Administrators changed our cluster network topology, and now it has narrowly-scoped netmasks for internal and outside part of the cluster. Of course my soft stopped working giving an error during MPI_Init, then I checked in the FAQ:

How does Open MPI know which TCP addresses are routable to each other?

These rules do not cover the following cases:

So, it seems they changed network topology to unsupported configuration here... is there any walk-around of this situation?

          greetings, Marcin