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Power savings and trusting Linux firewall

 I have been on a power savings hunt. Besides trying to be more green, I 
have been checking stuff with a "Watts Up?" monitor and have been getting 
pretty pissed off at power usage. 

The biggest offenders are wall warts and power supplies. These things are 
always on and while a good number of them barely use anything, a lot more 
of them use crazy power. 

For reference, at my billing rate for electricity, a 1 watt drain that's 
left on 24/7/365 is about $1.50 a year. 

I added a switch bar for all my monitors and printers, which even if "off" 
still use power. 

I have been thinking about eliminating a separate Linux computer (119 
watts or  about $180 a year) with a second NIC in my regular computer and 
run all that stuff locally. The problem is that I like having a separate 
firewall system because I "feel" safer, and in fact I am provably safer, 
but am I $180 safer in real terms? 


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