(7) dns operation - SOI-Asia

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Important SOA Parameters (2/2) Serial number specifies whether zone transfer is necessary a popular cause of DNS trouble do not forget updating it when modifying a zone file "Minimum" TTL previously used for indicating the "default" TTL tend to be large (e.g., 1-2 days) RFC 2308 update: TTL for negative caching recommended value: 10-30 minutes revisit your configuration stick to the RFC 2308 definition use "$TTL" for the default TTL
Notes on CNAME (1/2) Another major source of DNS troubles Note 1: avoid CNAME chain foo.example. CNAME bar.example. bar.example. CNAME baz.example. ... not prohibited, but troublesome loop-prone may affect lookup performance Note 2: do not use CNAME for NS/MX names kame.example. NS ns.kame.example. ns.kame.example. CNAME cname.kame.example. cname.kame.example. A 192.0.2.1
Page 1 and 2: Internet Operation (7) DNS Operatio
Page 3 and 4: Overview of this lecture Prerequisi
Page 5 and 6: A brief review of DNS (1/2) DNS (Do
Page 7 and 8: A brief review of DNS (2/2) Server-
Page 9 and 10: Resource Records (RRs) Entity of DN
Page 11 and 12: Major resource records (2/2) PTR (P
Page 13: Important SOA Parameters (1/2) e.g
Page 17 and 18: Sample of complete zone file "jinme
Page 19 and 20: IPv6 transport for DNS Use IPv6 to
Page 21 and 22: Introduction to DNS operation with
Page 23 and 24: Useful tools for DNS operation with
Page 25 and 26: Output example of dig ; DiG 9.4.0a
Page 27 and 28: DNS operational considerations Lame
Page 29 and 30: Detect lame delegation with dig 1.
Page 31 and 32: Number/location of nameservers How
Page 33 and 34: BIND configurations for separation
Page 35 and 36: Advanced topics Load-balanced opera
Page 37 and 38: Assignment 1: check on your ccTLD C
Page 39: Assignment 3 Provide feedback on to

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