On Sat, Jun 18, 2011 at 1:35 PM, Owen DeLong <o...@delong.com> wrote: > This ignores the extra baggage that tends to come along in a DNS payload. > Just the root: ..... > Note, none of these came with glue. They ONLY included the name data. > Had they come with glue, we would easily have been over 512 in both > cases just for IPv4, let alone a v4/v6 combination.
None of those come with glue, ....really? For the root zone, I currently see a fully populated NS response with a fair bit of glue that is 512 bytes total, and a majority of that 512 bytes response is the additional section. That is, with no glue, you would be looking at approximately 200 octets. In addition when I dig against 2001:dc3::35, the root server responds to my query IN with glue for all A through L .root-servers, and two pieces of AAAA glue without exceeding 492 message size. However, the root zone and gTLD zones are quite special, and a very significant exception to the norm for number of NS entries authoritative for a zone. Few domains have more than 3 NS. ;; MSG SIZE rcvd: 512 # dig +norecurse -t NS . @198.41.0.4 ; <<>> DiG 9.3.6-P1-RedHat-9.3.6-16.P1.el5 <<>> +norecurse -t NS . @198.41.0.4 ;; global options: printcmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 46162 ;; flags: qr aa; QUERY: 1, ANSWER: 13, AUTHORITY: 0, ADDITIONAL: 14 ;; QUESTION SECTION: ;. IN NS ;; ANSWER SECTION: . 518400 IN NS b.root-servers.net. . 518400 IN NS e.root-servers.net. . 518400 IN NS k.root-servers.net. . 518400 IN NS m.root-servers.net. . 518400 IN NS f.root-servers.net. . 518400 IN NS c.root-servers.net. . 518400 IN NS g.root-servers.net. . 518400 IN NS j.root-servers.net. . 518400 IN NS h.root-servers.net. . 518400 IN NS d.root-servers.net. . 518400 IN NS a.root-servers.net. . 518400 IN NS i.root-servers.net. . 518400 IN NS l.root-servers.net. ;; ADDITIONAL SECTION: b.root-servers.net. 3600000 IN A 192.228.79.201 e.root-servers.net. 3600000 IN A 192.203.230.10 k.root-servers.net. 3600000 IN A 193.0.14.129 k.root-servers.net. 3600000 IN AAAA 2001:7fd::1 m.root-servers.net. 3600000 IN A 202.12.27.33 m.root-servers.net. 3600000 IN AAAA 2001:dc3::35 f.root-servers.net. 3600000 IN A 192.5.5.241 f.root-servers.net. 3600000 IN AAAA 2001:500:2f::f c.root-servers.net. 3600000 IN A 192.33.4.12 g.root-servers.net. 3600000 IN A 192.112.36.4 j.root-servers.net. 3600000 IN A 192.58.128.30 j.root-servers.net. 3600000 IN AAAA 2001:503:c27::2:30 h.root-servers.net. 3600000 IN A 128.63.2.53 h.root-servers.net. 3600000 IN AAAA 2001:500:1::803f:235 ;; Query time: 203 msec ;; SERVER: 198.41.0.4#53(198.41.0.4) ;; WHEN: Sun Jun 19 13:17:31 2011 ;; MSG SIZE rcvd: 512 # dig +norecurse -t NS . @2001:dc3::35 ; <<>> DiG 9.3.6-P1-RedHat-9.3.6-16.P1.el5 <<>> +norecurse -t NS . @m.root-servers.net ;; global options: printcmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 1931 ;; flags: qr aa; QUERY: 1, ANSWER: 13, AUTHORITY: 0, ADDITIONAL: 15 ;; QUESTION SECTION: ;. IN NS ;; ANSWER SECTION: . 518400 IN NS c.root-servers.net. . 518400 IN NS j.root-servers.net. . 518400 IN NS h.root-servers.net. . 518400 IN NS g.root-servers.net. . 518400 IN NS b.root-servers.net. . 518400 IN NS f.root-servers.net. . 518400 IN NS l.root-servers.net. . 518400 IN NS i.root-servers.net. . 518400 IN NS m.root-servers.net. . 518400 IN NS d.root-servers.net. . 518400 IN NS k.root-servers.net. . 518400 IN NS e.root-servers.net. . 518400 IN NS a.root-servers.net. ;; ADDITIONAL SECTION: a.root-servers.net. 3600000 IN A 198.41.0.4 b.root-servers.net. 3600000 IN A 192.228.79.201 c.root-servers.net. 3600000 IN A 192.33.4.12 d.root-servers.net. 3600000 IN A 128.8.10.90 e.root-servers.net. 3600000 IN A 192.203.230.10 f.root-servers.net. 3600000 IN A 192.5.5.241 g.root-servers.net. 3600000 IN A 192.112.36.4 h.root-servers.net. 3600000 IN A 128.63.2.53 i.root-servers.net. 3600000 IN A 192.36.148.17 j.root-servers.net. 3600000 IN A 192.58.128.30 k.root-servers.net. 3600000 IN A 193.0.14.129 l.root-servers.net. 3600000 IN A 199.7.83.42 m.root-servers.net. 3600000 IN A 202.12.27.33 a.root-servers.net. 3600000 IN AAAA 2001:503:ba3e::2:30 d.root-servers.net. 3600000 IN AAAA 2001:500:2d::d ;; Query time: 88 msec ;; SERVER: 2001:dc3::35#53(2001:dc3::35) ;; WHEN: Sun Jun 19 13:35:41 2011 ;; MSG SIZE rcvd: 492 -- -JH
