Right On Time, Somewhere Post: 302589822

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The Lounge War Stories Right On Time, Somewhere Post 302589822 by Corona688 on Thursday 12th of January 2012 05:58:16 PM

01-12-2012

Registered User

Right On Time, Somewhere

Things like this are teaching me a greater appreciation for network time...

The huge gap between the speed of a satellite connection and its tiny bandwidth allowance means either being completely draconian or having to chide people to not abuse it all the time. We're somewhere inbetween, if a customer downloads too much they'll be slowed down temporarily, but not shut off; if the situation continues, we may phonecall and investigate.

We had a situation where a small community had massively overused their satellite connection pretty much collectively, going over not only our limits but our provider's limits, causing the entire satellite connection to be throttled. We needed to shut the connection down for a few hours before the satellite modem would let go.

We planned it, set a time, and warned our customers. How it worked was very simple -- two entries in root's crontab. At noon that day, the first one would run 'ifconfig eth1 down', taking the community offline but leaving me in communication with the server. At 5pm that day, it would run '/sbin/reboot'.

The server clock had drifted far more than I'd anticipated in the months since its last boot and clock-set, and the shutdown happened one hour early.

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LEARN ABOUT DEBIAN

predict-g1yyh

PREDICT-G1YYH(1)					      General Commands Manual						  PREDICT-G1YYH(1)

NAME

       predict-g1yyh - satellite tracking program

DESCRIPTION

       The  predict-g1yyh  program  is a variant on the predict satellite tracking program that includes patches from John Heaton, G1YYH, that add
       new functionality.  This man page documents only the features that differ between predict and predict-g1yyh.  See the predict man page  for
       information on the features of the program that are not described here!

       The  user  may  step  forwards/backwards  through the satellites in the Single-Sat display using the '+' and '-' keys, and may remove blank
       entries from the Selector page.

       MultiSat has been reformatted to display upcoming passes below the satellites in view. Using the 'i' and 'k' keys you  can  toggle  between
       distances in Imperial or Kilometres.  Using the 'l' and 'm' keys you can toggle between displaying the normal latitude/longitude or Maiden-
       head locators for the sub-satellite location.

       The SingleSat display allows use of the arrow keys to change the frequency up/down  and	to  move  to  the  next/previous  satellite  using
       left/right arrows.

       A  new  method  of selecting satellites is implemented.	Instead of pressing a character next to a satellite name, a scrolling menu is pro-
       vided.  This means that the program is now capable of handling a much larget list of satellites, currently a maximum of 250.

       Finally, the height of the terminal window containing predict can be increased dynamically if you want to  display  more  information  than
       will fit on an 80x24 terminal window!

SEE ALSO

       predict(1),

AUTHOR

       This manual page was written by Bdale Garbee <bdale@gag.com>, for the Debian GNU/Linux system (but may be used by others).

																  PREDICT-G1YYH(1)