In which case, an obvious suggestion is: you might try putting the windows machine in the DMZ.QuoteWhile I don't know the full details of 6in4, I'm not sure how well it will work through the NAT firewall.
6in4 has no issue with NAT as long as the router knows what's going on and is able to pass the traffic without bothering it.
I guess that means it is a bind address. I found that omitting it on my Linux box did not affect functionality.Quoteyou might try putting your 112.xxx.xxx.xxx address in the localaddress= value. [guessing]
That'll make things worse, the 192.x is appropriate here.