Hi Everyone, worldwide, there are a lot of IP prefixes which are not advertised by the owner AS. Instead, another AS announces the prefix on behalf of the owner. For example: Amazon allows you to announce your prefix via AWS. For other people, this can lead to misassumptions (assuming a wrong IP owner). https://aws.amazon.com/about-aws/whats-new/2018/10/announcing-the-general-av... Another example would be a multi ASN company which announces all prefixes from a single ASN via BGP, even though the prefixes are assigned to various AS numbers. Since the RIRs do have the information, to which AS a specific prefix is assigned to, i would like to ask for more transparency. I would appreciate, if we could see more details here, and even more important: filter for such criterias when creating a new measurement. Anyone else here, who thinks that's useful? BR, Simon
Hi, On Wed, Jun 29, 2022 at 10:30:22AM +0200, Simon Brandt via ripe-atlas wrote:
Another example would be a multi ASN company which announces all prefixes from a single ASN via BGP, even though the prefixes are assigned to various AS numbers. Since the RIRs do have the information, to which AS a specific prefix is assigned to,
prefixes are not assigned to "AS" numbers, ever. prefixes are assigned to entities, as are AS numbers. ROAs and/or route(6): objects are used to tie both together - and it's in the authority of the network (prefix) holder to state which AS is allowed and expected to announce a given prefix, not the RIR. Repeat: the RIR has no say in "which AS is tied a prefix". Gert Doering -- NetMaster -- have you enabled IPv6 on something today...? SpaceNet AG Vorstand: Sebastian v. Bomhard, Michael Emmer Joseph-Dollinger-Bogen 14 Aufsichtsratsvors.: A. Grundner-Culemann D-80807 Muenchen HRB: 136055 (AG Muenchen) Tel: +49 (0)89/32356-444 USt-IdNr.: DE813185279
Hi Gert, thanks for your clarification! But you still get my point, do you? If a prefix was assigned to an entity other than the one that is advertising the prefix, for example: 80.187.128.0/22 Announcing: Deutsche Telekom AG (AS3320) Assigned: T-Mobile Deutschland GmbH (AS44178) The information (original prefix receiver) is stored in the RIPE DB, right? It could be compared to what we see via BGP. I am aware that a single entity can have multiple AS numbers, but when different entities are "involved", more transparency would be great. Or am i missing something here? BR, Simon On 29.06.22 10:54, Gert Doering wrote:
Hi,
Another example would be a multi ASN company which announces all prefixes from a single ASN via BGP, even though the prefixes are assigned to various AS numbers. Since the RIRs do have the information, to which AS a specific prefix is assigned to,
On Wed, Jun 29, 2022 at 10:30:22AM +0200, Simon Brandt via ripe-atlas wrote: prefixes are not assigned to "AS" numbers, ever.
prefixes are assigned to entities, as are AS numbers.
ROAs and/or route(6): objects are used to tie both together - and it's in the authority of the network (prefix) holder to state which AS is allowed and expected to announce a given prefix, not the RIR.
Repeat: the RIR has no say in "which AS is tied a prefix".
Gert Doering -- NetMaster
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