[Beowulf] running out of rsh ports

[Bruce Allen]

rsh typically uses ports in the 513-1023 range.  With a 640 node cluster 
we are running out of ports.  This leads to messages such as:
"rcmd: socket: All ports in use"

Are there any standard solutions to this other than 'use ssh'?  We already 
have net.ipv4.tcp_tw_recycle = 1 in /etc/sysctl.conf

Cheers,
 	Bruce
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