Connectivity issues and packet inspection

David Conrad drc at
Thu Jun 19 10:58:13 CEST 2008


On Jun 19, 2008, at 3:35 PM, Gert Doering wrote:
>> ...colleagues tell me that enabling IPv6 addresses within Vista  
>> causes
>> all sorts of sporadic and intermittent network connectivity problems
>> with their IPv4 communication...however, they are not really network
>> people, so it could be coincidence.
> That's mostly FUD.  Support folks don't understand IPv6, so everything
> is blamed there.  Even broken IPv4 servers...

Err, no.

I have disabled IPv6 on my home network because my service provider,  
Comcast (I'm one of 25 million customers), does not support IPv6, but  
does allow the 6to4 anycast address to propagate.  I got quite tired  
of going to sites that happened to have IPv6 enabled (like, oh say  
ICANN's and IANA's web sites) and having my traffic go from the SF Bay  
area to Los Angeles via Germany.  When it worked.

Given the state of IPv6 deployment today, I fully understand why ISP  
support desks tell their customers to turn off IPv6 as one of the  
first steps towards debugging network connectivity problems.


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