what do you mean to create/define a directly interface?
The 3 hosts are network connected and ssh pub key enabled. Every hosts can
see the other but they are not all on the same direct connected network .
More in detail:
grid01 and grid04 are in the same network
grid03 is on different network.
Although this difference the jobs on grid01 and grid03 run properly like
that on grid01 and grid04. But the jobs that include simultaneously grid03
and grid04 fail.