LuaSocket: trouble getting system ip addresses

[Thijs Schreijer <thijs@...>]

I'm having trouble getting the systems IP addresses.

On Windows this works;
    socket.dns.toip(socket.dns.gethostname())

On Linux (raspberry pi, Ubuntu 10) it doesn't

Test code:
    local socket = require("socket")

    function one(name)
      print('=========='..name..'===========')
      local ip, v = socket.dns.toip(name)
      print('name',v.name,ip)
      print('alias')
      for k,v in pairs(v.alias) do
        print('',k,v)
      end
      print('address')
      for k,v in pairs(v.ip) do
        print('',k,v)
      end
      print('====================================')
    end

    one('localhost')
    one(socket.dns.gethostname())


It delivers:
    pi@raspberrypi ~ $ lua listaddr.lua
    ==========localhost===========
    name    localhost       127.0.0.1
    alias
            1       ip6-localhost
            2       ip6-loopback
    address
            1       127.0.0.1
            2       127.0.0.1
    ====================================
    ==========raspberrypi===========
    name    raspberrypi     127.0.1.1
    alias
    address
            1       127.0.1.1
    ====================================
    pi@raspberrypi ~ $


Where ifconfig gives me:
    pi@raspberrypi ~ $ sudo ifconfig
    eth0      Link encap:Ethernet  HWaddr b8:27:eb:d3:67:dd
              inet addr:192.168.50.5  Bcast:192.168.50.255  Mask:255.255.255.0
              UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
              RX packets:97124 errors:0 dropped:0 overruns:0 frame:0
              TX packets:29418 errors:0 dropped:0 overruns:0 carrier:0
              collisions:0 txqueuelen:1000
              RX bytes:8325137 (7.9 MiB)  TX bytes:8547972 (8.1 MiB)

    lo        Link encap:Local Loopback
              inet addr:127.0.0.1  Mask:255.0.0.0
              UP LOOPBACK RUNNING  MTU:16436  Metric:1
              RX packets:72 errors:0 dropped:0 overruns:0 frame:0
              TX packets:72 errors:0 dropped:0 overruns:0 carrier:0
              collisions:0 txqueuelen:0
              RX bytes:24890 (24.3 KiB)  TX bytes:24890 (24.3 KiB)

    pi@raspberrypi ~ $


The testcode delivers '127.0.1.1' when getting the ip for the hostname. This comes from the /etc/hosts file. Yet ifconfig clearly shows '192.168.50.5' (on eth0).

How would I get a proper list of addresses the current system uses?

Any help is greatly appreciated.
Thijs