Re: [lwip-users] DHCP OK but TCP not? (Chen)

Pomeroy, Marty Fri, 21 Sep 2012 08:27:36 -0700

 
I honestly don't know if this is an issue, but on 1.4.0, my startup also
calls tcpip_init as below:
 
   g_EmacSetMacFromRegs( (char *)&m_NetIF.hwaddr); // init MAC address
from the hardware
   IP4_ADDR(&eth0gw, 192,168,0,1);
   IP4_ADDR(&eth0ipaddr, 0,0,0,0);  // for DHCP, start with this IP 
   IP4_ADDR(&eth0netmask, 255,255,255,0);
 
   tcpip_init( NULL, NULL);
 
   netif_add( &m_NetIF, &eth0ipaddr, &eth0netmask, &eth0gw, NULL,
ethernetif_init, tcpip_input);
 
   dhcp_start( &m_NetIF)
     ...


After DHCP completes, try ping it from a computer on the subnet.
 
HTH!
 
Marty
 


________________________________

From: [email protected]
[mailto:[email protected]] On
Behalf Of Chen
Sent: Thursday, September 20, 2012 3:54 PM
To: [email protected]
Subject: [lwip-users] DHCP OK but TCP not? (Chen)


        Bad news, DHCP got the IP assigned, but I can't connect to it
via TCP 
        anymore (UDP works fine), and the only difference in codes are
        
            if (DHCP){
                 //This gets the IP, but I can't open via TCP
                    IP4_ADDR( &xIpAddr,0,0,0,0 );
                    IP4_ADDR( &xNetMask,255,255,255,0 );
                    IP4_ADDR( &xGateway,0,0,0,0 );
                    netif_add( &MACB_if, &xIpAddr, &xNetMask, &xGateway,

        NULL, ethernetif_init, tcpip_input );
        
                    netif_set_default( &MACB_if );
        
                    dhcp_start(&MACB_if);
            }
            else{
                 //This works perfectly
                    IP4_ADDR( &xIpAddr,myIP[0],myIP[1],myIP[2],myIP[3]);
                    IP4_ADDR( &xNetMask,255,255,255,0 );
                    IP4_ADDR( &xGateway,0,0,0,0 );
                    netif_add( &MACB_if, &xIpAddr, &xNetMask, &xGateway,

        NULL, ethernetif_init, tcpip_input );
        
                    netif_set_default( &MACB_if );
                    netif_set_up( &MACB_if );
            }

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Re: [lwip-users] DHCP OK but TCP not? (Chen)

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