Disable teredo

Teredo is a network protocol used to establish secure communication between clients and servers and to facilitate connection between devices behind routers that use network address translation (NAT). If this protocol is disabled or blocked, manually or by software, it can have these harmful effects on the system.

Greg Ferro's post about how Microsoft Teredo is a suboptimal networking solution made me think it's time to update my old post on how to disable Teredo in Windows 7 and in Windows 8. For the record, I agree — I've had serious problems with it conflicting with my native IPv6 connectivity. 1. Open a command prompt with administrator privileges (Start->Accessories->right click on Command How to Enable or Disable IPv6 in Windows 7, Windows 8, and Windows 10 The Internet Protocol version 6 (IPv6) is a new suite of standard protocols for the network layer of the Internet. IPv6 is designed to solve many of the problems of the current version of the Internet Protocol suite (known as IPv4) with regard to address depletion, security, auto-configuration, extensibility, and so on. At command prompt, to disable IPv6 from all interfaces, type these commands. Then press enter - one command at a time. netsh interface teredo set state disabled netsh interface ipv6 6to4 set state state=disabled undoonstop=disabled netsh interface ipv6 isatap set state state=disabled How to Disable TCP/IPv6 Teredo Tunneling in Windows. Tags aix apple backup centos chef cloud dell ESXi google hardware hyper-v intel iOS iphone licensing linux Linux VM Performance Tuning microsoft pseuro-interface oracle linux performance Perl Puppet red hat red hat enterprise linux security solaris solarwinds ssd ssh SSL storage sysadmin tuneling field day tuning vCenter vCSA veeam

Specifies the state of Teredo. The acceptable values for this parameter are: Disabled: Disables the Teredo service. Client. Enables the Teredo client. Enterpriseclient. Skips the managed network detection. Server. Enables the Teredo server. Relay. Automatic. Default. The default state is client.

net.ipv6.conf.lo.disable_ipv6 = 1. 4. Save and close the file. 5. Reboot the machine. To re-enable IPv6, remove the above lines from /etc/sysctl.conf and reboot the machine. The caveats. To disable unused IPv6 transition protocols on a per-host basis on Windows 7 client using netsh, open an elevated command prompt and execute the following commands: netsh interface 6to4 set state disabled netsh interface teredo set state disabled netsh interface isatap set state disabled Set Teredo State - Enable - choose "Client" (If after doing all steps it fails, try choose Enterprise Client instead.) After that, Win+R , services.msc, look for "IP Helper" and restart services. Now , Win+R, cmd, input " netsh interface teredo show state" and you should be seeing something like this:

Even if you disable IPv6, you can't disable IPv6 on pfSense itself. These days, IPv6 is the main network protocol - and IPv4 is the "tolerated while time lasts" protocol. So, your DNS - the Resolver - will still resolve any URL to AAAA and A if they exist.