Cannot access IPv6 sites

Hello,

I cannot reach IPv6 websites with Opera build 1848 (running on Windows 
7) - while Firefox 3.5.4 and Internet Explorer 8 on the same machine 
have no problem. I'm having this problem probably for some months.

One example website is http://www.python.org.

nslookup gives:

Name:    www.python.org
Addresses:  2001:888:2000:d::a2
          82.94.164.162

I did a network trace and it shows six packets of this kind:

[Opera]
2002:952c:8881::952c:8881 2001:888:2000:d::a2 TCP 51957 > 80 [SYN]

Interestingly the IPv6 address belongs not to my LAN adapter but to my 
"Tunnel adapter 6TO4 Adapter". None of these connection attempts is ever 
answered.

These are the first packets of the (successful) connection in Firefox 
and Internet Explorer:

[IE and FF]
<my IPv4 address> 82.94.164.162     TCP 51861 > http [SYN]
82.94.164.162     <my IPv4 address> TCP http > 51861 [SYN, ACK]
<my IPv4 address> 82.94.164.162     TCP 51861 > http [ACK]

So it seems that Internet Explorer and Firefox ignore the IPv6 address 
of www.python.org and use its IPv4 address to connect - while Opera uses 
my Tunnel adapter's IPv6 address to connect to www.python.org's IPv6 
address and fails.

How can I fix Opera's failing IPv6 connection attempt or how can I make 
Opera behave like FF and IE (meaning "use the IPv4 address")?


Thorsten

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