[Beowulf] Remote procedure call (error)
Robert G. Brown
rgb at phy.duke.edu
Wed Jan 28 00:47:47 EST 2004
On Tue, 27 Jan 2004, prakash borade wrote:
> have any body tried RPC programing on Linux
> i get
> rpc unknown protocol error
> i am trying to diaply the message on the remote host
To do rpm programming you probably need a bunch of stuff configured and
running that might or might not be turned off for security reasons.
Check, for example, to see if the portmapper is running. Also check
iptables and/or ipchains to see if they are running and if so if any
rules block access to the portmapper.
rpcinfo is also your friend:
rgb at lilith|T:3#rpcinfo -p lilith
program vers proto port
100000 2 tcp 111 portmapper
100000 2 udp 111 portmapper
100024 1 udp 32768 status
100024 1 tcp 32768 status
391002 2 tcp 32769 sgi_fam
As a general rule, I'd consider the portmapper and rpc stuff to be a
moderate security risk; lilith lives inside firewalls only. I have had
direct experience of systems cracked in the past through portmapper
bugs, which perhaps makes me a bit paranoid.
What exactly are you trying to do?
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Robert G. Brown http://www.phy.duke.edu/~rgb/
Duke University Dept. of Physics, Box 90305
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Phone: 1-919-660-2567 Fax: 919-660-2525 email:rgb at phy.duke.edu
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