From: "David S." <dgjs@...>
Date: 2001-02-04T06:39:52+09:00
Subject: [ruby-talk:10322] Re: TCPServer - bug in documentation ?

On Sun, Feb 04, 2001 at 05:16:45AM +0900, Dave Thomas wrote:
> Michael Neumann <neumann@s-direktnet.de> writes:
> > I tried following code:
> >   require "socket"
> >   s = TCPServer.new(8080)
> >   s.accept
> > 
> > Then 'telnet 192.168.1.1 8080' and got a "Connection refused".
> > (192.168.1.1 is my local IP-adress) But 'telnet localhost 8080'
> > works!!!  (where localhost is 127.0.0.1)
> 
>    dave[ext/socket 14:11:50] ruby -v -e'p RUBY_PLATFORM'
>    ruby 1.6.2 (2001-02-02) [i686-linux]
>    "i686-linux"
> 
>    dave[ext/socket 14:13:10] ruby -r socket -e 's=TCPServer.new(5678);loop{s.accept}'&
> 
>    dave[ext/socket 14:13:48] telnet localhost 5678
>    Trying 127.0.0.1...
>    Connected to localhost.
>    Escape character is '^]'.
>    ^]
>    telnet> Connection closed.
> 
>    dave[ext/socket 14:14:02] telnet zip.local.thomases.com 5678
>    Trying 10.96.0.14...
>    Connected to zip.local.thomases.com.
>    Escape character is '^]'.
>    ^]
>    telnet> Connection closed.
> 

I get the behavior reported by Michael Neumann, because on my machine
"TCPServer.new" without a hostname specified apparently uses IPv6:

	irb(main):002:0> require 'socket'
	true
	irb(main):003:0> s = TCPServer.new(60001)
	#<TCPServer:0x88cb8>
	irb(main):004:0> loop {s.accept}

then

	% telnet localhost 60001
	Trying ::1...			(<= IPv6 representation of 'localhost')
	Connected to localhost.
	Escape character is '^]'.

and

	% telnet 65.3.200.83 60001
	Trying 65.3.200.83...
	telnet: connect to address 65.3.200.83: Connection refused

further

	% netstat -f inet6
	Active Internet connections
	Proto Recv-Q Send-Q  Local Address          Foreign Address        (state)
	tcp6       0      0  localhost.60001        localhost.14609        CLOSE_WAIT
	tcp6       0      0  localhost.14609        localhost.60001        FIN_WAIT_2

My system is OpenBSD 2.8, by the way.

David S.