On Sat, Aug 18, 2018 at 01:39:50PM -0400, Robert P. J. Day wrote:
>
> (i'm sure this has been explained many times before, so a link
> covering this will almost certainly do just fine.)
>
> i want to loop one physical ethernet port into another, and just
> ping the daylights from one to the other for stress testing. my fedora
> laptop doesn't actually have two unused ethernet ports, so i just want
> to emulate this by slapping a couple startech USB/net adapters into
> two empty USB ports, setting this up, then doing it all over again
> monday morning on the actual target system, which does have multiple
> ethernet ports.
>
> so if someone can point me to the recipe, that would be great and
> you can stop reading.
>
> as far as my tentative solution goes, i assume i need to put at
> least one of the physical ports in a network namespace via "ip netns",
> then ping from the netns to the root namespace. or, going one step
> further, perhaps putting both interfaces into two new namespaces, and
> setting up forwarding.
Namespaces is a good solution. Something like this should work:
ip netns add namespace1
ip netns add namespace2
ip link set eth1 netns namespace1
ip link set eth2 netns namespace2
ip netns exec namespace1 \
ip addr add 10.42.42.42/24 dev eth1
ip netns exec namespace1 \
ip link set eth1 up
ip netns exec namespace2 \
ip addr add 10.42.42.24/24 dev eth2
ip netns exec namespace2 \
ip link set eth2 up
ip netns exec namespace1 \
ping 10.42.42.24
You might also want to consider iperf3 for stress testing, depending
on the sort of stress you need.
Andrew
