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Cisco Bug: CSCvh75689 - OSX: DNS times out with tunnel-all VPN and Umbrella resolvers unreachable

Last Modified

Aug 06, 2019

Products (1)

  • Cisco AnyConnect Secure Mobility Client

Known Affected Releases

4.5(3040) 4.5(4029)

Description (partial)

Symptom:
Unable to browse the webpages when connected to a full tunnel group as the DNS requests are going to open DNS servers(not reachable via tunnel) instead of DNS servers configured on the tunnel

Conditions:
1.Install Anyconnect VPN +  Umbrella
2.Connect to headend on blizzard/blizzard-legacy networks[headend is configured as Tunnel All ipv4 traffic and drop ipv6 traffic]
3.Umbrella protected state is Disabled due to VPN(Expected)
4. When we ping  or browse websites(ex:swisscom.com,bluewin.com) where opendns resolvers are not reachable(inside the tunnel), the DNS queries are going directly from client to opendnsservers(Unexpected) instead of dns servers configured on the headend
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Bug Details Include

  • Full Description (including symptoms, conditions and workarounds)
  • Status
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