Issue #5525 has been updated by Iñaki Baz Castillo.


Thanks a lot. But why is it required just for UDP? In TCP I can use "TCPServer.new some_ipv6, port" with no problem. Why UDPSocket requires special handling for IPv6?
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Bug #5525: UDPSocket#bind(ip, port) fails under IPv6 => Errno::EAFNOSUPPORT
http://redmine.ruby-lang.org/issues/5525

Author: Iñaki Baz Castillo
Status: Rejected
Priority: Normal
Assignee: 
Category: lib
Target version: 
ruby -v: ruby 1.9.3dev (2011-07-31 revision 32789) [x86_64-linux]


This bug can be reproduced in Ruby 1.8 as well.

The following script shows that UDPSocket#bind fails (Errno::EAFNOSUPPORT) if the given IP is IPv6 (however TCPServer does not fail).

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


-------------------------------------------------------------
require "socket"


IPv4 = "192.168.1.12"
IPv6 = "2001:0:53aa:64c:187c:3ecb:2419: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)
----------------------


Tested with:
- ruby 1.9.3dev (2011-07-31 revision 32789) [x86_64-linux]
- ruby 1.9.2p290 (2011-07-09 revision 32553) [x86_64-linux]
- ruby 1.8.7 (2011-06-30 patchlevel 352) [x86_64-linux]




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