any recommendable anti-ddos solution?

Hello, list.

These days our network has been suffering from various ddos attack(syn flooding, udp flooding...etc).
from time to time, ddos traffic is over 2G bps and this makes all network service including firewall and IPS go down..

So is there any recommendable commercial anti-ddos equipment or solution?
I have heard about the cisco guard & detector and many say that only this can fight against ddos attack. right?

But it seems that other anti ddos solution comes...
Please recommend commercial anti ddos solution for me.


Thanks in advance...

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