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/usr/share/ion/configs/loopback-stcp/loopback.ionrc is in ion-doc 3.0.1~dfsg1-1.

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# ionrc configuration file for loopback test.
#	This uses stcp as the primary convergence layer.
#	command: % ionadmin loopback.ionrc
# 	This command should be run FIRST.
#
#	Ohio University, July 2009

# Initialization command (command 1). 
#	Set this node to be node 1 (as in ipn:1).
#	Use default sdr configuration (empty configuration file name "").
1 1 ""

# start ion node
s

# Add a contact.
# 	It will start at +1 seconds from now, ending +3600 seconds from now.
#	It will connect node 1 to itself
#	It will transmit 100000 bytes/second.
a contact  +1 +3600		1 1   100000

# Add a range. This is the physical distance between nodes.
#	It will start at +1 seconds from now, ending +3600 seconds from now.
#	It will connect node 1 to itself.
#	Data on the link is expected to take 1 second to reach the other
#	end (One Way Light Time).
a range    +1 +3600		1 1   1

# set this node to consume and produce a mean of 1000000 bytes/second.
m production 1000000
m consumption 1000000