AC68U dnsmasq

[Catalin Nepoty]

I am not sure if this is an issue or if is just a feature which was added later, and I missed the release notes. A few years back I added the following lines in /jffs/configs/dnsmasq.conf.add in order to do reverse DNS for my IPs:

listen-address=127.0.0.1,192.168.50.1,86.120.999.33
log-queries
local=/comp.mydomain.tld/
srv-host=_ldap._tcp,janus.comp.mydomain.tld,389
dhcp-boot=/pxelinux.0,ops,192.168.50.5

address=/gw.mydomain.tld/86.120.999.33
ptr-record=33.999.120.86.in-addr.arpa.,gw.mydomain.tld
address=/mercury.mydomain.tld/86.120.999.61
ptr-record=61.999.120.86.in-addr.arpa.,mercury.mydomain.tld
address=/sender.mydomain.tld/86.120.999.50
ptr-record=50.999.120.86.in-addr.arpa.,sender.mydomain.tld
address=/sender.lectiiinot.ro/86.120.999.56
ptr-record=56.999.120.86.in-addr.arpa.,sender.otherdomain.ro
address=/mx.mydomain.tld/86.120.999.54
ptr-record=54.999.120.86.in-addr.arpa.,mx.mydomain.tld
address=/outgoing.mydomain.tld/86.120.999.59
ptr-record=59.999.120.86.in-addr.arpa.,outgoing.mydomain.tld
address=/masterns.mydomain.tld/86.120.999.38
ptr-record=38.999.120.86.in-addr.arpa.,masterns.mydomain.tld
address=/janus/192.168.50.28
address=/diskstation/192.168.50.27

Yesterday I discovered that the PTR queries are not working anymore. For example, when I try to query the domain it return SRVFAIL.

nslookup
set type=PTR
server 192.168.50.1
Default server: 192.168.50.1
Address: 192.168.50.1#53
86.120.999.59
Server: 192.168.50.1
Address: 192.168.50.1#53

** server can't find 59.999.120.86.in-addr.arpa: SERVFAIL

The IPs are Provider Assigned. I checked with my ISP, and they replied that the delegation for my IP subnet is still active.

[I obfuscated the information a bit. I can disclose for who needs the real IPs]

 

[dave14305]

Since it's an advanced dnsmasq function you're using, you can check the dnsmasq CHANGELOG from the 384.14_2 release: https://github.com/RMerl/asuswrt-me...mainline/release/src/router/dnsmasq/CHANGELOG

Also re-read the dnsmasq MAN page in case the ptr-record feature changed. Any reason not to use the host-record parameter?
http://www.thekelleys.org.uk/dnsmasq/docs/dnsmasq-man.html

Maybe someone else who has done this will chime in with their experience. How long ago would you estimate it still worked? And what router and specific firmware version are you running?

 

[Catalin Nepoty]

I estimate that this has some issues since half a year ago, but don't have an evidence.
Currently we are having:
AC-68U
Firmware Version:384.14_2