GlobalProtect IPv6 on tunnel adapter

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GlobalProtect IPv6 on tunnel adapter

L4 Transporter

Hi Community,

 

since the Covid situation, we went in a fast rollout regarding GlobalProtect and got a prelogon always on setup running - so far so good. As we enabled the users, wo work from home, we experienced lot's of issues regarding name resolution, since IPv6 an LLMNR interferes with the classical IPv4 DNS way.

As a result, we deployed a script, which disables IPv6 on all interfaces, so communication outside of the defined IPv4 way is not possible.

 

On a regular security audit, our pentest guy noticed, that IPv6 was enabled on the globalprotect tunnel adapter, but nobody enabled it and we even got logs from our custom script, that all of the IPv6 communication were successfully disabled.

 

Now the big question is - what software component enabled IPv6 again?

Maybe anyone has an idea, which logs/locations to check.

The script disables IPv6 on the interfaces with powershell "Disable-NetAdapterBinden -name <> -ComponentID ms_tcpip6". That survives a reboot as well.

Maybe that's even related to Windows updates or with GlobalProtect tunnel adapters expected behavior?

 

GlobalProtect latest 5.2 release, Windows 10 latest stable release

 

Looking forward to your ideas - many thanks

Best Regards
Chacko
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