DataBaseds: Does not listen on ipv4 port 10000

[t-b]

Using debian unstable/tango-9.4-rc6 packages.

• Install: apt install -t experimental tango-db tango-starter tango-test
• Use default options when asked
• start database just to be sure systemctl start tango-db

Looking who is listening

root@debian:/home/thomas/devel/tango-9.3.4-rc6/cppserver/database# netstat -ltnp | grep DataBaseds
tcp        0      0 0.0.0.0:37329           0.0.0.0:*               LISTEN      6840/DataBaseds     
tcp6       0      0 :::10000                :::*                    LISTEN      6840/DataBaseds     

reveals that we only listen on port 10000 for ipv6 and on some random port for ipv4.

[mliszcz]

Hi @t-b,
Can you actually reach DataBaseds over IPv4? If it works it means that it may be using 'IPv4-mapped IPv6' address. In such case you will get just one entry in netstat output. I've seen some applications doing this but I don't recall now if it was DataBaseds or something else.

See:
https://serverfault.com/questions/755765/httpd-listening-in-ipv6-according-netstat-but-reacheable-in-ipv4
https://unix.stackexchange.com/questions/152612/netstat-why-are-ipv4-daemons-listening-to-ports-listed-only-in-a-inet6

[mliszcz]

The random IPv4 port is most likely ephemeral port assigned to zmq event channel.

[t-b]

@mliszcz Thanks, this does explain it. I've retried with

thomas@debian:~$ TANGO_HOST=127.0.0.1:10000 /usr/lib/tango/TangoTest test
Ready to accept request

and indeed netstat's reporting got me fooled.