Re: Conclusion: Re: [v6tc] Issue 2: service discovery: automaticor manual?

Miguel,

On Wed, 2005-01-19 at 10:53, ext Miguel Angel Diaz wrote:
> > On Tue, 2005-01-18 at 05:52 -0800, Alain Durand wrote:
> >> On Jan 18, 2005, at 4:25 AM, Pekka Savola wrote:
> >> > What seems left on the table from the generic solutions is an IPv4 
> >> > anycast address.  It has some problems, but maybe these problems are 
> >> > smaller than with others.
> >> 
> >> I think the discussion from the last few days has shown few things:
> >> 
> >> a) DNS based solutions (forward or reverse) do not work in all 
> >> situations and in particular do not work well in the case where a NAT box is 
> >> present, which seems to be a show stopper.
> 
> I disagree partially with that assertion because by using reverse+forward DNS with either the public IP of the customer or the customer's default gateway would work in the most cases. Only two conditions are needed:
> 
> - ISP configures properly the reverse DNS
> - ISP configures properly the DNS server to be included on the reverse domain the names for the discovery services.
> 
> Whit this assumptions even with local DNS server on the customer network, the discovery based on DNS will work.
> 
> How to find out the public IP is not so hard as it has pointed before. STUN is only an alternative, but there is other ones even much better.

I think there has been now some discussion on this. The problem with
your proposal really is that expect something to happen, which boils
down to the same problems as the original problem: Finding the server
that can give you your the public IP address.

In addition, your solutions sadly need a certain kind of network
deployment that might or might not be true always. Expecting that the
ISP has deployed the network in a certain special way or even worse
assuming something from the user's home network leads to broken
assumptions.

Cheers,

Jonne.
> 
> Regards
> Miguel
> 
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-- 
Jonne Soininen
Nokia

Tel: +358 40 527 46 34
E-mail: jonne.soininen@nokia.com

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