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Frederico A C Neves <fneves@lacnic.net>. Used for inverse resolution Sample reverse resolution 192.168.5.87 -> www.example.com 87.5.168.192.in-addr.arpa. IN PTR www.example.com. Sample direct resolution www.example.com -> 192.168.5.87 www.example.com. IN A 192.168.5.87

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Frederico A C Neves

<fneves@lacnic.net>

in addr arpa zone
Used for inverse resolution

Sample reverse resolution

192.168.5.87 -> www.example.com

87.5.168.192.in-addr.arpa. IN PTR www.example.com.

Sample direct resolution

www.example.com -> 192.168.5.87

www.example.com. IN A 192.168.5.87

Delegation schema of sub-zones limited by the 8 bits boundary format of representation

in-addr.arpa zone
delegation base on allocated prefix size
/16 or shorter

Multiples delegations at the 16th bit boundary

Sample 200.2/15

2 zones 2.200.in-addr.arpa and 3.200.in-addr.arpa

/17 to /24

Multiples delegations at the 24th bit boundary

Sample 200.35.0/20

16 zones from 0.35.200.in-addr.arpa to 15.35.200.in-addr.arpa

/25 or longer

Recommended the use of BCP20

Delegation base on allocated prefix size
lame delegation control
Motivated by the side effects caused by some resolver implementations that impose higher load at upper levels of the delegation (notably /8 delegated servers for .in-addr.arpa).

Already monitoring reverse lame delegations.

Proposal should be addressed by a new working group at the mailing list.

Volunteers ?

Possible questions for the mailing list

What is the criteria to classify a multi zone delegation as lame ?

What should be the procedure when classified ?

Lame delegation control