[bArray]

> A big problem with the PTP unicast mode is an almost infinite traffic amplification (useful for DDoS attacks). The server is basically a programmable packet generator. Never expose unicast PTP to internet. In SPTP that seems to be no longer the case (the server is stateless), but there is still the follow up message causing a 2:1 amplification. I think something like the NTP interleaved mode would be better.

Facebook has little concern for traffic amplification that doesn't affect them. I can't find a source article for it now, but there was a time when you could take down a website hosting an image by simply posting <URL>/?<RANDOM>. I believe Facebook's (many) cache servers would individually make requests to the server until they inevitably saturated the image host's connection. I remember people complaining and it falling on deaf ears.

[ysofunny]

but this is not about facebook, this discussion is about the protocol

given how this industry protocols work, is likely that other big corporations that run data centers are also part of the real protocol discussion, some of those will be corncerned about traffic amplification