似乎没有调用ip规则(ip rule does not seem to be invoked)

似乎没有调用ip规则(ip rule does not seem to be invoked)

我在本地机器上有两个连接，一个是通过eth0（有一个静态IP，让它是10.10.10.10），另一个是通过ppp0（有一个dinamic IP，例如10.20.30.40）。 两者都可以访问互联网。 我还有一个远程服务器（让我们假设它有IP 1.2.3.4）我想从我的本地机器连接到这样的方式，使得源地址为10.10.10.10（eth0）的数据包应该通过eth0，而那些有10.20的数据包。 .30.40（ppp0）作为源地址应该通过ppp0。

初步我删除了主路由表的ip规则，以防止此规则处理数据包。

之后，我创建了两个路由表，一个用于eth0（名为ETH），另一个用于ppp0（名为PPP）。 然后我添加了这些表的路由，如下所示：

ip route add default dev ppp0 table PPP ip route add default dev eth0 table ETH

然后我添加了ip规则如下：

ip rule add from 10.10.10.10 lookup ETH ip rule add from 10.20.30.40 lookup PPP

它不起作用。 但是，当我使用ip rule add from all而不是指向特定的IP时，它可以工作（当然，在这种情况下，数据包只通过一个接口）。 所以，当我指定IP时，似乎没有调用ip规则。

这种奇怪行为可能是什么原因？

有没有人有想法？

I have two connections on my local machine, one is via eth0 (has a static IP, let it be 10.10.10.10), another is via ppp0 (has a dinamic IP, for example 10.20.30.40). Both have access to the Internet. I also have a remote server (let's assume it has IP 1.2.3.4) to which I want to connect from my local machine in such a way that packets having source address 10.10.10.10 (eth0) should go through eth0, while those having 10.20.30.40 (ppp0) as a source address should go through ppp0.

Preliminary I deleted ip rule for main route table in order to prevent packets being treated by this rule.

After that, I created two route tables, one for eth0 (named ETH) and another for ppp0 (named PPP). Then I added routes to these tables as follows:

ip route add default dev ppp0 table PPP ip route add default dev eth0 table ETH

Then I added ip rules as followings:

ip rule add from 10.10.10.10 lookup ETH ip rule add from 10.20.30.40 lookup PPP

And it doesn't work. However, when I use ip rule add from all instead of pointing to a specific IP it works (sure, packets go through only one interface in this case). So, it seems like ip rule is not invoked when I specify IP.

What could be a reason of such strange behavior?

Does anyone have ideas?

最满意答案

我找到了原因。 此问题的原因是一个程序（使用QT QTcpSocket :: bind（）编写），它使用适当的接口绑定套接字，但不绑定路由设置。 由于未知原因，它不能正确地做到这一点。 我尝试使用原生的linux套接字函数，现在它像发条一样运行。

I found the reason. The cause of this problem is a program (written with usage of QT QTcpSocket::bind()) that binds a socket with an appropriate interface, but not the routing settings. It does not do that properly for unknown reason. I tried using native linux socket functions and now it runs like clockwork.