RE : [lwip-users] using 2 IP numbers at the same time

Hello,

I am pretty new in using lwip and want to ask your recommendations on an issue about using 2 IP numbers at the same time.

Let me describe my design first:

I am working on an Xilinx ML-403 platform and writing code for PPC inside the FGPGA. I have an ethernet interface for communication and using LwIP(LwIP 2.00.a version) for it.

Also using Xilinx MicroKernel.

Simply my application will have a static IP number and will communicate with another system which has a static IP number too.

But now another requirement has been arised. That is my application must communicate with a second system from an another IP number. And I still have one physical ethernet port.

This means that my application must have 2 IP numbers. And it must listen both connections at the same time.

From mail group , I read that this is possible with creating seperate network interfaces with netif_add function.

In my design , I thought of creating two threads which will establish two sockets and add seperate network interfaces at the same time.

But it didn`t work. While I could communicate with one IP number , the other connection could not be established.

Here is my thread that I use for creating socket:

void *socket_app_thread( void *arg )

{

.....//declarations an initializations IP, port , MAC, subnet, gw

xtemacif_setmac( 0, ( u8_t* )fullmac ); //Set MAC

IP4_ADDR( &gw, gateway[ 0 ], gateway[ 1 ], gateway[ 2 ], gateway[ 3 ] );

//Set gateway

IP4_ADDR( &ipaddr, ip[ 0 ], ip[ 1 ], ip[ 2 ], ip[ 3 ] ); //Set ip

IP4_ADDR( &netmask, subnet[ 0 ], subnet[ 1 ], subnet[ 2 ], subnet[ 3 ] );

//Set subnet msk

/* allocate netif structure */

default_netif = mem_malloc( sizeof( struct netif ) );

if ( default_netif == NULL )

{

return NULL;

}

default_netif = netif_add( default_netif,

&ipaddr,

&netmask,

NULL,

&XTemacIf_ConfigTable[ 0 ],

xtemacif_init,

tcpip_input );

netif_set_default( default_netif );

/* Register XEmacHandler with interrupt controller and enable interrupts

* with XMK

register_int_handler( XPAR_OPB_INTC_0_TRIMODE_MAC_GMII_IP2INTC_IRPT_INTR,

(XInterruptHandler )XTemac_IntrFifoHandler,

xtemacif_ptr->instance_ptr );

/* Enable EMAC interrupts in XMK */

enable_interrupt( XPAR_OPB_INTC_0_TRIMODE_MAC_GMII_IP2INTC_IRPT_INTR );

/*-----------------------------------------------------------------------*/

/* create socket and start application */

/*-----------------------------------------------------------------------*/

sock = socket( AF_INET, SOCK_STREAM, 0 );

addr.sin_family = AF_INET;

addr.sin_port = htons( port );

addr.sin_addr.s_addr = INADDR_ANY;

bind( sock, ( struct sockaddr* ) &addr, sizeof( addr ) );

listen( sock, 7);

SockDesc = accept( sock, ( struct sockaddr* ) &rem, &lensock );

}

The second thread is similar with this one, only IP and port number is different.

Do you have any idea where I am having mistakes?

I really appreciate for your help.

Thanks in advance.

Koray.

From:	Frédéric BERNON
Subject:	RE : [lwip-users] using 2 IP numbers at the same time
Date:	Wed, 7 Nov 2007 12:20:09 +0100