One thing about application adoption is that you don't want to have to force the network to change if you want mass adoption. Better to design the application around the existing network paradigms.
Frank -----Original Message----- From: The EDUCAUSE Wireless Issues Constituent Group Listserv [mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU] On Behalf Of Dan Brisson Sent: Wednesday, March 12, 2014 7:51 PM To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU Subject: Re: [WIRELESS-LAN] Apple TV display mirroring spectrum use in HD wifi Yah, or the router vendors will need to do some fancy inspection to watch for the initial TCP connection that gets made so it knows to let the UDP connection back in. Like for FTP and the other protocols that behave in a similar manner. -dan Dan Brisson Network Engineer University of Vermont (Ph) 802.656.8111 dbris...@uvm.edu On 3/12/14, 8:21 PM, Frank Bulk wrote: > Interesting. I wonder if Apple could address that NAT issue by sending the > traffic from the opposite direction, essentially punching a hole in the NAT > so that bi-directional communication could be established. > > Frank > > -----Original Message----- > From: The EDUCAUSE Wireless Issues Constituent Group Listserv > [mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU] On Behalf Of Dan Brisson > Sent: Wednesday, March 12, 2014 3:20 PM > To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU > Subject: Re: [WIRELESS-LAN] Apple TV display mirroring spectrum use in HD > wifi > > I can confirm that NAT does throw this for a loop. This morning I tried > connecting my iPhone 5S that was behind a NAT device to an AppleTV on > the other side. I could see the AppleTV in the AirPlay list, I could > select it but then it wouldn't complete the mirroring. It would just > default back to the "iPhone" option. I did a packet capture and found > that the AppleTV was trying to open up a UDP stream to my iPhone, > presumably for audio, and the NAT device was not letting the UDP packet > in. Apparently if the UDP stream doesn't get established, the devices > will just give up. > > -dan > > > Dan Brisson > Network Engineer > University of Vermont > (Ph) 802.656.8111 > dbris...@uvm.edu > > On 3/12/14, 4:14 PM, Julian Y Koh wrote: >> On Wed Mar 12 2014 15:11:34 CDT, Julian Y Koh <kohs...@northwestern.edu> > wrote: >>> I don't think that all AppleTV units have Bluetooth. I'm not exactly > sure which revs do or don't offhand unfortunately. >> Another thing is that I would imagine that both the iOS device and the > AppleTV need to be able to reach each other directly using unicast. So if > the AppleTV is behind a NAT device with respect to the iOS device, or if you > have somehow blocked unicast traffic between clients on your wireless > network, you might be able to do the discovery via Bluetooh but not actually > stream any traffic. >> > ********** > Participation and subscription information for this EDUCAUSE Constituent > Group discussion list can be found at http://www.educause.edu/groups/. > > ********** > Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/. ********** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/. ********** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/.
