tcp keepalive - 协议不可用? [英] tcp keepalive - Protocol not available?

问题描述

我正在尝试设置 tcp keepalive 但这样做时我看到了错误

I'm trying to set tcp keepalive but in doing so I'm seeing the error

协议不可用"

int rc = setsockopt(s, SOL_SOCKET, TCP_KEEPIDLE, &keepalive_idle, sizeof(keepalive_idle));
if (rc < 0)
    printf("error setting keepalive_idle: %s\n", strerror(errno));

我能够打开keepalive，设置keepalive间隔和计数，但keepalive idle(即keepalive时间)会引发该错误，而且我从未看到使用wireshark和过滤器tcp传输/接收任何keepalive数据包.analysis.keep_alive 或使用 tcpdump

I'm able to turn on keepalive, set keepalive interval and count but keepalive idle which is keepalive time is throwing that error and I never see any keepalive packets being transmitted/received either with wireshark and the filter tcp.analysis.keep_alive or with tcpdump

sudo tcpdump -vv "tcp[tcpflags] == tcp-ack and less 1"

是否有需要加载的内核模块之类的?或者您不再能够覆盖全局 KEEPIDLE 时间.

Is there a kernel module that needs to be loaded or something? Or are you no longer able to override the global KEEPIDLE time.

顺便说一下

matt@devpc:~/ sysctl net.ipv4.tcp_keepalive_time net.ipv4.tcp_keepalive_probes net.ipv4.tcp_keepalive_intvl
net.ipv4.tcp_keepalive_time = 7200
net.ipv4.tcp_keepalive_probes = 9
net.ipv4.tcp_keepalive_intvl = 75

推荐答案

在我编写的应用程序中，以下工作:

In an application that I coded, the following works:

setsockopt(*sfd, SOL_SOCKET, SO_KEEPALIVE,(char *)&enable_keepalive, sizeof(enable_keepalive));
setsockopt(*sfd, IPPROTO_TCP, TCP_KEEPCNT, (char *)&num_keepalive_strobes, sizeof(num_keepalive_strobes));
setsockopt(*sfd, IPPROTO_TCP, TCP_KEEPIDLE, (char *)&keepalive_idle_time_secs, sizeof(keepalive_idle_time_secs));
setsockopt(*sfd, IPPROTO_TCP, TCP_KEEPINTVL, (char *)&keepalive_strobe_interval_secs, sizeof(keepalive_strobe_interval_secs));

尝试将 TCPKEEPIDLE 的 SOL_SOCKET 更改为 IPPROTO_TCP.

Try changing SOL_SOCKET to IPPROTO_TCP for TCPKEEPIDLE.

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