Possible BGP hijack

Beginning at 2021-09-16 13:40:37, we detected a possible BGP hijack.

Prefix 158.234.0.0/16, Normally announced by AS2856 BT-UK-AS BTnet UK Regional network, GB

Starting at 2021-09-16 13:40:37, a more specific route (158.234.248.0/24) was announced by ASN 211124.

This was detected by 3 BGPMon peers.

Expected
Start time: 2021-09-16 13:40:37 UTC
Expected prefix: 158.234.0.0/16
Expected ASN: 2856 (BT-UK-AS BTnet UK Regional network, GB)
Event Details
Detected advertisement: 158.234.248.0/24
Detected Origin ASN 211124 (CGI-UK-AS, FR)
Detected AS Path 206626 174 39537 211124
Detected by number of BGPMon peers: 3

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