On Mon, Jun 25, 2012 at 8:03 PM, William Herrin <bill@herrin.us> wrote:
Does SCTP operate on a list of IPv4 and IPv6 addresses received from the application when it asks for a connect, parallelizing its attempt to reach a live address? Or a DNS name which it resolves to find those addresses? Or does it accept only one address at a time for the initial connect, just like TCP?
Hi Douglas, Another gentleman clarified for me privately: sctp_connectx() is listed as a new function in the 12/2011 standard. It accepts and uses multiple addresses during the initial connect. Good progress since the last time I looked at SCTP. I assume the SCTP API does not gracefully fall back to TCP for stream-oriented connections and UDP for datagram oriented connections, yes? So if an app author wants to use this in the real world as it exists in 2012, he'll have to juggle timeouts in order to try TCP if SCTP doesn't promptly establish. And he'll have to juggle the two APIs anywhere he does something more complex than send() and recv(). Yes? Also, has there been improvement to the situation where an endpoint loses all of its IP addresses and wants to re-establish? Something like a notification to the app requesting a fresh list of addresses? Regards, Bill Herrin -- William D. Herrin ................ herrin@dirtside.com bill@herrin.us 3005 Crane Dr. ...................... Web: <http://bill.herrin.us/> Falls Church, VA 22042-3004