-r--r-- 1 root root 0 Mar 26 18:19 tcp_reflect_tos -rw-r--r-- 1 root root 0 Mar 26 18:19 tcp_reordering -rw-r--r-- 1 ...
#define ICSK_TIME_PROBE0 3 /* Zero window probe timer */ #define ICSK_TIME_EARLY_RETRANS 4 /* Early retransmit timer */ #define ICSK_TIME_LOSS_PROBE 5 /* Tail loss probe timer */ 上述5种定时器分别为:超时重传定时器、ACK延迟定时器、持续定时器、ER延迟定时器、PTO定时器。 另外还有保活...
自动执行测试的时间间隔frequency取值必须大于interval和probe-count取值的乘积。 操作步骤 配置TCP服务器。 执行命令system-view,进入系统视图。 执行命令nqa-server tcpconnect[vpn-instancevpn-instance-name]ip-addressport-number,配置NQA测试TCP测试例的TCP侦听地址和端口号。
自动执行测试的时间间隔frequency取值必须大于interval和probe-count取值的乘积。 操作步骤 配置TCP服务器。 执行命令system-view,进入系统视图。 执行命令nqa-server tcpconnect[vpn-instancevpn-instance-name]ip-addressport-number,配置NQA测试TCP测试例的TCP侦听地址和端口号。
为防止这种死锁情况的发生,发送方使用一个坚持定时器 (persist timer)来周期性地向接收方查询,以便发现窗口是否已增大。这些从发送方发出的报文段称为窗口探查(window probe)。 实验代码 下面通过Python socket实现一个快的发送端和慢的接收端,然后通过Wireshark抓包来看看窗口更新通知和窗口探查。
Reno maintains an estimate of thetimetosenda packetandreceive the corresponding ACK (the “round triptime,”orRTT),andwhilethe ACK stream is showing thatnopackets are being lost in transit, then Reno will increase the sending rate by one additional segmenteachRTT interval. ...
withIntervalInSeconds public abstract LoadBalancerTcpProbe.Update withIntervalInSeconds(int seconds) Specifies the interval between probes, in seconds. Parameters: seconds - number of seconds Returns: the next stage of the updateApplies to Azure SDK for Java Legacy...
withIntervalInSeconds public abstract LoadBalancerTcpProbe.Update withIntervalInSeconds(int seconds) Specifies the interval between probes, in seconds. Parameters: seconds - number of seconds Returns: the next stage of the updateApplies to Azure SDK for Java Latest...
其中,发出心跳包收不到ACK的超时时间称为keepaliveinterval,Windows系统中默认是1秒,可配置;收不到心跳包对应的ACK包的重发次数probe,Windows系统是固定的,是固定的10次,不可配置的。 所以TCPIP协议栈的心跳机制也能检测出网络异常,不过在默认配置下可能需要很久才能检测出来,除非网络异常出现在正在发送心跳包后等待对...