The reason can be found in
http://man7.org/linux/man-pages/man7/ipv6.7.html
IPV6_V6ONLY (since Linux 2.4.21 and 2.6)
If this flag is set to true (nonzero), then the socket is re
‐
stricted to sending and receiving IPv6 packets only. In
this
case, an IPv4 and an IPv6 application can bind to a single
port at the same time.
If this flag is set to false (zero), then the socket can be
used to send and receive packets to and from an IPv6 address
or an IPv4-mapped IPv6 address.
The argument is a pointer to a boolean value in an integer.
The default value for this flag is defined by the contents
of
the file /proc/sys/net/ipv6/bindv6only. The default value
for
that file is 0 (false).
IO::Socket::IP forces 1 for IPV6_V6ONLY, if any of AF_INET6 or PF_INET6 is
defined for the socket domain/family and IPV6_V6ONLY can be set (override
the OS system default).
IO::Socket::INET6 does not touch the IPV6_V6ONLY flag , which forces the
usage of the OS level setting.
The overall recommendation is to use the system default - so
IO::Socket::INET6 does nothing wrong.
Binding to the universal IPv6 [::] with disabled IPV6_V6ONLY, enables
IPv6 and IPv4 connection at this listener - binding IPv4 explicit to
0.0.0.0 to the same port after this, will fail.
The next release of assp V2 will take care of the system setting of
IPV6_V6ONLY for security reasons. If this system flag is set to 1, nothing
is changed. If this system flag is set to zero, assp will try to switch it
to 1 for each defined universal IPv6 listener. How ever, a system can be
build in a way, that does not allow to change this flag any way - so the
system default will take place.
Thomas
Von: "William L. Thomson Jr." <[email protected]>
An: [email protected]
Datum: 27.06.2015 17:24
Betreff: Re: [Assp-user] Unable to log into web admin interface
On Saturday, June 27, 2015 04:57:15 PM Thomas Eckardt wrote:
> The running PP (pure perl) code is on all OS the same. It works on any
> BSD, MSWIN, OS/2, OS/400, OSX ....
> If it does not work, bind to specific IP's.
Its not the same on all OS, I would assume it can properly bind to IPv4
and IPv6
wildcards on other OS other than Linux. Then again it should be consistent
for any
Posix platform, providing the module is coded to Posix and not specific
*nix variants.
> >it confuses itself and generates the error "Address already in use".
>
> This is an OS error - from the C-LIB!
NO its from how the library is being used.... The OS raises an error
because of the
code, change the code and it will work like other things. Again an issue
in the
IO::Socket::INET6 modules code, but you still do not want to admit or
believe such.
Despite all the facts and proof.
Again do the same thing with Perl 5.14 IO::Socket::IP and see the
difference for
yourself. Then you can see how the different Perl modules
operate/function
differently on the same OS, using the same libraries...
--
William L. Thomson Jr.
Obsidian-Studios, Inc.
http://www.obsidian-studios.com
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