Bind 9 Administrator Reference Manual

6.3. Zone File ...................................................................................................................................89
6.3.1. Types of Resource Records and When to Use Them ...................................................89
6.3.1.1. Resource Records.............................................................................................89
6.3.1.2. Textual expression of RRs ...............................................................................92
6.3.2. Discussion of MX Records...........................................................................................93
6.3.3. Setting TTLs.................................................................................................................94
6.3.4. Inverse Mapping in IPv4 ..............................................................................................95
6.3.5. Other Zone File Directives ...........................................................................................95
6.3.5.1. The $ORIGIN Directive .................................................................................95
6.3.5.2. The $INCLUDE Directive..............................................................................96
6.3.5.3. The $TTL Directive.........................................................................................96
6.3.6. BIND Master File Extension: the $GENERATE Directive ........................................96
7. BIND 9 Security Considerations ........................................................................................................99
7.1. Access Control Lists .................................................................................................................99
7.2. chroot and setuid (for UNIX servers)......................................................................................99
7.2.1. The chroot Environment ............................................................................................100
7.2.2. Using the setuid Function ..........................................................................................100
7.3. Dynamic Update Security .......................................................................................................100
8. Troubleshooting .................................................................................................................................103
8.1. Common Problems..................................................................................................................103
8.1.1. It’s not working; how can I figure out what’s wrong?................................................103
8.2. Incrementing and Changing the Serial Number......................................................................103
8.3. Where Can I Get Help?...........................................................................................................103
A. Appendices.........................................................................................................................................105
A.1. Acknowledgements................................................................................................................105
A.1.1. A Brief History of the DNS and BIND .....................................................................105
A.2. Historical DNS Information...................................................................................................106
A.2.1. Classes of Resource Records.....................................................................................106
A.2.1.1. HS = hesiod...................................................................................................106
A.2.1.2. CH = chaos....................................................................................................106
A.3. General DNS Reference Information.....................................................................................106
A.3.1. IPv6 addresses (A6)...................................................................................................106
A.4. Bibliography (and Suggested Reading)..................................................................................108
A.4.1. Request for Comments (RFCs)..................................................................................108
Bibliography ...............................................................................................................108
A.4.2. Internet Drafts............................................................................................................111
A.4.3. Other Documents About BIND .................................................................................111
Bibliography ...............................................................................................................111
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