[erlang-patches] [PATCH] epmd: support IPv6 node registration

Michael Santos <>
Fri May 3 15:27:50 CEST 2013


On Wed, Feb 20, 2013 at 07:55:17AM -0500, Michael Santos wrote:
> Allow IPv6 nodes to register with and query epmd. On systems with
> IPv6 support:
> 
> * epmd listens on both the IPv4 and IPv6 ANY or loopback sockets
> 
> * the epmd cli client connects to epmd over the IPv6 loopback
> 
> * distributed nodes started with "-proto_dist inet6_tcp" will register
>   with epmd over IPv6
> 
> The interaction between IPv4 and IPv6 sockets depends on the platform:
> 
> * FreeBSD allows multiple "specific" sockets to bind the same port (such
>   as 2 sockets listening to the same port on ANY and the loopback).
>   Binding port 4369 to IPv4 and IPv6 sockets simulataneously is allowed.
> 
> * Linux does not allow the same port to be bound by different sockets.
>   Setting the IPV6_V6ONLY socket option is required.
> 
> * Windows
> 
>   The behaviour differs depending on the version of Windows:
> 
>   http://msdn.microsoft.com/en-us/library/windows/desktop/bb513665(v=vs.85).aspx
> 
>   According to the site, sockets on Windows XP with Service Pack 1 (SP1)
>   and Windows Server 2003 will only listen on either IPv4 or IPv6, so
>   creating two sockets is required to service IPv4 and IPv6 traffic on
>   the same port. The IPV6_V6ONLY socket option is not supported.
> 
>   For Windows Vista and later, a single socket can handle IPv4 and IPv6
>   traffic for the same port. The IPV6_V6ONLY socket option is supported
>   and is enabled for IPv6 sockets by default.
> ---
>  erts/doc/src/epmd.xml             |    2 +-
>  erts/doc/src/erl.xml              |   22 +++++
>  erts/epmd/src/epmd.c              |    6 +-
>  erts/epmd/src/epmd_cli.c          |   11 ++-
>  erts/epmd/src/epmd_int.h          |   63 +++++++++----
>  erts/epmd/src/epmd_srv.c          |  184 +++++++++++++++++++++++++------------
>  erts/epmd/test/epmd_SUITE.erl     |   33 ++++++-
>  lib/kernel/src/erl_epmd.erl       |   18 ++--
>  lib/kernel/src/inet6_tcp_dist.erl |    2 +-
>  9 files changed, 248 insertions(+), 93 deletions(-)

ping!


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