I've seen 3 Gbit/s attacks to minor sites for no apparent reason. I can't imagine what MTGox gets on a regular basis.
They say
reading enriches the imagination.
Very high spikes. While baseline remained for the entire duration in the 5-10 Gbit range, I've seen spikes as high as 100Gbit and I'm not even sure I've actually measured the highest ones.
Re, the UDP suggestion. That might not be a bad idea at first glance. It'd work if MTGox advertised the price from some mostly unknown IPs and out different routers, out to a list of subscribers. Another option would be to put this data in DNS, maybe in a TXT or SRV record with a TTL of 60. Then the DNS servers might be attacked, which could be a new problem.
You are rubbing sticks together trying to solve already solved problems.
The many ways available for talking to MPEx.
I guess there simply would not be be anything to broadcast during the times when the engine is down or when nobody can make any trades. It would broadcast only silence. Maybe it could broadcast "Help!!! Help!!! We're under attack!".
Of course the clueless knowitalls haven't yet answered the
At what level do you propose blocking the incoming traffic?