Hi,

for most dedicated provider,if the server under ddos,
will they nullroute the ip ?
if yes,how long will they let the ip be back ?

because for shared hosting server,
there are alot site on the server with the ip,
if the ip is been nullrouted,
it is hard to change all the site to other ip quickly and let the sites be back,

do you have any experience or suggestion with it ?

thanx