DNS Server with IPv6 support Post: 302123704

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Special Forums IP Networking DNS Server with IPv6 support Post 302123704 by porter on Tuesday 26th of June 2007 07:56:01 PM

06-26-2007

Registered User

Different platforms have different solutions on implementing both IPv4 and IPv6 simultaneously, and this affects how servers listen.

There is the parallel stack and the unified stack approach.

With the parallel stack approach, IPv4 and IPv6 are totally independent stacks and port 53 TCP/IPv4 is different to port 53 TPC/IPv6. A server has to bind and listen on both these ports.

With the unified stack approach the following happens:

If you create an IPv4 socket, it only works on IPv4, end of story.

If you create an IPv6 socket, it will work with both IPv4 and IPv6 clients.

Then there are platforms which require you to create both an IPv4 and an IPv6 socket, but the ports are common, hence you have to set the SO_REUSEADDR flag in order to bind both IPv4 and IPv6 to the same port.

The address "loopback" will resolve typically to 127.0.0.1 which is the IPv4 loopback address. As you point out "::1" is the loopback for IPv6.

porter

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LEARN ABOUT CENTOS

rping

RPING(1)							     librdmacm								  RPING(1)

NAME

       rping - RDMA CM connection and RDMA ping-pong test.

SYNOPSIS

       rping -s [-v] [-V] [-d] [-P] [-a address] [-p port]
		 [-C message_count] [-S message_size]
       rping -c [-v] [-V] [-d] -a address [-p port]
		 [-C message_count] [-S message_size]

DESCRIPTION

       Establishes  a  reliable  RDMA connection between two nodes using the librdmacm, optionally performs RDMA transfers between the nodes, then
       disconnects.

OPTIONS

       -s     Run as the server.

       -c     Run as the client.

       -a address
	      On the server, specifies the network address to bind the connection to.  On the client, specifies the server address to connect to.

       -p     Port number for listening server.

       -v     Display ping data.

       -V     Validate ping data.

       -d     Display debug information.

       -C message_count
	      The number of messages to transfer over each connection.	(default infinite)

       -S message_size
	      The size of each message transferred, in bytes.  (default 100)

       -P     Run the server in persistent mode.  This allows multiple rping clients to connect to a single server instance. The server  will  run
	      until killed.

NOTES

       Because	this  test maps RDMA resources to userspace, users must ensure that they have available system resources and permissions.  See the
       libibverbs README file for additional details.

SEE ALSO

       rdma_cm(7), ucmatose(1), udaddy(1), mckey(1)

librdmacm							    2007-05-15								  RPING(1)