Re: [lwip-users] How to have two different sockets for IPv4 and IPv6

[Ivan Delamer]

I don't use the socket API but as far as I can remember, all you need 
is one socket listening on IPv6 ANY address. This will accept IPv4 
connections as well by default. It can also be disabled.

If there is no predefined sin6 address for ANY, your procedure of 
setting it to 0 is correct.

Somebody about a year or two ago had made sure this was working. Is it 
not working for you?

Cheers
Ivan



> Date: Wed, 8 Apr 2015 06:15:08 -0700 (MST)
> From: Mohsin <address@hidden>
> To: address@hidden
> Subject: [lwip-users] How to have two different sockets for IPv4 and
>         IPv6
> Message-ID: <address@hidden>
> Content-Type: text/plain; charset=us-ascii
>
> Hi,
>
> I am trying to write a web server that listens on both IPv4 and IPv6
> addresses. Although, only one implementation at a time works fine. 
> However,
> the code that I wrote for both simulateniously doesn't work. I mean 
> I'm
> creating two diff webserver tasks for IPv4 and IPv6. The socket for 
> both
> AF_INET6 and AF_INET and binding it with port=80 which is as follows:
>
> //webserver_task_IPv4
> iStatus = socket( AF_INET, SOCK_STREAM, 0 );
> sin.sin_family = AF_INET;
> sin.sin_len = sizeof(sin);
> sin.sin_addr.s_addr = htonl(INADDR_ANY);
> sin.sin_port = HTTP_PORT_NUMBER;               //port = 80
> memset(&(sin.sin_zero), '\0', sizeof(sin.sin_zero));
>
> //webserver_task_IPv6
> iStatus = socket( AF_INET6, SOCK_STREAM, 0 );
> sin.sin6_family = AF_INET6;
> sin.sin6_len = sizeof(sin);
> memset(&(sin.sin6_addr), 0, sizeof(sin.sin6_addr));
> sin.sin6_port = HTTP_PORT_NUMBER;               //port = 80
>
>
> Actually I'm looking for "in6addr_any" for filling IPv6 ANY Address 
> into
> IPv6 socket case but can't find anywhere in the stack and hence used
> memset() to set sin6_addr to 0. So is there any replacement variable 
> defined
> for it in the stack?
>
> Both above tasks works fine when implemented one at a time.
>
> Can anyone please suggest proper socket binding that can listen for 
> both
> IPv4 and IPv6 at the same time.
>
> Any help would be highly appreciated.
>
> Thanks & regards,
> Mohsin Kesarani