owlttb - Online in the Cloud

PROGRAM:

NAME

owlttb - one-way light time transmission delay simulator

SYNOPSIS

owlttb own_uplink_port# own_downlink_port# dest_uplink_IP_address dest_uplink_port#
dest_downlink_IP_address dest_downlink_port# owlt_sec. [-v]

DESCRIPTION

owlttb delays delivery of data between an NTTI and a NetAcquire box (or two, one for
uplink and one for downlink) by a specified length of time, simulating the signal
propagation delay imposed by distance between the nodes.

Its operation is configured by the command-line parameters, except that the delay interval
itself may be changed while the program is running. owlttb offers a command prompt (:),
and when a new value of one-way light time is entered at this prompt the new delay
interval takes effect immediately.

own_uplink_port# identifies the port on owlttb accepts the NTTI's TCP connection for
uplink traffic (i.e., data destined for the NetAcquire box).
own_downlink_port# identifies the port on owlttb accepts the NTTI's TCP connection for
downlink traffic (i.e., data issued by the NetAcquire box).
dest_uplink_IP_address is the IP address (a dotted string) identifying the NetAcquire box
to which owlttb will transmit uplink traffic.
dest_uplink_port# identifies the TCP port to which owlttb will connect in order to
transmit uplink traffic to NetAcquire.
dest_downlink_IP_address is the IP address (a dotted string) identifying the NetAcquire
box from which owlttb will receive downlink traffic.
dest_downlink_port# identifies the TCP port to which owlttb will connect in order to
receive downlink traffic from NetAcquire.
owlt specifies the number of seconds to wait before forwarding each received segment of
TCP traffic.

The optional -v ("verbose") parameter causes owlttb to print a message whenever it
receives, sends, or discards (due to absence of a connected downlink client) a segment of
TCP traffic.

owlttb is designed to run indefinitely. To terminate the program, just use control-C to
kill it or enter "q" at the prompt.

EXIT STATUS

"0" Nominal termination.
"1" Termination due to an error condition, as noted in printed messages.

EXAMPLES

Here is a sample owlttb command:

owlttb 2901 2902 137.7.8.19 10001 137.7.8.19 10002 75

This command indicates that owlttb will accept an uplink traffic connection on port 2901,
forwarding the received uplink traffic to port 10001 on the NetAcquire box at 137.7.8.19,
and it will accept a downlink traffic connection on port 2902, delivering over that
connection all downlink traffic that it receives from connecting to port 10002 on the
NetAcquire box at 137.7.8.19. 75 seconds of delay (simulating a distance of 75 light
seconds) will be imposed on this transmission activity.

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