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Full Discussion: Tricky little problem, send signal to other machine without user
Top Forums Shell Programming and Scripting Tricky little problem, send signal to other machine without user Post 302478816 by Corona688 on Thursday 9th of December 2010 03:00:54 AM
Old 12-09-2010
Quote:
Originally Posted by declannalced
Hmmm, that's not a bad idea. But I'd like a fast response time. Would it be hard to make it check about once a second?
Once a second is a bit much. It's easy to say a server can handle one connection per second but that doesn't mean it completes them always within that one second. When the network works well, it might work fine, but TCP connections can take a highly variable amount of time to connect.

I'd try to build something that watches for UDP packets, but I don't know a common convenient commandline tool for that. netcat doesn't deal with packets in a way that lets you see them, and tries way too hard to be telnet...
 

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LEARN ABOUT FREEBSD

wake

WAKE(8) 						    BSD System Manager's Manual 						   WAKE(8)

NAME

     wake -- send Wake on LAN frames to hosts on a local Ethernet network

SYNOPSIS

     wake [interface] lladdr [lladdr ...]

DESCRIPTION

     The wake program is used to send Wake on LAN (WoL) frames over a local Ethernet network to one or more hosts using their link layer (hard-
     ware) addresses.  WoL functionality is generally enabled in a machine's BIOS and can be used to power on machines from a remote system with-
     out having physical access to them.

     interface is an Ethernet interface of the local machine and is used to send the Wake on LAN frames over it.  If there is only one Ethernet
     device available that is up and running, then the interface argument can be omitted.  lladdr is the link layer address of the remote machine.
     This can be specified as the actual hardware address (six hexadecimal numbers separated by colons) or as a hostname entry in /etc/ethers.
     wake accepts multiple lladdr addresses.  Link layer addresses can be determined and set using ifconfig(8).

FILES

     /etc/ethers  Ethernet host name data base.

SEE ALSO

     ethers(5), ifconfig(8)

AUTHORS

     wake was written by Marc Balmer <marc@msys.ch>.

BSD
								 December 27, 2009							       BSD
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