Many people on the #IETF wifi networks in Madrid are running into problems using @signalapp. My hypothesis is that the large number of users in a small number of IPv6 /64s is triggering some rate-limiting. Does #Signal have the ability to apply reputation and rate-limits on a /128 basis for specific /64s? (Clearly future IETFs should use /64-per-host as @abhayakara pointed out on the mailing list.)