CDN Overload
Long story short, it looks like some CDNs are using a modified version of TCP (sometimes called FastTCP) to force content down the throats of end-users more aggressively than standard TCP would dictate. This results in a terrible experience for the end-user.
What CDN? *
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What have you identified the traffic to be? *
What is the access network? *
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Where is the rate limiting done? *
How is the rate limiting done? *
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What is doing the rate limiting? *
What is the rate-limit set to? *
Upstream of the rate-limiter, what are you seeing for inbound traffic levels? *
One concurrent connection or many? *
How does other traffic behave when exceeding the rate limit (outside of the problem situations)? *
Where is NAT performed? *
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What is doing NAT (make\model)? *
Shared NAT or isolated to that customer? *
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Have you done a packet capture before and after the rate limiter? The NAT device? *
Are there any bursting methods in use (customer can download at a rate above their normal plan for some time, dropping down to their plan speed when done)? *
Would you be willing to send a filtered packet capture (only the frames that relate to this CDN) to the CDN if they want it? *
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