ip route refresh

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Hi,
I've noted on different system that when an ip route changes, the kernel keeps 
the old one in a cache (I suppose) for a while. For example, if in 
you /etc/hosts you have an entry:
192.168.1.201 fluca fluca
and ping fluca it will try to connect to 192.168.1.201.
Now if you change the address and immediatly reping it, it will try again the 
old host for a while. After a minute the system should be able to use the new 
address. This also applies to routes.
Is there a way to force a cache-clear, thus modifications are immediatly 
visible?

Thanks,
Luca

-- 
Luca Ferrari,
fluca1978@xxxxxxxxxxx
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