Possible BGP hijack

Beginning at 2021-12-22 20:27:24 UTC, we detected a possible BGP hijack.

Prefix 187.17.237.0/24, is normally announced by AS28267 LANTEC COMUNICACAO MULTIMIDIA LTDA, BR.

But beginning at 2021-12-22 20:27:24, the same prefix (187.17.237.0/24) was also announced by ASN 271571.

This was detected by 110 BGPMon peers.

Expected
Start time: 2021-12-22 20:27:24 UTC
Expected prefix: 187.17.237.0/24
Expected ASN: 28267 (LANTEC COMUNICACAO MULTIMIDIA LTDA, BR)
Event Details
Detected advertisement: 187.17.237.0/24
Detected Origin ASN 271571 (JOINVILLE TELECOMUNICACOES EIRELI, BR)
Detected AS Path 18356 45458 45430 6762 4809 263998 271571 271571
Detected by number of BGPMon peers: 110

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