[Twisted-Python] Protection against flooding

Fabian Rothfuchs fabian.rothfuchs at googlemail.com
Tue Sep 20 11:11:23 EDT 2011

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 anotherŠ

A good help for that might be the TR-069 protocol specification, which deals
with HTTP connections from 1 server to millions (!) of clients:

From:  Don Schoeman <don at delphexonline.com>
Reply-To:  Twisted general discussion <twisted-python at twistedmatrix.com>
Date:  Tue, 20 Sep 2011 14:51:26 +0200
To:  Twisted general discussion <twisted-python at 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,
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