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