The solution was to use the "tcp", "sm" and "self" BTLs for the transport of MPI messages, with TCP restricting only the eth0 interface to communicate and using ob1 as p2p management layer:
mpirun --mca btl_tcp_if_include eth0 --mca pml ob1 --mca btl tcp,sm,self -np 1 --hostfile my_hosts ./manager 1 Thank you for your help!
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