mDNS packets

1. mDNS packets • Measured number of multicast DNS (mDNS) packets during weekdays at Columbia wireless networks

2. Number of mDNS packets by service types • Measured using mDNSNetMonitor during 2 minutes Service Type Total pkts Probe Goodbye BrowseQ BrowseA ResolveQ ResolveA _daap._tcp. 10596 5 2 330 1774 6183 2302 _afpovertcp._tcp. 540 6 2 42 473 0 17 _workstation._tcp. 342 46 7 0 103 0 186 _ipp._tcp. 292 51 2 11 94 2 132 _services._dns-sd. 225 0 0 0 225 0 0 _ssh._tcp. 166 3 1 5 8 70 79 _presence._tcp. 123 0 0 16 15 73 19 _bittorrent._tcp. 119 0 0 79 40 0 0 _dacp._tcp. 115 16 3 0 34 0 62 _cups._sub. 103 0 2 9 92 0 0 _ftp._tcp. 86 3 1 21 53 0 8 _raop._tcp. 64 0 0 41 0 23 0 _rfb._tcp. 37 3 2 1 21 0 10 _appletv-pair._tcp. 35 0 0 35 0 0 0 _appletv._tcp. 35 0 0 35 0 0 0

3. Service types • Service Types • iTunes music sharing: _daap._tcp. • Apple File Sharing: _afpovertcp._tcp. • Workgroup manager: _workstation._tcp. • Internet printing protocol: _ipp._tcp. • _services._dns-sd. • SSH: _ssh._tcp. • iChat AV: _presence._tcp. • _bittorrent._tcp. • iTunes Digital Audio Control Protocol: _dacp._tcp. • _cups._sub. • FTP: _ftp._tcp. • _raop._tcp. • _rfb._tcp. • _appletv-pair._tcp. • _appletv._tcp.

4. Ratio of mDNS packets • Ratio of mDNS packets

5. Error rate of mDNS packets • Error rate Pe = (# of transmitted packets - # of received packets) / (# of transmitted packets)

6. Retransmission rate of mDNS packets • Retransmission rate = (# of retransmitted packets / # of total packets)