I don't think that's the right behavior. If Client Subnet scope set to 0,
resolver should not cache it.unbound DNS gives me the expected output as it
cache has different entries for different client subnet. Why is pdns recursor's
implementation different?
root@DFW01-CPS02:~# dig @localhost +subnet=52.57.28.138 morpheus-ien.insnw.net
; <<>> DiG 9.11.0-P3 <<>> @localhost +subnet=52.57.28.138 morpheus-ien.insnw.net
; (2 servers found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 30374
;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 2, ADDITIONAL: 3
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
; CLIENT-SUBNET: 52.57.28.138/32/16
;; QUESTION SECTION:
;morpheus-ien.insnw.net.INA
;; ANSWER SECTION:
morpheus-ien.insnw.net.3600INCNAMEien01-fra02.svc.insnw.net.
ien01-fra02.svc.insnw.net. 600INA35.156.66.126
;; AUTHORITY SECTION:
insnw.net.86400INNSns2.insnw.net.
insnw.net.86400INNSns1.insnw.net.
;; ADDITIONAL SECTION:
ns1.insnw.net.86400INA192.33.29.21
ns2.insnw.net.86400INA192.33.29.22
;; Query time: 38 msec
;; SERVER: ::1#53(::1)
;; WHEN: Wed Aug 02 21:57:39 GMT 2017
;; MSG SIZE rcvd: 177
root@DFW01-CPS02:~# dig @localhost morpheus-ien.insnw.net
; <<>> DiG 9.11.0-P3 <<>> @localhost morpheus-ien.insnw.net
; (2 servers found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 15379
;; flags: qr rd ra; QUERY: 1, ANSWER: 3, AUTHORITY: 2, ADDITIONAL: 3
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;morpheus-ien.insnw.net.INA
;; ANSWER SECTION:
morpheus-ien.insnw.net.3600INCNAMEins-091.inscname.net.
ins-091.inscname.net.3600INCNAMEa-sg08sl07.insnw.net.
a-sg08sl07.insnw.net.3600INA192.33.31.183
;; AUTHORITY SECTION:
insnw.net.86382INNSns2.insnw.net.
insnw.net.86382INNSns1.insnw.net.
;; ADDITIONAL SECTION:
ns1.insnw.net.86382INA192.33.29.21
ns2.insnw.net.86382INA192.33.29.22
;; Query time: 133 msec
;; SERVER: ::1#53(::1)
;; WHEN: Wed Aug 02 21:57:57 GMT 2017
;; MSG SIZE rcvd: 191
root@DFW01-CPS02:~# dig @localhost +subnet=52.57.28.138 morpheus-ien.insnw.net
; <<>> DiG 9.11.0-P3 <<>> @localhost +subnet=52.57.28.138 morpheus-ien.insnw.net
; (2 servers found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 16040
;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 2, ADDITIONAL: 3
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
; CLIENT-SUBNET: 52.57.28.138/32/16
;; QUESTION SECTION:
;morpheus-ien.insnw.net.INA
;; ANSWER SECTION:
morpheus-ien.insnw.net.3578INCNAMEien01-fra02.svc.insnw.net.
ien01-fra02.svc.insnw.net. 578INA35.156.66.126
;; AUTHORITY SECTION:
insnw.net.86378INNSns2.insnw.net.
insnw.net.86378INNSns1.insnw.net.
;; ADDITIONAL SECTION:
ns1.insnw.net.86378INA192.33.29.21
ns2.insnw.net.86378INA192.33.29.22
;; Query time: 0 msec
;; SERVER: ::1#53(::1)
;; WHEN: Wed Aug 02 21:58:01 GMT 2017
;; MSG SIZE rcvd: 177
root@DFW01-CPS02:~# dig @localhost +subnet=35.156.66.126 morpheus-ien.insnw.net
; <<>> DiG 9.11.0-P3 <<>> @localhost +subnet=35.156.66.126
morpheus-ien.insnw.net
; (2 servers found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 3792
;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 2, ADDITIONAL: 3
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
; CLIENT-SUBNET: 35.156.66.126/32/14
;; QUESTION SECTION:
;morpheus-ien.insnw.net.INA
;; ANSWER SECTION:
morpheus-ien.insnw.net.3600INCNAMEien01-fra02.svc.insnw.net.
ien01-fra02.svc.insnw.net. 600INA35.156.66.126
;; AUTHORITY SECTION:
insnw.net.86400INNSns2.insnw.net.
insnw.net.86400INNSns1.insnw.net.
;; ADDITIONAL SECTION:
ns1.insnw.net.86400INA192.33.29.21
ns2.insnw.net.86400INA192.33.29.22
;; Query time: 1 msec
;; SERVER: ::1#53(::1)
;; WHEN: Wed Aug 02 21:59:08 GMT 2017
;; MSG SIZE rcvd: 177
root@DFW01-CPS02:~# dig @localhost +subnet=35.156.66.126 morpheus-ien.insnw.net
; <<>> DiG 9.11.0-P3 <<>> @localhost +subnet=35.156.66.126
morpheus-ien.insnw.net
; (2 servers found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 53600
;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 2, ADDITIONAL: 3
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
; CLIENT-SUBNET: 35.156.66.126/32/14
;; QUESTION SECTION:
;morpheus-ien.insnw.net.INA
;; ANSWER SECTION:
morpheus-ien.insnw.net.3593INCNAMEien01-fra02.svc.insnw.net.
ien01-
