Re: Testing Dual Ethernet via Loopback

[Edgar Toernig]

Nick Popoff wrote:
>
> So what I'm wondering is if there is a way to force Linux to actually
> utilize its network hardware in sending these packets to itself?  In other
> words, a ping or file transfer from an IP assigned to eth0 to another IP
> assigned to eth1 should fail if I unplug the network cable connecting the
> two.  Any advice on this would be much appreciated.

I don't know if there's some knob for that.  What I'm always doing:
tcpdump on one interface and then a broadcast ping on the other one.

If you want to write a hardware test program maybe using raw ethernet
packets is the way to go.  These can be send directly to a specific
interface and don't require it to be IP-configured.  man 7 packet

Ciao, ET.
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