In your Protocol, I would implement a specific Error that might be returned by the server in such burst situations. The clients should interpret that error in a way that lets them reconnect to the server after a randomly chosen interval. This way you immediately eliminate the burst without running into the situation where you might get another and another and anotherĀ
A good help for that might be the TR-069 protocol specification, which deals with HTTP connections from 1 server to millions (!) of clients: http://www.broadband-forum.org/technical/download/TR-069_Amendment-3.pdf From: Don Schoeman <d...@delphexonline.com> Reply-To: Twisted general discussion <twisted-python@twistedmatrix.com> Date: Tue, 20 Sep 2011 14:51:26 +0200 To: Twisted general discussion <twisted-python@twistedmatrix.com> Subject: [Twisted-Python] Protection against flooding Hi all, Before I start digging in the Twisted code, I'd just like to bump this off you in case the solution is obvious... I have a lot of clients having permanent connections to my TCP server. These clients are devices that will buffer data if it can't connect to the server. I can see a possible problem in the future if/when for whatever reason there is downtime on my server or the network and all these devices start connecting and transmitting their buffered data once the server is back up, potentially causing server flooding. What would be a good area to start looking into preventing something like this from happening? My first thoughts are to simply limit an X number of new connections per minute (or per X seconds) and to simply immediately drop new connections if it exceeds that limit. (I'd probably implement this on Protocol level). Over time the connections should theoretically normalise as the buffered data on the devices are also limited. Of course it would be better to not allow the connections from being established in the first place if the limits are exceeded (will be great for DDOS protection), but I have a feeling that might be difficult to achieve. Any thoughts/tips or even links to examples? Kind Regards, Don _______________________________________________ Twisted-Python mailing list Twisted-Python@twistedmatrix.com http://twistedmatrix.com/cgi-bin/mailman/listinfo/twisted-python
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