IPv6 Sockets

nitin1704 has asked for the wisdom of the Perl Monks concerning the following question:

I have two scripts for sending out UDP packets to IPv4 and IPv6 sockets, using IO::Socket::INET and INET6 respectively.

IPv4 Client

use IO::Socket;
use Socket;

my $sock = IO::Socket::INET->new(
    Proto    => 'udp',
) or die "Could not create socket: $!\n";

my $pack = pack_sockaddr_in(23456, inet_aton('10.254.83.40'));

IO::Socket::send($sock, "message", 0, $pack) or die "Can't send: $!\n"
+;

print $sock->sockhost(),"\n";
print $sock->sockport(),"\n";
print $sock->peerhost(),"\n";
print $sock->peerport(),"\n";
[download]

IPv6 Client

use IO::Socket::INET6;
use Socket;
use Socket6;

my $sock = IO::Socket::INET6->new(
    Proto    => 'udp',
) or die "Could not create socket: $!\n";

my $pack = pack_sockaddr_in6(23456, inet_pton(AF_INET6,'2000:1234:5678
+:9abc::eeff'));

IO::Socket::send($sock, "message", 0, $pack) or die "Can't send: $!\n"
+;

print $sock->sockhost(),"\n";
print $sock->sockport(),"\n";
print $sock->peerhost(),"\n";
print $sock->peerport(),"\n";
[download]

IPv4 Output

0.0.0.0
32807
10.254.83.40
23456
[download]

IPv6 Output

::
-4622771466457284569
2000:1234:5678:9abc::eeff
-4622771466457293920
[download]

Question

I can't figure out why INET6 sockets are printing such weird values for the port numbers, even though I'm using the same 23456 in both cases.

Comment on IPv6 Sockets Select or Download Code

Replies are listed 'Best First'.
Re: IPv6 Sockets by quester (Vicar) on Dec 10, 2012 at 08:06 UTC
It works for me... my IPv6 output is: `:: 49527 2000:1234:5678:9abc::eeff 23456` [download] You might want to check for an outdated module (or perl, or operating system). I'm using: `perl 5.14.3 Fedora 17 Linux, kernel 3.6.9 IO::Socket::INET6 2.69 IO::Socket 1.32 Socket 2.001 Socket6 0.23` [download]	[reply] [d/l] [select]
Re^2: IPv6 Sockets by nitin1704 (Sexton) on Dec 10, 2012 at 09:10 UTC
I was trying it from a CentOS 5 VirtualBox VM. But then I tried from real Windows and Ubuntu machines and it worked just fine. Probably the VM has something to do with it?	[reply]
Re: IPv6 Sockets by Anonymous Monk on Dec 10, 2012 at 04:25 UTC
I can't figure out why INET6 sockets are printing such weird values for the port numbers, even though I'm using the same 23456 in both cases. Did you read the docs? Probably cause they're supposed to do that, cause they're documented to do that. :P If IO::Socket::INET6 isn't satisfying try reading RFC 3493 - Basic Socket Interface Extensions for IPv6	[reply]
Re^2: IPv6 Sockets by nitin1704 (Sexton) on Dec 10, 2012 at 04:46 UTC
I can't seem to find this particular issue documented in any of those pages. :/ In any case, is there any way I can get the actual port number?	[reply]
Re^3: IPv6 Sockets by Anonymous Monk on Dec 10, 2012 at 05:29 UTC
I can't seem to find this particular issue documented in any of those pages. :/ In any case, is there any way I can get the actual port number? Hmm, I don't know what I was looking at :/ ignore me	[reply]


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