name-collision-02aug13-en

5.4.8 Name includes _sip, _sipinternal, _sipinternaltls,
_sipfederationtls, or _sips at the lowest level ................................................. 50
5.4.9 Name includes _xmpp-client, _xmpp-server, or _xmpconnect at
the lowest level ..................................................................................................................... 51
5.4.10 Name includes mail at the lowest level, and/or as the SLD ............................. 51
5.4.11 Name comprises just the proposed TLD ............................................................. 51
6 Name collision consequences ............................................................................................... 52
6.1 Name resolution ambiguity ............................................................................................ 52
6.1.1 Name lookup ambiguity .......................................................................................... 53
6.1.2 Instability on corporate networks............................................................................ 54
6.1.3 Non-query DNS traffic ........................................................................................... 55
6.1.4 Resolver search lists ................................................................................................ 55
6.1.5 DNSSEC ................................................................................................................. 56
6.2 Internal name certificates ............................................................................................... 57
6.2.1 Domain names and certificates ............................................................................... 58
6.2.2 Authentication based on certificates and domain names ........................................ 61
6.2.3 Certificates and name collision ............................................................................... 64
7 Name collision risks .............................................................................................................. 68
7.1 Name space instability ................................................................................................... 68
7.1.1 Instability issues for corp ..................................................................................... 68
7.1.2 Instability issues for home ..................................................................................... 69
7.1.3 Instability issues for all new TLDs ......................................................................... 70
7.2 Internal name certificates issued by widely-trusted CAs ............................................... 73
8 Name collision risk assessment ............................................................................................ 77
8.1 Probability of occurrence ............................................................................................... 77
8.2 Severity of consequences ............................................................................................... 78
8.3 Risk assessment framework ........................................................................................... 79
8.3.1 Low risk .................................................................................................................. 79
8.3.2 Non-customary risk ................................................................................................. 80
8.3.3 Calculated risk ........................................................................................................ 81
9 Name collision risk mitigation .............................................................................................. 84
9.1 Just say no ...................................................................................................................... 84
9.1.1 Advantages .............................................................................................................. 85
9.1.2 Disadvantages ......................................................................................................... 85
9.1.3 Residual risk............................................................................................................ 85
9.2 Further study .................................................................................................................. 85
9.2.1 Advantages .............................................................................................................. 85
9.2.2 Disadvantages ......................................................................................................... 85
9.2.3 Residual risk............................................................................................................ 86
9.3 Wait until everyone has left the room ............................................................................ 86
9.3.1 Advantages .............................................................................................................. 86
9.3.2 Disadvantages ......................................................................................................... 86
9.3.3 Residual risk............................................................................................................ 86
9.4 Look before you leap...................................................................................................... 87
9.4.1 Advantages .............................................................................................................. 87
9.4.2 Disadvantages ......................................................................................................... 87
Name Collision Study Report Page 6
Version 1.5 2013.08.02