[ppml] Policy Proposal: Modification to Reverse Mapping Policy
info at arin.net
Wed Sep 12 11:06:36 EDT 2007
ARIN received the following policy proposal. In accordance with the ARIN
Internet Resource Policy Evaluation Process, the proposal is being
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Policy Proposal Name: Modification to Reverse Mapping Policy
Author: John Von Essen
Proposal Version: 1.0
Submission Date: September 11, 2007
Proposal type: modify
Policy term: permanent
I am proposing a modification to section 7 of the IPv4 policy such that
a more precise definition and overview of lameness is described.
Below is how I think section 7 should be re-written.
START NEW Section
7. Reverse Mapping
7.1. Maintaining IN-ADDRs
All ISPs receiving one or more distinct /16 CIDR blocks of IP addresses
from ARIN will be responsible for maintaining all IN- ADDR.ARPA domain
records for their respective customers. For blocks smaller than /16, and
for the segment of larger blocks which start or end with a CIDR prefix
longer than /16, ARIN can maintain IN-ADDRs through the use of the SWIP
(Reallocate and Reassign) templates or the Netmod template for /24 and
7.2.1 Lame Delegation
A delegation is defined as being lame if all of the in-addr.arpa zones
for a given name server of a specific network registration are lame. An
in- addr.arpa zone is defined as lame when ARIN requests the SOA record
from the name server registered in whois, but does not receive an answer.
7.2.2 Partially Lame Delegation
A delegation is defined as being partially lame if at least one in-
addr.arpa zone for a given name server of a specific network
registration is lame. An in- addr.arpa zone is defined as lame when ARIN
requests the SOA record from the name server registered in whois, but
does not receive an answer.
7.3. Handling of Lame and Partially Lame Delegations in IN-ADDR.ARPA
ARIN will actively identify lame and partially lame DNS name server
(s) for reverse address delegations associated with address blocks
allocated, assigned or administered by ARIN. Upon identification of a
lame or partially lame delegation, ARIN shall attempt to contact the POC
for that resource and resolve the issue. If, following due diligence,
ARIN is unable to resolve the lame or partially lame delegation, ARIN
will update the WHOIS database records resulting in the removal of lame
or partially lame DNS servers. ARIN's actions in resolving lame and
partially lame delegations is governed by the procedures set forth in
(Lame-Ref) "Lame Delegations In IN-ADDR.ARPA", http://www.arin.net/
STOP NEW Section
Current policy only considers an Org's delegation being deemed lame if
all of in-addr.arpa zones for a given name server of a specific network
registration are lame. Lame is defined when ARIN tests an in-addr.arpa
zone by requesting the SOA record from the name server registered in
whois, but does not receive an answer. If deemed lame, ARIN has an
appropriate procedure for contacting the Org and handling the issue as
per "http://www.arin.net/ reference/lame_delegations.html".
Unfortunately, the policy does not cover the situation of a so-called
partially lame delegation. That is, some of the in-addr.arpa zones
belonging to the network registration return a valid SOA upon testing,
and some do not. Even if only one /24 in-addr.arpa reverse tests comes
back as lame, it is my opinion that this still taints the reputation of
entire network registration. IPs belonging to that lame in-addr.arpa
zone will cause query timeouts to 3rd party dns resolvers, both public
and private. These excessive timeouts in my opinion can harm the overall
well-being of reverse dns functionality throughout the internet. The
only way to prevent such harm is for ARIN to not delegate reverse
authority to the so-called partially lame dns server as registered in
whois. That is the purpose of this policy proposal, to consider partial
lameness with the same prejudice as traditionally defined lameness.
Org's who are partially lame should be contacted by ARIN and lame
in-addr.arpa zones should be resolved as the procedures per
"http://www.arin.net/reference/ lame_delegations.html" dictate.
Timetable for implementation: June 1, 2008
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