Possible BGP hijack

Beginning at 2020-09-29 17:46:06 UTC, we detected a possible BGP hijack.

Prefix 156.11.128.0/18, is normally announced by AS397433 GWL-CA-ASN, CA.

But beginning at 2020-09-29 17:46:06, the same prefix (156.11.128.0/18) was also announced by ASN 1221.

This was detected by 24 BGPMon peers.

Expected
Start time: 2020-09-29 17:46:06 UTC
Expected prefix: 156.11.128.0/18
Expected ASN: 397433 (GWL-CA-ASN, CA)
Event Details
Detected advertisement: 156.11.128.0/18
Detected Origin ASN 1221 (ASN-TELSTRA Telstra Corporation Ltd, AU)
Detected AS Path 18356 9931 4651 7473 10026 1221
Detected by number of BGPMon peers: 24

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