anything that encourages multi-faced DNS is a bad idea. Keith
> At 02:43 AM 10/28/02, Markku Savela wrote: > > > > When a multi-sited implementation gets site-local addresses from > > > the DNS (assuming that it runs two-faced DNS and returns site-locals), > > > how will the multi-sited host know which site the addresses are in? > > > >My guess, and tentative implementation is that the resolver library > >completes the scope id to the address using the interface from which > >the DNS reply came in. > > I keep winding-up back here, myself, but it isn't really a satisfactory > answer for several reasons: > > (1) A multi-sited node might receive different sets of > addresses in response to the same query, based on > which site's DNS server was tried first. There is > no provision to try another DNS server if the first > one succeeds, so there is no way to be sure you've > gotten all of the available addresses to reach a > node. > > (2) This solution presumes some relationship between the > routing hierarchy and the organization of DNS servers. > For example, it assumes that I will use the DNS > server that is configured with two-faced DNS for my > site. > > (3) The two-faced DNS solution requires that we store routing > information in a DNS configuration file. This creates > another way for the network to break when routing > information changes. > > (4) If the DNS requests are done via global addresses, I am > not sure that it is safe to assume that the results > will always come back through the correct interface. > What if there were a partition in Site1, but parts of > Site1 could still reach other parts of Site1 using > global addresses, by sending across the global > Internet. Is that possible? > > Anyway, we'd certainly have to document the "two-faced" DNS concept > and describe this solution in more detail before I'd feel comfortable > counting on it to work. > > Margaret > > > -------------------------------------------------------------------- > IETF IPng Working Group Mailing List > IPng Home Page: http://playground.sun.com/ipng > FTP archive: ftp://playground.sun.com/pub/ipng > Direct all administrative requests to [EMAIL PROTECTED] > -------------------------------------------------------------------- -------------------------------------------------------------------- IETF IPng Working Group Mailing List IPng Home Page: http://playground.sun.com/ipng FTP archive: ftp://playground.sun.com/pub/ipng Direct all administrative requests to [EMAIL PROTECTED] --------------------------------------------------------------------
