classless in addr arpa delegation n.
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Classless in-addr.arpa delegation. Why . Many enterprises are joining the net Size frequently does not justify /24 prefix Desire to assign < /24 prefix Problem delegating in-addr.arpa authority because in-addr.arpa mechanism is octet-oriented. The problem.

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Presentation Transcript
slide2
Why
  • Many enterprises are joining the net
  • Size frequently does not justify /24 prefix
  • Desire to assign < /24 prefix
  • Problem delegating in-addr.arpa authority because in-addr.arpa mechanism is octet-oriented
the problem
The problem
  • Enterprise A has 192.0.2.0/27
  • Enterprise B has 192.0.2.32/28
  • Who maintains 2.0.192.in-addr.arpa?
approach 1
Approach 1
  • Have 2.0.192.in-addr.arpa maintained by central body (e.g. service provider)
    • Maintainer must be notified of every change
    • Delays in processing
    • Does not scale
cname
CNAME
  • CNAME can be used to ‘move’ objects in the DNS tree:www.foo.com CNAME server.isp.net
  • Can use CNAME to alias parts of in-addr tree
normal delegation
Normal delegation

$ORIGIN 2.0.192.in-addr.arpa.1 PTR pc1.other.domain.2 PTR pc2.other.domain....

approach 2
Approach 2

$ORIGIN 2.0.192.in-addr.arpa.0 CNAME 0.some.domain.1 CNAME 1.some.domain.2 CNAME 2.some.domain.…

32 CNAME 32.other.domain.33 CNAME 33.other.domain.

$ORIGIN some.domain.1 PTR pc1.some.domain.

moving ptr records to different zones
Moving PTR records to different zones
  • Can point CNAME records to other places in domain tree:
    • in-addr.arpa.some.domain
    • 0/27.2.0.192.in-addr.arpa
    • 0-27.2.0.192.in-addr.arpa
comments
Comments
  • Need to add (a lot of) CNAME records in 2.0.192.in-addr.arpaThis is normal
  • This is not hard, it is confusing
    • domain names may be confusing
documentation
Documentation
  • See RFC2317 for documentation(it’s not a tutorial, however)
  • See ‘DNS and BIND’ page 214 onwards