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Cisco Bug: CSCvs28332 - IPv6 tunnel connection fails (macOS; custom IPv6 default gateway on client machine)

Last Modified

Jan 31, 2020

Products (1)

  • Cisco AnyConnect Secure Mobility Client

Known Affected Releases

4.7(0) 4.8(0)

Description (partial)

AnyConnect fails to establish VPN: The VPN client was unable to successfully verify the IP forwarding table modifications. A VPN connection will not be established.

1) AnyConnect 4.7 or 4.8 running on MacOS Mojave or Catalina.
2) Manual IPv6 configuration of the macOS machine with a custom non-discovered IPv6 default gateway (either not on local link or not sending router advertisements per router discovery protocol).
3) Connection to the secure gateway via IPv6
IPv6 split-exclude tunneling enabled without localLAN (::/128) exclusion.
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