On Monday, 12 בMarch 2007, Shlomi Fish wrote:
> Here at work, we would like to test our two-ports network card using a
> loopback self-test. What we want to do is to connect a cable between
> the two ports and transfer packets from one port to the other.
> However, if we say assign the first port the Interface of eth1 and the
> IP of $IP1, and the second one the interface of eth2 and the IP of
> $IP2, then when transferring packets from $IP1 to $IP2 the kernel will
> transfer them directly in memory instead of over the wire.
>
> So, is there any way to disable this kernel switching at the kernel
> level, so we can still use higher-level protocols such as TCP/IP?
First, terminology: s/switching/forwarding/
Either:
echo 0 > /proc/sys/net/ipv4/ip_forward
Or the equivalent:
sysctl -w net.ipv4.ip_forward=0
Now you can send/receive packets from all your network interfaces
but there's no routing for packets among them.
Bye,
--
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