I have been trying for a few days now, but cant seem to be able to setup a passwordless login using rsh in Ubuntu 12.04 server 64bit.
Before shooting me down and telling me to use ssh, this is my reason: Im setting up a cluster, and its huge. I want to be able to connect to any machine from any machine. Its a safe isolated network. The cluster uses MPI, which worked fine with rsh on older Red Hat Linux. Its silly to make key pair for every machine on every machine just to use passwordless SSH, hence the question. Also, ssh is slightly slower.
I tried everything, editing the .rhosts file, hosts.allow, hosts.equiv, etc.
Nothing seems to work. Please help.