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Cisco Bug: CSCsz59273 - IPv6 6to4 tunnel stops working after being idle for a few hours

Last Modified

May 09, 2017

Products (27)

  • Cisco IOS
  • Cisco MCS 7816-I4 Unified Communications Manager Appliance
  • Cisco MCS 7825-H4
  • Cisco MCS 7835-H2
  • Cisco MCS 7845-H2
  • Cisco 7845I Media Convergence Server
  • Cisco MCS 7825-I4
  • Cisco MCS 7825-I3
  • Cisco Support Tools
  • Cisco MCS 7835-I2 Unified Communications Manager Appliance
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Known Affected Releases


Description (partial)

IPv6 ping over 6to4 tunnel failed after being idle for a few (4) hours. IPv6 ND entry is deleted and tunnel source is unset.

Configure 6to4 tunnel, ping tunnel's ipv6 address, ping works initially. After 4 hours, ping failed.
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