Re: 6to4 connectivity test

[Brian E Carpenter <brian.e.carpenter@gmail.com>]

Roll back the clock and I'm sure you'll find email 20 years old saying
things like
"the blackholes are responding to ICMP just
fine.  They just don't forward IPv4 from some networks (not others)."

As Gert hinted, this is the tedious part of deploying a new
protocol, i.e. chasing down the connectivity gaps one
at a time. I doubt it's specific to 6to4, though maybe we need
an FAQ on running a 6to4 relay.

   Brian

On 2008-02-02 09:45, James Woodyatt wrote:
> As I wrote privately, the 6to4 blackholes are responding to ICMP just
> fine.  They just don't forward IPv6 from some networks (not others).
> 
> -jhw
> 
> On Feb 1, 2008, at 12:31, Antonio Querubin <tony@lava.net> wrote:
> 
>> On Fri, 1 Feb 2008, james woodyatt wrote:
>>
>>> Search the Apple discussion boards for IPv6, and you will see that a
>>> lot of people are turning off IPv6 entirely on their computers to
>>> work around the connectivity issues involved here.
>>
>> I've already mentioned in private email but will re-iterate here. 
>> This is a problem caused by the CPE (the Airport in this case) not
>> erring on the side of caution.  These devices really need to leave
>> 6to4 disabled and not allow autoconfiguration unless they can verify
>> there is a reachable 6to4 relay.
>>
>> Perhaps in a revised spec it can INSIST on the pingability of the 6to4
>> relay so that CPEs can perform a keepalive check in determining
>> whether to keep IPv6 autoconfiguration enabled.
>>
>>
>> Antonio Querubin
>> whois:  AQ7-ARIN
> 
>