Hi,
Now I am testing the recursive PTR query of BIND 9.3.1.
The DNS Client1 request for PTR RRs for 10.1.168.192.IN-ADDR.ARPA to DNS Server1.
% dig @192.168.0.10 10.1.168.192.IN-ADDR.ARPA. -t PTR
DNS Server1 receved standard query from DNS Client1, and transmits recursive query.
It's sequence flow are described as following.
When DNS Server1 received No. 5 packet, I expect that DNS Server1 sends
QNAME=10.1.168.192.IN-ADDR.ARPA, QTYPE=PTR query to DNS Server4 (No. 6 sequence).
However DNS Server1 sends QNAME=NS4.example.org, QTYPE=A query to DNS Server2.
Q. Why DNS Server1 doesn't send QNAME=10.1.168.192.IN-ADDR.ARPA, QTYPE=PTR query to
DNS Server4 as authority of 168.192.IN-ADDR.ARPA?
Topology
---------
IN-ADDR.ARPA domain 192.IN-ADDR.ARPA domain 168.192.IN-ADDR.ARPA domain
DNS Server2 DNS Server3 DNS Server4
|A.ROOT.NET |NS3.example.net |NS4.example.org
|192.168.1.20 |192.168.1.30 |192.168.1.40
| | |
Net-y --+--------+---------------+------------+-----------+------- 192.168.1/24
| |
| |1.168.192.IN-ADDR.ARPA domain
Router (TN) DNS Server5
| NS5.example.org
|192.168.0.1 192.168.1.50
|
Net-z --+--------+-----------------+-------- 192.168.0/24
| |
| |
DNS Server1 (NUT) DNS Client1 (TN)
NS1.example.com
192.168.0.10 192.168.0.20
Configuration
--------------
named configuration is:
options {
directory "/etc/namedb";
pid-file "/var/run/named/pid";
dump-file "/var/dump/named_dump.db";
statistics-file "/var/stats/named.stats";
listen-on { any;};
listen-on-v6 { any;};
notify no;
recursion yes;
request-ixfr no;
provide-ixfr no;
};
zone "." {
type hint;
file "named.root";
};
zone "example.com" {
type master;
allow-query {any;};
allow-transfer {any;};
file "master/example.com";
};
Zone files
----------
DNS Server1 is a name server for the example.com.
The zone data for the example.com domain is:
$TTL 86400 ; TTL of 1 day
@ IN SOA NS1.example.com. root.example.com. (
2005081600 ; serial
3600 ; refresh every 1 hr
900 ; retry every 15 min
604800 ; expire after a week
3600 ; Minimum TTL of a 1 hr
)
;
IN NS NS1.example.com.
NS1 IN A 192.168.0.10
DNS Server2 is a name server for the root. Root server list on DNS Server1 is:
. 3600000 IN NS A.ROOT.NET.
A.ROOT.NET. 3600000 A 192.168.1.20
Sequence flow.
--------------
* TN: Tester node
* NUT: Node under test
<--------------- TN ---------------------------->
DNS Client1 (TN) DNS Server1 (NUT) DNS Server2 DNS Server3 DNS Server4 DNS Server5
| | | | | |
|----------------------------->| | | | |
| 1. Send standard query | | | | |
| QNAME | | | | |
| =10.1.168.192.IN-ADDR.ARPA | | | | |
| QTYPE=PTR | | | | |
| |-------------------------------->| | | |
| | 2. Recv standard query | | | |
| | QNAME | | | |
| | =10.1.168.192.IN-ADDR.ARPA | | | |
| | QTYPE=PTR | | | |
| | | | | |
| |<--------------------------------| | | |
| | 3. Send standard query response | | | |
| | QNAME | | | |
| | =10.1.168.192.IN-ADDR.ARPA | | | |
| | QTYPE=PTR | | | |
| | AUTHORITY Name | | | |
| | =192.IN-ADDR.ARPA | | | |
| | AUTHORITY NSDNAME | | | |
| | =NS3.example.net | | | |
| | ADDITIONAL Name | | | |
| | =NS3.example.net | | | |
| | ADDITIONAL Address | | | |
| | =192.168.1.30 | | | |
| | | | | |
| | v | | |
| | | | |
| |-------------------------------------------->| | |
| | 4. Recv standard query | | |
| | QNAME | | |
| | =10.1.168.192.IN-ADDR.ARPA | | |
| | QTYPE=PTR | | |
| | | | |
| |<--------------------------------------------| | |
| | 5. Send standard query response | | |
| | QNAME | | |
| | =10.1.168.192.IN-ADDR.ARPA | | |
| | QTYPE=PTR | | |
| | AUTHORITY Name | | |
| | = 168.192.IN-ADDR.ARPA | | |
| | AUTHORITY NSDNAME | | |
| | = NS4.example.org | | |
| | ADDITIONAL Name | | |
| | = NS4.example.org | | |
| | ADDITIONAL Address | | |
| | = 192.168.1.40 | | |
| | | | |
| | v | |
| | | |
| |-------------------------------------------------------->| |
| | 6. Send standard query | |
| | QNAME | |
| | =10.1.168.192.IN-ADDR.ARPA | |
| | QTYPE=PTR | |
| | | |
| |<--------------------------------------------------------| |
| | 7. Send standard query response| |
| | QNAME | |
| | =10.1.168.192.IN-ADDR.ARPA | |
| | QTYPE=PTR | |
| | AUTHORITY Name | |
| | = 1.168.192.IN-ADDR.ARPA | |
| | AUTHORITY NSDNAME | |
| | = NS5.example.org | |
| | ADDITIONAL Name | |
| | = NS5.example.org | |
| | ADDITIONAL Address | |
| | = 192.168.1.50 | |
| | | |
| | v |
| | |
| |-------------------------------------------------------------------->|
| | 8. Send standard query |
| | QNAME |
| | =10.1.168.192.IN-ADDR.ARPA |
| | QTYPE=PTR |
| | |
| |<--------------------------------------------------------------------|
| | 9. Send standard query response |
| | QNAME |
| | =10.1.168.192.IN-ADDR.ARPA |
| | QTYPE=PTR |
| | ANSWER NAME |
| | = 10.1.168.192.IN-ADDR.ARPA |
| | ANSWER PTRDNAME |
| | = A.example.org |
| | AUTHORITY Name |
| | = 1.168.192.IN-ADDR.ARPA |
| | AUTHORITY NSDNAME |
| | = NS5.example.org |
| | ADDITIONAL Name |
| | = NS5.example.org |
| | ADDITIONAL Address |
| | = 192.168.1.50 |
|<-----------------------------| v
| 10. Recv Standard query |
| response |
| QNAME |
| = 10.1.168.192.IN-ADDR.ARPA|
| QTYPE=PTR |
| ANSWER NAME |
| = 10.1.168.192.IN-ADDR.ARPA|
| ANSWER PTRDNAME |
| = A.example.org |
| AUTHORITY Name |
| = 1.168.192.IN-ADDR.ARPA |
| AUTHORITY NSDNAME |
| = NS5.example.org |
| ADDITIONAL Name |
| = NS5.example.org |
| ADDITIONAL Address |
| = 192.168.1.50 |
v v
Best regards,
--
Nobumichi Ozoe
IPv6 Business
Network & Software Development Dept.
Yokogawa Electric Corporation
URL: http://www.yokogawa.com/