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Cisco Bug: CSCuw49658 - ASR9k drops teredo bubble packets with PARSE_DROP_IPV6_LENGTH reason

Last Modified

Jul 20, 2018

Products (8)

  • Cisco ASR 9000 Series Aggregation Services Routers
  • Cisco ASR 9922 Router
  • Cisco IOS XR Software
  • Cisco ASR 9010 Router
  • Cisco ASR 9904 Router
  • Cisco ASR 9006 Router
  • Cisco ASR 9001 Router
  • Cisco ASR 9912 Router

Known Affected Releases


Description (partial)

ASR9k drops null payload IPv6 packets with PARSE_DROP_IPV6_LENGTH reason.
A Teredo bubble is a minimal IPv6 packet, made of an IPv6 header and a null payload.  The payload type is set to 59, No Next Header, as per [RFC2460]. The Teredo clients and relays may send bubbles in order to create a mapping in a NAT

Teredo Bubble packetes on ingress
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