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This article discusses the Firewall application requirements necessary for Toredo to coexist with those firewalls on a Windows operating system-based computer.
In order for client firewalls to coexist with Teredo, the firewalls must follow the guidelines listed below.
1. The client firewall must allow resolution of teredo.IPv6.microsoft.com.
2. The client firewall must exempt UDP IPv4 traffic to/ from remote UDP port 3544.
a. Port 3544 allows the client to communicate to the Teredo Server.
3. Client firewalls must support the following ICMPv6 error messages & discovery functions:
a. ICMPv6 Neighbor Solicitation / Neighbor Advertisement
1. The codes for these are 135 and 136
b. ICMPv6 Echo Request/ Reply
1. The codes for these are 128 and 129
c. Packet Too Big
1. The code for this is 2
d. Parameter Problem
1. The code for this is 4
e. Time Exceeded
1. The codes for this is 3
f. Destination Unreachable
1. The code for this is 1
g. Router Solicitation / Router Advertisement
1. Codes 133 and 134
Note: If the above ICMPv6 messages cannot be specifically allowed, then the exemption of all ICMPv6 messages should be enabled on the firewall
4. The client firewall should allow the system to send and receive UDP/IPv4 packets to UDP port 1900
a. Port 1900 allows UPnP discovery traffic to flow, and while is not necessary, will improve connectivity rates.
To troubleshoot if you are having a Teredo problem, please run the command from a command prompt:
netsh int teredo show state
Review the “State" field in the Teredo parameters using the command above and do the following:
· If the Teredo State is offline then follow steps 1, 2 and 3 above
· If the Teredo State is dormant or qualified, then do step 3 only
Note: Perform step 4 to achieve best performance.
For more information on Teredo please refer to the following article below
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