Hello, In addition to the previous remarks:
Imagine that you have a friend who calls you to check if you are still reachable, say every 15 minutes. And imagine that you don't need to answer! The periodic RAs are that friend. This is frankly excellent. They periodically simulate an incoming call, show me that the system is capable of delivering incoming calls. If there is a problem, I can move to another operator's subnet! And please note that RS/RA doesn't check the paging system nor the paging channels. The only true system check procedure is using the unsolicited multicast RAs. Multicast periodic RAs check the paging system, the paging channels, and also the traffic channels. If you have received a periodic RA, this means that the whole system is working smoothly. RS/RA does NOT check the paging system nor the paging channels. It is not a good test. cheers, pars PS: Why the cellular network would stop working normally? I don't know. Because of power cut? sabotage? DoS attack? For DoS attacks on paging channels please see the new Wise'06 paper: http://ipmon.sprint.com/publications/uploads/wise06_paging.pdf There are real measurement results. -------------------------------------------------------------------- IETF IPv6 working group mailing list ipv6@ietf.org Administrative Requests: https://www1.ietf.org/mailman/listinfo/ipv6 --------------------------------------------------------------------
