Hi to everybody. I understand that udpcast guarantees the integrity of the transmitted data through FEC redundancy code model but how can one be assured , beside integrity, also of consistency of the transmitted data, defining consistency as the property the all the hosts being part of the multicast group have received the data? I mean, if my multicasting model is composed of N host and I schedule to send a different file every T minutes, how can I detect the condition of D hosts not reachable for a time >T (tahr result in data copied only on N-D hosts)? Should I check the 'health' of all my N hosts before to run udpcast using icmp? For the application I've in mind it's very important to know what has or hasn't been delivered to whom so, I would like to encourage everyone who has had a similar problem or has some idea how to cope with. Thanks a lot in advance for your suggestions. Regerds, Gianni