Subject: Re: refocusing: Re: [v6tc] Issue 2: service discovery: automaticormanual?

From: "Miguel Angel Diaz" <[email-masked]>
Date: Tue, 18 Jan 2005 10:28:12 +0100

[..........................................]

> 
> +-------+        +---------+
> |  ISP  |--------| NAT Box |-------{ hosts }
> +-------+        +---------+
> 
> If I would configure my home network like this, then still there is no
> way to figure out that my ISP actually uses cistron.nl and not .net as
> in the traceroutes or as the reverse of services etc. SOA's are pointing
> to .net, reverses are .net, but the services reside in the .nl domain.
> And I am not even mentioning the various Virtual ISP's who actually
> outsource everything. That is why I wonder how Miguel et al are going to
> use these nice DNS SRV records ;)
> 

With reverse DNS we can get the domain name, at least one valid to make the DNS query.

dig soa -x 195.64.92.136 +noall +authority

and extract the domain from the authoritative DNS server.

Remember that it is necessary that the ISP is in charge of setup the DNS servers that manage the domain extracted with this method (cistron.nl) with the proper entries for _teredo.udp, _6to4._ipv6, etc SRV RR, but this is what we propose: a method so that ISPs announce TEPs on their networks and a method so that applications can discover such TEPs on the ISPs' networks by using DNS.

> Also assuming that you can figure it out, if there is no DNS SRV record
> in the upstream, what then? No service for that user? There is nothing
> automatic in this setup then as there are almost no ISP's doing IPv6 in
> the first place, that is why there is 6to4 and Teredo, who fit the bill
> perfectly as I already mentioned.

If the ISP deploys one or several TEPs on its network it would have to setup its authoritative DNS servers to support the discovery method, on the contrary user (rather his OS, application, etc) couldn't find the TEP.

The discovery method is pointed to both the ISPs and the application developers.

There is no much new in this approach. Think in ISATAP discovery method, is similar and it requires that the DNS server is cofigured properly and the implementation makes the DNS query to the server.

Regards
Miguel

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