On 7 Jan 2020, at 5:01 AM, Martijn Schmidt via NANOG <nanog@nanog.org> wrote:
Out of curiosity, since we aren't affected by this ourselves, I know of cases where Cogent has sub-allocated IP space to its customers but which those customers originate from their own ASN and then announce to multiple upstream providers.
So while the IP space is registered to Cogent and allocated to its customer, the AS-path might be something like ^174_456$ but it's entirely possible that ARIN would observe it as ^123_456$ instead. Are such IP address blocks affected by the suspension?
As noted earlier, ARIN has suspended service for all Cogent-registered IP address blocks - this is being done as a discrete IP block access list applied to relevant ARIN Whois services, so the routing of the blocks are immaterial - a customer using a suballocation of Cogent space could be affected but customers with their own IP blocks blocks that are simply being routed by Cogent are not affected. FYI, /John John Curran President and CEO American Registry for Internet Numbers