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From: David Findlay <david_j_findlay at yahoo.com.au>
Organization: Davsoft
To: general at lists.humbug.org.au
Subject: [H-GEN] Multiple machines hanging of telstra ADSL
Date: Mon, 1 Oct 2001 20:14:51 +1000
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[ Humbug *General* list - semi-serious discussions about Humbug and  ]
[ Unix-related topics.  Please observe the list's charter.           ]
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I'm setting up a new internet service provider running on Linux stuff, and 
I'm using a main Linux router machine, but also a backup router. It will be 
an arrangement where if the primary router gets and kernel oops or overheats, 
it will send a wake up message to the backup machine(running in wake on LAN 
mode) to wake it up, before shutting itself down. 

I've read somewhere that you can plug the Alcatel speed touch ADSL into a 
hub, and have multiple machines directly off it. I would need such an 
arrangement to allow me to have both machines sharing the modem. No two 
machines would ever use it at once, to achieve the swapover, on the shut down 
condition the first machine would disconnect from the adsl, then turn on the 
other machine, which would then start the ADSL. Because the backup would be 
running in ACPI power off mode, it could come up in a matter of seconds and 
connect. I know you can do this in Windows, but I just want to know if anyone 
has had any experience doing this in Linux? And can I send the signal to the 
other machine via the same hub or would I need a different link to send that 
signal.

I'll run some software on the backup machine that will automatically mirror 
all changes from the primary server around 2am every morning. It will also 
have software to make it instantly take over all IP addresses and DNS names 
of the other machine when required. I'm currently a trainee at this company, 
but it's so cool to get to work on all this stuff, and all this cool gear. 
:-) Thanks,

David

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