Re: "Programmers can't get IPv6 thus that is why they do not have IPv6 in their applications"....

[Ingo Flaschberger <if () xip at>]

Am 28.11.2012 19:30, schrieb david peahi:
> Many years ago the standard books on application network programming were
> based on C language. Books such as "Adventures in UNIX Network
> Programming", and Professor Comer's "Internetworking with TCP/IP Vol 3"
> detailed how to write C programs using BSD sockets where binding to a
> socket brought the program up in listening mode on an 2 tuple IP v4 IP
> address/TCP well known port. Once the program opened and bound to a socket
> "netstat -n" would show that program to be "listening" on the 2-tuple.
>
> Do today's programmers still use basic BSD socket programming? Is there an
> equivalent set of called procedures for IPv6 network application
> programming?
>
> On the practical side: Have all programmers created a 128 bit field to
> store the IPv6 address, where IPv4 programs use a 32 bit field to store the
> IP address? This would seem to be similar to the year 2000 case where
> almost all programs required auditing to see if they took into account
> dates after 1999.

on linux/unix: if the program only opens a tcp-connection or listen on 
it, it's simple.
socket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP) -> socket = 
socket(AF_INET6, SOCK_STREAM, IPPROTO_TCP)

It's more work, to build a dual-stack program - then 2 sockets needs to 
be opened and handled.
But overall - it's trivial.

y2k: the will be app's that will it never made to ipv6 - but you can do 
ipv6->ipv4 translation NAT-PT (RFC2766)

Kind regards,
     Ingo Flaschberger