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please find below the details of my system.and outputs , these are the few things which i had done , but still , so please have look and waiting for some advice which can help me out from this problem.
[root@veritas ~]# /usr/bin/rsh 192.168.20.129
192.168.20.129: No route to host
... 'tcptraceroute 192.168.20.129 514' would have been more convenient because it shows the route that actual traffic takes between hosts, if the remote port is open and if you have ensured it is open if it's denied in /etc/hosts.deny and or the firewall.
cat /etc/hosts output
For Veritas Cluster Is is[sic] mandatory to have rlogin enabled or it can also work with passwordless ssh ????
not sure what a veritas cluster is (is it like beowolf ?) but if it is linux it probably has sshd turned on by default (which has nothing to do with rlogin).
what i know of rlogin was that it was a protocol used for logging in remotely to systems. then it was replaced by telnet which added the security of needing a password to login to remote systems. and then ssh replaced that by encrypting the channel and optionally replacing passwords with keys.