Matus UHLAR - fantomas <uh...@fantomas.sk> wrote:
>
> I know. But there are cases you just have much of data in the DNS and what I
> am asking is, if BIND really does skip authority section, if it helps to
> avoid sending truncated packets.
Yes it does. For example, have a look at responses to queries for dotat.at
in mx for various buffer sizes and observe that RRsets are dropped but the
TC bit is not set.
; <<>> DiG 9.9.2-vjs287.12 <<>> +norec +dnssec +ignore +multiline mx dotat.at
@puck.nether.net
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 31890
;; flags: qr aa; QUERY: 1, ANSWER: 2, AUTHORITY: 5, ADDITIONAL: 7
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags: do; udp: 4096
;; QUESTION SECTION:
;dotat.at. IN MX
;; ANSWER SECTION:
dotat.at. 3600 IN MX 1 mx.cam.ac.uk.
dotat.at. 3600 IN RRSIG MX 5 2 3600 (
20121217120814 20121117113945 56700 dotat.at.
FLOLFiTEbnAsBka05qJK9nbY3sknNIbG2zSewoqIUkI1
fnm8PDzOB42WoAI2N4vNcQQVkd560B8hRB5a0+tLLZOB
+lz7EA1uLnqCaINJ46BOA0+hXAcAMZMbzYFfVOTN8T/K
89WkExApwdXxffi2dSGOKXAj4KuM3ryfz1g/n7g= )
;; AUTHORITY SECTION:
dotat.at. 3600 IN NS black.dotat.at.
dotat.at. 3600 IN NS ns1.gratisdns.dk.
dotat.at. 3600 IN NS ns3.gratisdns.dk.
dotat.at. 3600 IN NS puck.nether.net.
dotat.at. 3600 IN RRSIG NS 5 2 3600 (
20121225040504 20121125035952 56700 dotat.at.
Hdvs1a2cdGOezLYbNTr1T47g+ZYA9ceBgUQD1tkHvJjL
0+nwREF/0JRs9Neb/Y+jpe0+PeIcDKCEOyD8GTeyc0ve
Ez4sKt3OmkVUp1QN4gFmaeH/oPnPmhYzIuSrlgLkDwOl
IoiixyHNKdF1Op14uUOS8bG3Qn8/HrHS3VjvogM= )
;; ADDITIONAL SECTION:
puck.nether.net. 86400 IN A 204.42.254.5
puck.nether.net. 86400 IN AAAA 2001:418:3f4::5
black.dotat.at. 3600 IN A 131.111.11.130
black.dotat.at. 3600 IN AAAA 2001:630:212:100:646f:7461:742e:6174
black.dotat.at. 3600 IN RRSIG A 5 3 3600 (
20121217151010 20121117143125 56700 dotat.at.
ASD2mv5bJgCvope4pfPMxG9LULCOgnUEgRfpw6BIYaRi
1wGMbezO2L7e9PVPeZ6vN5Cc0T+faN5NpgT0o9aJTdSK
vRoFABIyNsPAMS41ekPL6KdAoz5vbHvplDaNBIfIXs+B
NMySjVw+K/kDFjdW2ygPaRQb8WzfCQoCUEuUc7Y= )
black.dotat.at. 3600 IN RRSIG AAAA 5 3 3600 (
20121224154647 20121124151930 56700 dotat.at.
sb5EcG/+C8PG4E5BFUVag59M9zDDwxZGAFdgnMHSacVX
2kBPoLx+O7IwyO/wanYFpW/sINojumV0NVvE48AI2Ubs
5R/YKIKwHOwgrbwXB2S86x9xGUIGljMJtN07NxbGGpKS
CDhlGH7za4Au32srZFVNu3cozq0Q20dsWKHQ3DA= )
;; Query time: 93 msec
;; SERVER: 2001:418:3f4::5#53(2001:418:3f4::5)
;; WHEN: Wed Nov 28 18:33:16 2012
;; MSG SIZE rcvd: 922
; <<>> DiG 9.9.2-vjs287.12 <<>> +norec +dnssec +bufsize=512 +ignore +multiline
mx dotat.at @puck.nether.net
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 46694
;; flags: qr aa; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 1
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags: do; udp: 4096
;; QUESTION SECTION:
;dotat.at. IN MX
;; ANSWER SECTION:
dotat.at. 3600 IN MX 1 mx.cam.ac.uk.
dotat.at. 3600 IN RRSIG MX 5 2 3600 (
20121217120814 20121117113945 56700 dotat.at.
FLOLFiTEbnAsBka05qJK9nbY3sknNIbG2zSewoqIUkI1
fnm8PDzOB42WoAI2N4vNcQQVkd560B8hRB5a0+tLLZOB
+lz7EA1uLnqCaINJ46BOA0+hXAcAMZMbzYFfVOTN8T/K
89WkExApwdXxffi2dSGOKXAj4KuM3ryfz1g/n7g= )
;; Query time: 98 msec
;; SERVER: 2001:418:3f4::5#53(2001:418:3f4::5)
;; WHEN: Wed Nov 28 18:35:32 2012
;; MSG SIZE rcvd: 233
Tony.
--
f.anthony.n.finch <d...@dotat.at> http://dotat.at/
Forties, Cromarty: East, veering southeast, 4 or 5, occasionally 6 at first.
Rough, becoming slight or moderate. Showers, rain at first. Moderate or good,
occasionally poor at first.
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