DNS problem

[mmalchau]

Hi, I'm a student trying to reproduce your scalability results and learn more about nmos.
I'm running the nmos-mininet on Ubuntu-Server 14.04 as a VM in VirtualBox and Ubuntu 18.04 as host. I have a bunch of issues which are somehow related to each other I guess:

After setting up the NMOS extention I tried h1 ping -c1 "h2" to confirm DNS is working within the virtual network.
But > >unknown host h2 << is all I get

After that I tried:

sudo bin/nmos-mn
A simple network will be created, almost as before.
Type mdnsd h1 h4 to run mdnsd for all hosts (h1 to h4).
Type start_registry h1 to start up a registry on host h1.
Type start_node h2 h4 to start up nodes on hosts h2, h3 and h4.
Type query_nodes h1 to print a list of the registered nodes.

The commands are working fine, except query_nodes h1. I get this error message:

Error: No JSON object could be decoded
Unable to find Query API from host: h1

For that reason I checked whether nmos-cpp is working fine.
I ran the nmos-cpp-test script:

nmos-cpp-test is a Catch v1.10.0 host application.
Run with -? for options

-------------------------------------------------------------------------------
testMdnsAdvertiseAddress
-------------------------------------------------------------------------------
/home/mininet/nmos-cpp/Development/mdns/test/mdns_test.cpp:76
...............................................................................

/home/mininet/nmos-cpp/Development/mdns/test/mdns_test.cpp:85: FAILED:
  CATCH_CHECK( advertiser.register_address("test-mdns-advertise-address", "127.0.0.1", {}).get() )
with expansion:
  false

/home/mininet/nmos-cpp/Development/mdns/test/mdns_test.cpp:87: FAILED:
  CATCH_REQUIRE( gate.hasLogMessage("Registered address: 127.0.0.1 for hostname: test-mdns-advertise-address") )
with expansion:
  false

-------------------------------------------------------------------------------
testMdnsAdvertiseAPIs
-------------------------------------------------------------------------------
/home/mininet/nmos-cpp/Development/mdns/test/mdns_test.cpp:93
...............................................................................

/home/mininet/nmos-cpp/Development/mdns/test/mdns_test.cpp:109: FAILED:
  CATCH_CHECK( advertiser.register_service("test-mdns-advertise-1", "_sea-lion-test1._tcp", testPort1, {}, {}, textRecords).get() )
with expansion:
  false

/home/mininet/nmos-cpp/Development/mdns/test/mdns_test.cpp:110: FAILED:
  CATCH_CHECK( advertiser.register_service("test-mdns-advertise-2", "_sea-lion-test1._tcp", testPort2, {}, {}, textRecords).get() )
with expansion:
  false

/home/mininet/nmos-cpp/Development/mdns/test/mdns_test.cpp:111: FAILED:
  CATCH_CHECK( advertiser.register_service("test-mdns-advertise-3", "_sea-lion-test2._tcp", testPort3, {}, {}, textRecords).get() )
with expansion:
  false

/home/mininet/nmos-cpp/Development/mdns/test/mdns_test.cpp:113: FAILED:
  CATCH_REQUIRE( gate.hasLogMessage("Registered advertisement for: test-mdns-advertise-1._sea-lion-test1._tcp") )
with expansion:
  false

-------------------------------------------------------------------------------
testMdnsBrowseAPIs
-------------------------------------------------------------------------------
/home/mininet/nmos-cpp/Development/mdns/test/mdns_test.cpp:121
...............................................................................

/home/mininet/nmos-cpp/Development/mdns/test/mdns_test.cpp:137: FAILED:
  CATCH_CHECK( advertiser.register_service("test-mdns-browse-1", "_sea-lion-test1._tcp", testPort1, {}, {}, textRecords).get() )
with expansion:
  false

/home/mininet/nmos-cpp/Development/mdns/test/mdns_test.cpp:138: FAILED:
  CATCH_CHECK( advertiser.register_service("test-mdns-browse-2", "_sea-lion-test1._tcp", testPort2, {}, {}, textRecords).get() )
with expansion:
  false

/home/mininet/nmos-cpp/Development/mdns/test/mdns_test.cpp:139: FAILED:
  CATCH_CHECK( advertiser.register_service("test-mdns-browse-3", "_sea-lion-test2._tcp", testPort3, {}, {}, textRecords).get() )
with expansion:
  false

/home/mininet/nmos-cpp/Development/mdns/test/mdns_test.cpp:141: FAILED:
  CATCH_REQUIRE( gate.hasLogMessage("Registered advertisement for: test-mdns-browse-1._sea-lion-test1._tcp") )
with expansion:
  false

-------------------------------------------------------------------------------
testMdnsResolveAPIs
-------------------------------------------------------------------------------
/home/mininet/nmos-cpp/Development/mdns/test/mdns_test.cpp:200
...............................................................................

/home/mininet/nmos-cpp/Development/mdns/test/mdns_test.cpp:229: FAILED:
  CATCH_CHECK( advertiser.register_service("test-mdns-resolve-1", "_sea-lion-test1._tcp", testPort1, {}, {}, textRecords).get() )
with expansion:
  false

/home/mininet/nmos-cpp/Development/mdns/test/mdns_test.cpp:233: FAILED:
  CATCH_REQUIRE( gate.hasLogMessage("Registered advertisement for: test-mdns-resolve-1._sea-lion-test1._tcp") )
with expansion:
  false

===============================================================================
test cases:  49 |  45 passed |  4 failed
assertions: 449 | 437 passed | 12 failed

Did I missed something during installation or setup?
Thanks very much

[garethsb]

Within Mininet CLI, h1 ping - c1 h2 should work as it doesn't require DNS, etc.
If that works, but h1 ping -c1 "h2" doesn't, that does suggest a DNS problem.
Basic DNS within Mininet can be configured using dnsmasq. The install directory has scripts to build it, as well as a Patch script to configure it to be used, and the simple mn-hosts script to generate a simple additional hosts file.
Did you use those as part of the installation?

The later errors are related to multicast DNS-SD. To start the mDNS daemon, there's an mdnsd command in the nmos-mn additions.

[mmalchau]

Within Mininet CLI, h1 ping - c1 h2 should work as it doesn't require DNS

h1 ping - c1 h2 works but but h1 ping -c1 "h2" doesn't

Did you use those as part of the installation?

Yes, I ran the BuildDnsmasq.sh script within the SetupPart2.sh script.
I tried to build dnsmasq again. It is installed and up to date.

[t-schaefer]

Hey,
I happen to have the same issue even as I ran the cpp-test. I'm running VBox on Mac. Is there something specific I could configure or check in dnsmasq to activate DNS? Is there something else to check first? thank you already!