From: Cyril Mougel <cyril.mougel@...>
Date: 2007-05-14T07:18:31+09:00
Subject: Re: No accept Ipv6 in IPAddr

On 5/13/07, Brian Candler <B.Candler@pobox.com> wrote:
> On Mon, May 14, 2007 at 04:41:13AM +0900, Cyril Mougel wrote:
> > I ask me a question since few day and I don't understand why this code
> > doesn't run :
> >
> >   require 'ipaddr'
> >   IPAddr.new '2002:0000:1234:4561'
> >
> > In fact this code raise an Exception :
> >
> >   /usr/lib64/ruby/1.8/ipaddr.rb:422:in `initialize': invalid address
> > (ArgumentError)
>
> Correct - that's not a valid IPv6 address. IPv6 addresses have 128 bits;
> your address has only 64 bits.
>
> irb(main):001:0> require 'ipaddr'
> => true
> irb(main):002:0> IPAddr.new '2002:0000:1234:4561'
> ArgumentError: invalid address
>         from /usr/lib/ruby/1.8/ipaddr.rb:423:in `initialize'
>         from (irb):2
> irb(main):003:0> IPAddr.new '2002:0000:1234:4561/64'
> ArgumentError: invalid address
>         from /usr/lib/ruby/1.8/ipaddr.rb:423:in `initialize'
>         from (irb):3
> irb(main):004:0> IPAddr.new '2002:0000:1234:4561::0/64'
> => #<IPAddr: IPv6:2002:0000:1234:4561:0000:0000:0000:0000/ffff:ffff:ffff:ffff:0000:0000:0000:0000>
>
> The "::" means "add as many :0000:'s as necessary to make up to 128 bits".
> But you could also use a valid 128 bit address explicitly:
>
> irb(main):005:0> IPAddr.new '2002:0000:1234:4561:0000:0000:0000:0000'
> => #<IPAddr: IPv6:2002:0000:1234:4561:0000:0000:0000:0000/ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff>
>
> > IPAddr think my IP like an invalid adress because it hadn't a name
> > resolution. The line who raise the exception is :
> >
> >   IPSocket.getaddress(prefix)
> >
> > For me, the prefix is '2002:0000:1234:4561', because it's never modify
> > before in intialize of IPAddr (Verify with the debuggeur). The command
> > follow prouve it :
> >
> >   hello% host 2002:0000:1234:4561
> >   Host 2002:0000:1234:4561 not found: 3(NXDOMAIN)
>
> If you give an address which is not syntactially valid as an IPv6 numeric
> address, I guess it's reasonable for Ruby to try it as a hostname instead.
>

Ok, thanks for your answer. I don't know enough the specification of
Ipv6. I thought that this adress was valid.


-- 
Cyril Mougel