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How to make a link backup?



Hello,

         Assuming I have two WAN link, with two different routes and ips. And I have two nics in my box.

         Usually, I only use one link, the primary link. But sometimes, the primary link is down, I need to switch to another link ASAP, and switch back when the broken link is OK again for a certain long time.

         How to do this? I do not think bonding works here, right?

 

Thanks.


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