Dear SIG members

A new version of the proposal "prop-132: AS0 for Bogons"
has been sent to the Policy SIG for review.

Information about earlier versions is available from:

You are encouraged to express your views on the proposal:

  - Do you support or oppose the proposal?
  - Is there anything in the proposal that is not clear?
  - What changes could be made to this proposal to make it more effective?

Please find the text of the proposal below.

Kind Regards,

Sumon, Bertrand, Ching-Heng
APNIC Policy SIG Chairs


prop-132-v002: AS0 for Bogons


Proposer: Aftab Siddiqui

1. Problem statement
Bogons are defined in RFC3871, A "Bogon" (plural: "bogons") is a packet
with an IP source address in an address block not yet allocated by IANA
or the Regional Internet Registries (ARIN, RIPE NCC, APNIC, AFRINIC and
LACNIC) as well as all addresses reserved for private or special use by
RFCs.  See [RFC3330] and [RFC1918].

As of now, there are 287 IPv4 bogons and 73 IPv6 bogons in the global
table. In the past, several attempts have been made to filter out such
through various methods such as static filters and updating them
but it is hard to keep an up to date filters, TeamCymru and CAIDA
provides full
bogon list in text format to update such filters. TeamCymru also
provides bogon
BGP feed where they send all the bogons via a BGP session which then can be
discarded automatically. Beside all these attempts the issue of Bogon
hasn't be resolved so far.

2. Objective of policy change
The purpose of creating AS0 (zero) ROAs for unallocated address space by
is to resolve the issue of Bogon announcement. When APNIC issues an AS0
ROA for
unallocated address space under APNIC’s administration then it will be
marked as
“Invalid” if someone tries to advertise the same address space.

Currently, in the absence of any ROA, these bogons are marked as
“NotFound”. Since
many operators have implemented ROV and either planning or already
discarding “Invalid”
then all the AS0 ROAs which APNIC will create for unallocated address
space will be
discarded as well.

3. Situation in other regions
No such policy in any region at the moment.

4. Proposed policy solution
APNIC will create AS0(zero) ROAs for all the unallocated address space
(IPv4 and IPv6)
for which APNIC is the current administrator. Any resource holder (APNIC
member) can
create AS0 (zero) ROAs for the resources they have under their

A ROA is a positive attestation that a prefix holder has authorised an
AS to originate a
route for this prefix whereas, a ROA for the same prefixes with AS0
(zero) origin shows
negative intent from the resource holder that they don't want to
advertise the prefix(es)
at this point but they are the rightful custodian.

Only APNIC has the authority to create ROAs for address space not yet
allocated to the members
and only APNIC can issue AS0 (zero) ROAs. Once they ROA is issued and
APNIC wants to allocate
the address space to its member, simply they can revoke the ROA and
delegate the address space
to members. (this proposal doesn't formulate operational process).

5. Advantages / Disadvantages
Those implementing ROV globally and discarding the invalids will be able
to discard bogons from
APNIC region automatically.

No apparent disadvantage

6. Impact on resource holders
No impact to APNIC or respective NIR resource holders not implementing
ROV. Those implementing ROV
and discarding the invalids will not see any bogons in their routing table.

7. References
RFC6483 -
RFC6491 -
RFC7607 -
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