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RFC 816: The time until the cache expires is controlled by the kernel...

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Comment by Tushar Thakker
Submitted on 1/2/2004
Related RFC: RFC 816
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The time until the cache expires is controlled by the kernel variable /proc/sys/net/ipv4/route/gc_interval and defaults to 60 seconds. The bigger this number, the longer it will take until failing routes are not being used again, but the shorter this time, the smaller the chances to find a connection in the cache, loosing time to look up the connection in the routing tables. So, we can set the timeout at a certain level so that we can detect the dead route fast with less overhead.