Possible BGP hijack

Beginning at 2023-08-29 00:30:55 UTC, we detected a possible BGP hijack.

Prefix 2001:256:100::/48, is normally announced by AS24367 CNGI-HZH-IX-AS-AP CERNET2 IX at Zhejiang University, CN.

But beginning at 2023-08-29 00:30:55, the same prefix (2001:256:100::/48) was also announced by ASN 266970.

This was detected by 2 BGPMon peers.

Expected
Start time: 2023-08-29 00:30:55 UTC
Expected prefix: 2001:256:100::/48
Expected ASN: 24367 (CNGI-HZH-IX-AS-AP CERNET2 IX at Zhejiang University, CN)
Event Details
Detected advertisement: 2001:256:100::/48
Detected Origin ASN 266970 ()
Detected AS Path 203507 33891 4230 61678 266970
Detected by number of BGPMon peers: 2

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