stand-alone lwip ARP problem

[Altera_Forum]

Dear all ! 

 I have downloaded stand-alone lwip from our forum "Test IP" .My design is to build a simple udp-client that sending data to PC with stand-alone lwip .But this version seems too old (version 0.7.1,developped on 2005 ,now the lastest version is 1.3.0)I guess MAYBE there is a bug in ARP modle ,here is the problem i hit&#65306;  If i run my application, it does not send any UDP packets ( see that in Ethereal ). However ,after runing anther application udp_echo (data send and return ) ,stop it and run my application ,my app runs very well .I &#39;m very confused !  So i guess MAYBE there is a bug in our stand-alone lwip .Here is my reason.  when i run the UDP_ECHO app, PC send a udp packet to board ,so our board konw the IP address and MAC addess of PC ,and update it to ARP cache . Then run my app ,the app konws the destination host &#39; IP address and MAC addess (PC),so it works well. If i run my app only ,it does not konw the PC &#39;s MAC addess , therefore it work fail.Though PC send gratuitous arps ,but the lwip can&#39;t update it to the ARP cache .  Am i right ? And how to resolve it ?  Is there someone work similar with me ? or could send a simple udp-client example (stand-alone lwip version) to me ! Thank you ! My MSN and my email is the_gadfly@163.com ----------my app------------- ... ... P4_ADDR(&udpDestIpAddr, 10, 1 ,1, 52); p = pbuf_alloc(PBUF_TRANSPORT,sizeof(Test),PBUF_RAM); memcpy(p->payload, Test, sizeof(Test)); pcb = udp_new();  udp_bind(pcb, IP_ADDR_ANY, 60000);  udp_connect(pcb, &udpDestIpAddr, 60000);    for(i=0;i<1000;i++) { udp_send(pcb,p); }   pbuf_free(p); udp_remove(pcb);  --------udp_echo app------------  void udp_echo_recv(void *arg, struct udp_pcb *pcb, struct pbuf *p, struct ip_addr *addr, u16_t port)  { struct ip_addr ipaddr;  IP4_ADDR(&ipaddr,10,1,1,52);  if (p != NULL)  {   udp_connect(pcb,&ipaddr,60000);  udp_send(pcb, p);     pbuf_free(p);   }  }     void udp_echo_init(void)  {   struct udp_pcb * pcb;   pcb = udp_new();   udp_bind(pcb, IP_ADDR_ANY, 60000) ;  udp_recv(pcb, udp_echo_recv, NULL);    }  -------------------------------------------  Best regards  the_gadfly   

[Apara]

Hi,

I too want to implement the lwip with DE2-115 FPGA , But I am facing difficulty in  spoc builder component connections.As I am new Altera I tried  with basic Ethernet design based on below link.

https://www.intel.com/content/www/us/en/programmable/support/support-resources/design-examples/intellectual-property/embedded/nios-ii/exm-net-std-de.html?elq_cid=5141484_ts1621585352433&erpm_id=2899670_ts1621585352433

When I adding these component and additional peripheral as suggest in message , I unable connect these.

I am confuse what should  the component, its value and how to connect with others.Please guide little