From: Yusuke ENDOH <mame@...>
Date: 2010-04-23T01:58:45+09:00
Subject: [ruby-core:29730] Re: [Bug #3052] DRb::start_service fails to 	detect used port

Hi,

2010/4/23 Chris Schlaeger <cschlaeger@gmail.com>:
> I did some more tests and the problem is most likely not DRb specific.
> I can reproduce this with TCPSocket as well. The system was an
> openSUSE 11.1 and 11.2. Both have IPv6 enabled. The problem does not
> occur when I use 127.0.0.1 instead of localhost. Does that help?
> Should I do another test?


This may be side effect of ipv6 support of ext/socket.
What's printed by:

  require "socket"
  p TCPServer.new("localhost", 1234).addr
  p TCPServer.new("localhost", 1234).addr

?

If the result is, for example:

  ["AF_INET6", 1234, "::1", "::1"]
  ["AF_INET", 1234, "127.0.0.1", "127.0.0.1"]

, this is intended behavior.

The first drb server is bound to ::1:1234, and the second is
127.0.0.1:1234.
You will be able to access both servers to druby://[::1]:1234
and druby://127.0.0.1:1234, respectively.

-- 
Yusuke Endoh <mame@tsg.ne.jp>