Autonomous Systems Lists

An Autonomous System (AS) is a group of IP networks and routers under the control of one organization that presents a common routing policy to the Internet. An AS list lets you define a mapping between Autonomous System Numbers (ASNs) and the IP subnet prefixes that belong to each AS. You can use these lists to:

• Filter or group flows by provider, partner, customer, or internal segment.
• Enrich reporting when standard public AS to prefix data is incomplete or too broad.
• Create focused dashboards and alerts limited to specific transit or peering partners.
• Support investigations by narrowing traffic analysis to selected ASNs.

The Flowmon appliance includes a default AS list based on publicly available data. The system updates the default list with every new Flowmon version.

Click New List to create an AS list. After you enter the Name, optional Description, and upload a text file that maps ASNs to IP subnet prefixes, you can attach the list to monitoring ports in Advanced Settings. The Usage column shows how many monitoring ports use the AS list and the detail view lists the individual monitoring ports. Click the pencil icon to edit the AS list metadata. To modify the list content, download the current AS list, edit it, and upload the modified file. Click the trash bin icon to delete an AS list. You can only delete an AS list if no monitoring ports use it. The default AS list cannot be deleted. Click Reload to refresh usage information for all AS lists.

Example

15169-1.0.0.0/24
56203-1.0.4.0/22
2519-1.0.16.0/23
2519-1.0.18.0/23
2519-1.0.20.0/23
2519-1.0.22.0/23
2519-1.0.24.0/23
2519-1.0.26.0/23
2519-1.0.28.0/22
14282-2804:84::/32
28634-2804:128::/33
28634-2804:128::/32
28264-2804:130::/32