disable short route via localhost on dual network interface

Dear all,

for performance test purposes i want to disable the short route via
localhost on a dual network interface

i have two 10G network devices eth0 ( 192.168.1.1) and eth1(
192.168.1.2) on a linux host.

if i try to send packets from eth0 to eth1 then the network stack route
these packets over localhost and i doesn't see any traffic over the
external links

Now my question is: How can i disable these local routing via the lo
local network device to see the traffic over the real external network
connection ?

Any ideas ?

Regards,

Andreas

Andreas Wassatsch wrote:
> Dear all,
>
> for performance test purposes i want to disable the short route via
> localhost on a dual network interface
>
> i have two 10G network devices eth0 ( 192.168.1.1) and eth1(
> 192.168.1.2) on a linux host.
>
> if i try to send packets from eth0 to eth1 then the network stack route
> these packets over localhost and i doesn't see any traffic over the
> external links
>
> Now my question is: How can i disable these local routing via the lo
> local network device to see the traffic over the real external network
> connection ?

You can't, really.

Why not connect a client machine and run a benchmark program from that ?
You'd need 2 client machines, with the 10G box routing between them.

As it stands, it won't route anything, since they're on the same subnet,
but I fail to see how this would be used in production anyway.


J.

Dear all,


with route i don't mean ip routing, its more like steer the linux
network driver to use the external link for these kind of connection
instead of the short "link" via the internal network stack.

at the moment i have unfortunately only one dual 10g adapter card in one
machine and a switch with also two 10g interfaces.

i want to test the possible troughput of these dual 10g pc interface.

surely i can use a "farm" of 1g clients to generate the test traffic for
the 10g interface packeticed via the switch, but i think it should be
there a option in the network driver to use the dual 10g card for these
artificial test



Jeroen Geilman wrote:
> Andreas Wassatsch wrote:
>> Dear all,
>>
>> for performance test purposes i want to disable the short route via
>> localhost on a dual network interface
>>
>> i have two 10G network devices eth0 ( 192.168.1.1) and eth1(
>> 192.168.1.2) on a linux host.
>>
>> if i try to send packets from eth0 to eth1 then the network stack route
>> these packets over localhost and i doesn't see any traffic over the
>> external links
>>
>> Now my question is: How can i disable these local routing via the lo
>> local network device to see the traffic over the real external network
>> connection ?
>
> You can't, really.
>
> Why not connect a client machine and run a benchmark program from that ?
> You'd need 2 client machines, with the 10G box routing between them.
>
> As it stands, it won't route anything, since they're on the same subnet,
> but I fail to see how this would be used in production anyway.
>
>
> J.