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De-Bogonising New Address Blocks Report - 20080501

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Summary

IPv4

Anchor Prefix: 84.205.83.0/24      
Size of set: 71 ASes

Visibility estimation	66 (+- 2) out of 71 ASes (92 %)
Filtering ASes (3)	3549 11537 16150
Uncertain ASes (part of a filtering as-path segment)	4
Filtering segments (at least one filtering AS):	[ 3216 16150 ] [ 4608 1221 4637 ]

Visibility estimation	65 (+- 3) out of 71 ASes (91 %)
Filtering ASes (3)	3549 11537 16150
Uncertain ASes (part of a filtering as-path segment)	6
Filtering segments (at least one filtering AS):	[ 3216 16150 ] [ 42109 44505 41877 20771 9121 ]

Visibility estimation	67 (+- 0) out of 71 ASes (94 %)
Filtering ASes (3)	3549 11537 16150
Uncertain ASes (part of a filtering as-path segment)	1
Filtering segments (at least one filtering AS):	[ 3216 16150 ]

Visibility estimation	62 (+- 4) out of 71 ASes (87 %)
Filtering ASes (4)	2516 3549 11537 16150
Uncertain ASes (part of a filtering as-path segment)	9
Filtering segments (at least one filtering AS):	[ 3216 16150 ] [ 4608 1221 4637 ] [ 42109 44505 41877 20771 9121 ]

Visibility estimation	65 (+- 2) out of 71 ASes (91 %)
Filtering ASes (4)	2516 3549 11537 16150
Uncertain ASes (part of a filtering as-path segment)	4
Filtering segments (at least one filtering AS):	[ 3216 16150 ] [ 4608 1221 4637 ]

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 /21 286 1103 1221 1280 1299 1930 2118 2119 2497 2516 2857 2895 2914 3216 3257 3267 3356 3549 3741 4589 4608 4637 4777 5413 5430 6453 6461 6667 6695 6762 6881 6939 7018 7575 8331 8359 8402 8434 8631 8763 8881 9002 9121 11537 12859 12989 13237 14361 16150 20144 20483 20485 20562 20640 20771 20965 21202 25152 25232 26943 28895 28917 30132 30890 31323 31477 34102 39792 41877 42109 44505

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.