From: "Iñaki Baz Castillo" <ibc@...>
Date: 2011-10-31T23:16:38+09:00
Subject: UDPSocket#bind(ip, port) fails under IPv6 !

Hi, the following script shows that UDPSocket#bind fails if the given
IP is IPv6 (however TCPServer does not fail). It occurs with Ruby 1.8
and 1.9.X.

My computer has IPv4 and IPv6 (using Miredo/Teredo).

The script:


-------------------------------------------------------------
#!/usr/bin/ruby

require "socket"


IPv4 = "192.168.1.12"
IPv6 = "2001:0:53aa:64c:187c:3ecb:3419:d1a6"
PORT = 9999


begin
  puts "1) binding in IPv4 TCP..."
  s4 = TCPServer.open IPv4, PORT
  puts "=> OK"
rescue => e
  $stderr.puts "#{e.class}: #{e}"
end

begin
  puts "2) binding in IPv6 TCP..."
  s4 = TCPServer.open IPv6, PORT
  puts "=> OK"
rescue => e
  $stderr.puts "#{e.class}: #{e}"
end

begin
  puts "3) binding in IPv4 UDP..."
  s4 = UDPSocket.new
  s4.bind IPv4, PORT
  puts "=> OK"
rescue => e
  $stderr.puts "#{e.class}: #{e}"
end

begin
  puts "4) binding in IPv6 UDP..."
  s4 = UDPSocket.new
  s4.bind IPv6, PORT
  puts "=> OK"
rescue => e
  $stderr.puts "#{e.class}: #{e}"
end
-------------------------------------------------------------



Result of the script:

----------------------
1) binding in IPv4 TCP...
=> OK

2) binding in IPv6 TCP...
=> OK

3) binding in IPv4 UDP...
=> OK

4) binding in IPv6 UDP...
Errno::EAFNOSUPPORT: Address family not supported by protocol - bind(2)
----------------------


Is it a known issue? If not I will report it.

-- 
Iñaki Baz Castillo
<ibc@aliax.net>