Connectivity issues and packet inspection

Joe Abley jabley at
Thu Jun 19 15:09:07 CEST 2008

On 19 Jun 2008, at 04:58, David Conrad wrote:

>> 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 continue to be surprised that comcast doesn't spray a liberal set of  
6to4 relay routers throughout their network, given their efforts  
elsewhere in making v6 work. (Allowing the well-known 6to4 relay  
router prefix to propagate doesn't sound wrong, incidentally; it's  
surely not providing so-numbered relays closer to their customers  
which is silly.)

Assuming they have some ciscos in the packet path, this could be done  
with less than 10 lines of config, it seems to me. I'm sure there are  
flaming hoops of lab approval and peer review to go through, but it  
seems to me like work that would pay for itself in reduced support  
costs fairly quickly.


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