On Wed, May 13, 2009 at 11:46:29AM +0800, Tech W. <tech...@yahoo.com.cn> wrote a message of 14 lines which said:
> When an upper DNS returns a domain's authorised DNS server, will it > also returns the authorised DNS server's IP address? So glue record > works as this way? Why don't you test? Computer science is an experimental science. % dig @a.nic.fr A www.google.fr ; <<>> DiG 9.5.1-P1 <<>> @a.nic.fr A www.google.fr ; (2 servers found) ;; global options: printcmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 47237 ;; flags: qr rd; QUERY: 1, ANSWER: 0, AUTHORITY: 4, ADDITIONAL: 1 ;; WARNING: recursion requested but not available ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 4096 ;; QUESTION SECTION: ;www.google.fr. IN A ;; AUTHORITY SECTION: google.fr. 172800 IN NS ns1.google.com. google.fr. 172800 IN NS ns2.google.com. google.fr. 172800 IN NS ns3.google.com. google.fr. 172800 IN NS ns4.google.com. ;; Query time: 2 msec ;; SERVER: 192.93.0.129#53(192.93.0.129) ;; WHEN: Wed May 13 09:00:19 2009 ;; MSG SIZE rcvd: 124 No glue was sent back, since all google.fr nameservers are outside of google.fr. % dig @a.nic.fr A www.wanadoo.fr ; <<>> DiG 9.5.1-P1 <<>> @a.nic.fr A www.wanadoo.fr ; (2 servers found) ;; global options: printcmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 29937 ;; flags: qr rd; QUERY: 1, ANSWER: 0, AUTHORITY: 4, ADDITIONAL: 5 ;; WARNING: recursion requested but not available ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 4096 ;; QUESTION SECTION: ;www.wanadoo.fr. IN A ;; AUTHORITY SECTION: wanadoo.fr. 172800 IN NS ns11.wanadoo.fr. wanadoo.fr. 172800 IN NS ns.wanadoo.fr. wanadoo.fr. 172800 IN NS ns2.wanadoo.fr. wanadoo.fr. 172800 IN NS ns10.wanadoo.fr. ;; ADDITIONAL SECTION: ns.wanadoo.fr. 172800 IN A 80.12.255.24 ns2.wanadoo.fr. 172800 IN A 80.12.255.159 ns10.wanadoo.fr. 172800 IN A 80.12.255.23 ns11.wanadoo.fr. 172800 IN A 80.12.255.152 ;; Query time: 2 msec ;; SERVER: 192.93.0.129#53(192.93.0.129) ;; WHEN: Wed May 13 09:01:49 2009 ;; MSG SIZE rcvd: 180 Glue was sent back since wanadoo.fr's name servers are under wanadoo.fr (so you could not find their IP addresses, without the glue records). _______________________________________________ bind-users mailing list bind-users@lists.isc.org https://lists.isc.org/mailman/listinfo/bind-users
