equal-cost multipath in 2.6.7

Linux Advanced Routing and Traffic Control

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I have question about multipath routing. I am running a 2.6.7 kernel (gentoo). 
I have  a route with three nexthops on the same interface. I see a
different nexthop being picked for different destination addresses.
All is fine.

Now if one of the nexthop goes down (arp entry times out and arp
request doesnt get a response), does it remove the nexthop from
contention and only use the remaining two from this point on ?  What
about the flows for which this nexthop was chosen in the recent past.
Would they move to a different nexthop ?

Can anyone please point me to  implementation details about how a
nexthop is chosen and what is the algorithm used in case of multipath
routes and how to fine-tune the behaviour.

Thanks.
Darshan.
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