[Beowulf] passwordless "rsh" login
Robert G. Brown
rgb at phy.duke.edu
Mon Jul 12 16:15:00 EDT 2004
On Fri, 9 Jul 2004, Trent Piepho wrote:
> On Fri, 9 Jul 2004, Robert G. Brown wrote:
> > this three or four times. Things wrong with rsh:
> > a) no security (as in "bleeding wound" in an open network)
> > b) no environment passing
> > c) no tunnelling/port forwarding
> > d) no intrinsic X11 support
> > e) archaic and easily spoofed/snooped authentication mechanism (see a))
> > f) terrible passwordless login control
> > g) more or less frozen, unsupported code
> For starting jobs on a cluster with a private network, only b and g really
> matter, and then not that much.
> > Things good about rsh:
> > h) relatively fast
> For passing data over gigabit ethernet, rsh/rcp vs ssh/scp is about four times
> faster, depending on the CPU.
...but, for most applications, this is fairly unimportant -- four times
a small number still being pretty small.
> > Things bad about ssh:
> > i) relatively slow
> > j) cannot select "no encryption" as option even on secure networks
> > k) evil tty disconnect "feature" that requires ~. escapes (nested yet)
> > to leave a job backgrounded from an ssh session.
> What is so annoying about these things is that they didn't used to be
> problems with ssh. They were "features" added intentionally. I cannot
> stand the "we know what's best for you" attitude.
Amen. I totally, overwhelmingly agree with you. Given that j is the
cause of i, having a no encryption feature would leave you with
relatively cheap host authentication (a good thing) and a fast
connection. k just makes me steam -- I can't see why they added this at
all, as it does nothing but annoy people AFAICT. Why prevent
disconnected/background tasks? Just pointless...
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Robert G. Brown http://www.phy.duke.edu/~rgb/
Duke University Dept. of Physics, Box 90305
Durham, N.C. 27708-0305
Phone: 1-919-660-2567 Fax: 919-660-2525 email:rgb at phy.duke.edu
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