failover strategies - failing open vs. failing closed.

Linux Advanced Routing and Traffic Control

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I'd like to setup a box with 2 NICs as a firewall which will also rate
limits outbound traffic.  What happens when/if that box hangs or is
rebooted?

I'd like a solution that when there is a failure, traffic can still go
through the box even though the firewall and rate limiting functions will no
longer be in effect.  

I believe that this is "failing closed" but have yet to find an intuitive
definition - "closed" to traffic going through or (the opposite of an "open"
circuit) a "closed" circuit which would allow traffic?

Kelly J. Jeglum
jeglum@xxxxxxxxxxx
W (414) 229-5431, C (414) 750-2376
LAN Manager Auxiliary Services
University of Wisconsin - Milwaukee 
UWM Union room 312
2200 E. Kenwood Blvd.
Milwaukee, WI  53211


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