So we got a HFBserver and the cluster we got put on gets ddos so BOOM 24 hour blackhole. Later we try again works for a week BOOM ddos with null route for 24 hours. We wait awhile and try again after the last patch BOOM 24 hour null route. I would avoid HFBservers unless you just enjoy getting your server shut down for 24 hours all the time cause some person on your IP cluster gets ddosed.
It is almost impossible to get a server going with HFB when they go down alll the time for 24 hours periods.