Possible BGP hijack

Beginning at 2021-03-01 20:33:03 UTC, we detected a possible BGP hijack.

Prefix 2001:420:1100::/41, is normally announced by AS109 CISCOSYSTEMS, US.

But beginning at 2021-03-01 20:33:03, the same prefix (2001:420:1100::/41) was also announced by ASN 269684.

This was detected by 4 BGPMon peers.

Expected
Start time: 2021-03-01 20:33:03 UTC
Expected prefix: 2001:420:1100::/41
Expected ASN: 109 (CISCOSYSTEMS, US)
Event Details
Detected advertisement: 2001:420:1100::/41
Detected Origin ASN 269684 (LANFIBRA TELECOMUNICACOES - EIRELI, BR)
Detected AS Path 52873 266539 269684
Detected by number of BGPMon peers: 4

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