sending a message from the server to all machines on the network

vmniza · 06-09-2005, 03:18 AM

I want to send a message for eg., a message like " YOUR MACHINE WILL SHUTDOWN IN 5 MINUTES " from a server machine to all machines in the network. How is it possible ?

Simon Bridge · 06-09-2005, 03:35 AM

I seem to remember you can do this by sending to x.x.x.255 (the broadcast address - the x.x.x is your network IP) if the hosts have not blocked broadcast in the firewall.
[edit:] Just checked - http://www.linktionary.com/b/broadcast_address.html - yup, this is right. [/edit]

It will have occurred to you to write a script listing all the host IP's which will send a specified message to everyone on the list?

You can also set an email template which has everyone's IP's in the carbons line. (much like the script)

And, everyone can have a shared e-mail for the network.

intense · 06-09-2005, 03:39 AM

you can use the 'wall' command to send message to all users i think.
and I know that in windows you can do a net send to the network broadcast adress (ending with 255 like stated in the post above.

to send a message to all users on one machine:
as root type:

Code:

wall

press enter
type the message you want to send (it can be more than one line )
press enter again
press control+D

greetz