On Fri, Jun 29, 2012 at 4:09 PM, Ralph Droms <[email protected]> wrote:
> > On Jun 29, 2012, at 3:58 PM 6/29/12, james woodyatt wrote: > > > On Jun 29, 2012, at 11:27 , Michael Thomas <[email protected]> wrote: > >> > >> Maybe I can add some fuel to Olafur's fire. I'd like to say that the > homenet name service MUST be DNS. > > > > Let's go further. Let's say that it must be DNS-Based Service Discovery > [I-D.cheshire-dnsext-dns-sd], which has been in the RFC Editor Queue for > 199 days at this point, so one imagines that it stands a decent chance of > being a published RFC by the time HOMENET finishes its first round of major > work. > > Hear, hear! > Well, DNS-Based Service Discovery addresses just one kind of requirement: > listing entities that provide a certain kind of service; perhaps > generalizable to resolution based on a characteristic or set of > characteristics that might return more than one response to the resolution > request. At some point, there needs to be a mechanism for resolving an > identity to a single IP address. > > Actually, a Multicast DNS responder (mDNS is the multicast version of DNS-SD) will allow you to resolve A, AAAA records: Kerrys-MacBook-Pro:6in4 kerlyn$ dig -p 5353 @224.0.0.251 _http._tcp.local PTR <<<< We first discover web servers ; <<>> DiG 9.7.3-P3 <<>> -p 5353 @224.0.0.251 _http._tcp.local PTR ; (1 server found) ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 33690 ;; flags: qr aa; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 4 ;; QUESTION SECTION: ;_http._tcp.local. IN PTR ;; ANSWER SECTION: _http._tcp.local. 10 IN PTR Officejet\032Pro\0328500\032A909g\032[4C0EA4]._http._tcp.local. ;; ADDITIONAL SECTION: Officejet\032Pro\0328500\032A909g\032[4C0EA4]._http._tcp.local. 10 IN SRV 0 0 80 HP4C0EA4.local. Officejet\032Pro\0328500\032A909g\032[4C0EA4]._http._tcp.local. 10 IN TXT "" HP4C0EA4.local. 10 IN A 192.168.1.31 HP4C0EA4.local. 10 IN AAAA fe80::dad3:85ff:fe4c:ea4 ;; Query time: 20 msec ;; SERVER: 192.168.1.31#5353(224.0.0.251) ;; WHEN: Fri Jun 29 16:13:10 2012 ;; MSG SIZE rcvd: 168 Kerrys-MacBook-Pro:6in4 kerlyn$ dig -p 5353 @224.0.0.251 HP4C0EA4.local A <<<< We can also resolve the host record ; <<>> DiG 9.7.3-P3 <<>> -p 5353 @224.0.0.251 HP4C0EA4.local A ; (1 server found) ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 40117 ;; flags: qr aa; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0 ;; QUESTION SECTION: ;HP4C0EA4.local. IN A ;; ANSWER SECTION: HP4C0EA4.local. 10 IN A 192.168.1.31 ;; Query time: 1 msec ;; SERVER: 192.168.1.31#5353(224.0.0.251) ;; WHEN: Fri Jun 29 16:13:39 2012 ;; MSG SIZE rcvd: 48 Kerrys-MacBook-Pro:6in4 kerlyn$ dig -p 5353 @192.168.1.31 HP4C0EA4.local A <<<< We can just as easily unicast the query ; <<>> DiG 9.7.3-P3 <<>> -p 5353 @192.168.1.31 HP4C0EA4.local A ; (1 server found) ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 32090 ;; flags: qr aa; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0 ;; QUESTION SECTION: ;HP4C0EA4.local. IN A ;; ANSWER SECTION: HP4C0EA4.local. 10 IN A 192.168.1.31 ;; Query time: 2 msec ;; SERVER: 192.168.1.31#5353(192.168.1.31) ;; WHEN: Fri Jun 29 16:17:47 2012 ;; MSG SIZE rcvd: 48 > - Ralph > > > > > > > -- > > james woodyatt <[email protected]> > > member of technical staff, core os networking > > > > [*] <http://datatracker.ietf.org/doc/draft-cheshire-dnsext-dns-sd/> > > _______________________________________________ > > homenet mailing list > > [email protected] > > https://www.ietf.org/mailman/listinfo/homenet > > _______________________________________________ > homenet mailing list > [email protected] > https://www.ietf.org/mailman/listinfo/homenet >
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