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How do black holes mitigate ddos attacks?

I'm looking at how to try and prevent DDOS attacks before
I launch a website as I will expect lots of online 'booters' to attack the
server.



I've read through lots of threads on
here and stackoverflow and realised that at my own server its not worth setting anything
up as the damage is already being done.



This
means I can either have a reverse proxy or try and work with my hosting
provider.



What i'm trying to understand is how
null routing traffic is effective.



Lets say that
I have been able to identify the pattern of an attack and know which packets are from
the attack, If I tell my hosting provider this and they decide to black hole these
packets, isn't this still impacting their
infrastructure?




Because the bandwidth
is still be used in order for the attacker to send the packet in the first place, they
can keep sending them regardless of receiving no response so all the hosting provider is
doing is keeping my service up but still taking the
damage?



Is this meant to make the attacker give
up on the attack since the intended targets service is still
up?



And finally, is the only actual solution to
ddosing by having more bandwidth than the attacker?

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