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De-Bogonising New Address Blocks Report - 20080422

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Summary

IPv4

Anchor Prefix: 84.205.83.0/24      
Size of set: 13 ASes

Visibility estimation	12 (+- 0) out of 13 ASes (92 %)
Filtering ASes (1)	11537
Uncertain ASes (part of a filtering as-path segment)	0

Visibility estimation	12 (+- 1) out of 13 ASes (92 %)
Filtering ASes (0)
Uncertain ASes (part of a filtering as-path segment)	2
Filtering segments (at least one filtering AS):	[ 11537 1103 ]

Visibility estimation	12 (+- 1) out of 13 ASes (92 %)
Filtering ASes (0)
Uncertain ASes (part of a filtering as-path segment)	2
Filtering segments (at least one filtering AS):	[ 11537 1103 ]

Visibility estimation	11 (+- 1) out of 13 ASes (84 %)
Filtering ASes (1)	2516
Uncertain ASes (part of a filtering as-path segment)	2
Filtering segments (at least one filtering AS):	[ 11537 1103 ]

Visibility estimation	11 (+- 1) out of 13 ASes (84 %)
Filtering ASes (1)	2516
Uncertain ASes (part of a filtering as-path segment)	2
Filtering segments (at least one filtering AS):	[ 11537 1103 ]

Details

IPv4 AS Number 41.223.236.0 /22 95.192.0.0 /16 95.255.248.0 /21 186.128.0.0 /16 186.127.248.0 /21 114.0.0.0 /24 114.50.0.0 /21 114.200.0.0 /19 114.255.0.0 /16 115.0.0.0 /24 115.50.0.0 /21 115.200.0.0 /19 115.255.0.0 /16 1103 1280 2497 2516 2914 4777 6461 6939 7575 11537 12859 14361 30132

Methodology

The anchor and debogon prefixes are announced by the same router (RRC3) and AS number (AS12654). The AS-path from any point on the Internet towards the announcing router should therefore be the same for both prefixes. If this is not the case, it is assumed that debogon prefix filtering is being applied somewhere on the path.

The collection points of the AS-paths used in this report are all the RIS RRCs. Therefore, ASes covered in this report are only those seen in the AS-paths between the collection points and the anchor prefix.

To perform this report, all the AS-paths towards the anchor and the debogon prefixes are compared:

• ASes appearing on matching anchor and debogon paths are labelled non-filtering.
• From the unmatching AS-paths, all ASes labeled as non-filtering are removed, generating a list of AS-path segments.
• If a segment consists of only one AS, the AS is labelled filtering.
• All remaining ASes are labelled uncertain.

If an AS is labelled uncertain, it means that it is part of an AS-path segment in which at least one AS is considered to be filtering, but it is unconclusive which one(s).

The visibility plots show the percentage of how many ASes are estimated to be non-filtering. The grey area represents the indeterminacy caused by the ASes considered uncertain.