ADC hub referrer

In my Denying distributed attacks post, I described that users can be redirected to hubs. What I didn’t describe was whether there was a way for another hub to see if a user has been redirected or not. That is, something similar to the HTML referrer.

At the time, neither ADC nor NMDC had this type of functionality. However, before the official ADC 1.0 specification, a hub referral field was added to the INF.

What this means is that if a hub redirects a user, the client will automagically tell the hub so, when it successfully connects.

(NMDC still do not have this functionality.)

[If you’re not a hub (but eg a HTTP server) that’s being targeted, yes, you will need to do some communicating to find out from which address the user came from.]

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