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Altera_Forum
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15 years ago

How do Nios-II handle IP address change during the TCP/IP connection?

Dear all, I have problem with changing IP address in the FPGA board. Here is my case, let say I have a FPGA board which is connected to PC. The PC sends a command to the FPGA that asks th...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

Hi Jakobjones!

I've checked the "set_ipaddr()" function and "alt_iniche_dev.c", then I made my own function to change the ip address. Here is the code : 


int change_ip (int	dhcp_actv)
{
	alt_iniche_dev  *p_dev;
	NET	       p_net;
	ip_addr    ipaddr, netmask, gw;
	NetInfo     new_ip;
	new_ip.ipaddr_in = 192;
	new_ip.ipaddr_in = 168;
	new_ip.ipaddr_in = 1;
	new_ip.ipaddr_in = 3;
	new_ip.netmask_in = 255;
	new_ip.netmask_in = 255;
	new_ip.netmask_in = 255;
	new_ip.netmask_in = 0;
	new_ip.gw_in = 192;
	new_ip.gw_in = 168;
	new_ip.gw_in = 1;
	new_ip.gw_in = 1;
        p_dev -> p_net = nets;
	// Get the new ip address
	printf(" Get the new ip address\n");
	if(dhcp_actv) p_net -> n_flags |= NF_DHCPC;
	else
	{
		IP4_ADDR( ipaddr, new_ip.ipaddr_in, new_ip.ipaddr_in, new_ip.ipaddr_in, new_ip.ipaddr_in );
		IP4_ADDR( netmask, new_ip.netmask_in, new_ip.netmask_in, new_ip.netmask_in, new_ip.netmask_in );
		IP4_ADDR( gw, new_ip.gw_in, new_ip.gw_in, new_ip.gw_in, new_ip.gw_in );
		p_net -> n_ipaddr = ipaddr;
		p_net -> snmask   = netmask;
		p_net -> n_defgw  = gw;
	}
	return 0;
}

There was no error either during the compilation or after the program execution, but the Nios' IP address didn't change (I've checked it by ping the Nios from my pc). It still used the old IP address.

Do you know what's wrong with my code? I'm thinking that I need to reset the NicheStack or force the NicheStack to read the new assigned IP address. But I don't know how to do that. Hopefully you can help me..

Thanks before.