[asterisk-bugs] [JIRA] (ASTERISK-28004) PjSIP dns breaks when using ::1 in /etc/resolv.conf

[Isaac McDonald (JIRA)]

Isaac McDonald created ASTERISK-28004:
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             Summary: PjSIP dns breaks when using ::1 in /etc/resolv.conf
                 Key: ASTERISK-28004
                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-28004
             Project: Asterisk
          Issue Type: Bug
      Security Level: None
          Components: pjproject/pjsip
    Affects Versions: 13.22.0
         Environment: CentOS 7.4 64bit
            Reporter: Isaac McDonald


PJSIP DNS resolution breaks when using the IPv6 loopback address as a nameserver in /etc/resolve.conf.

Steps to reproduce: Note that the hostname used in the AOR had a TTL of 60 seconds during my testing to force pjsip not to cache the results

1. Install dnsmasq "yum install dnsmasq"

2. create /etc/dnsmasq.d/dns.conf and add the following:
listen-address=::1,127.0.0.1
no-resolv
server=1.1.1.1

3. Set nameserver in /etc/resolv.conf to IPv6 localhost address:
nameserver ::1

4. Create a pjsip trunk to register with a hostname in the aor. example:
contact=sip:someuser at testhost.example.com:5060

5. Note how SIP registrations to the sip trunk fail. Note how calls via the trunk also fail. It may take a few minutes before you get failures. 

6. Note the following messages in the asterisk log:
'No working DNS nameserver (PJLIB_UTIL_EDNSNOWORKINGNS)' sending OPTIONS request to endpoint

7. Change the nameserver in /etc/resove.conf to:
nameserver 127.0.0.1

8. Reload asterisk "asterisk -rx"core reload"

9. Note how the trunk created in step 4 registers. Calls placed via the trunk also complete.






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