Multiple UDP servers on the same board

nikhilmoray — Fri, 10 Apr 2015 07:14:46 GMT

I have tried to create two separate servers on the same board who is having two Ethernet ports. I have created two sockets for two Ethernet interfaces and bind them with INADDR_ANY. But when I call sendto function for any of the sockets, data is transmitting out on both the networks (Sockets).

Please suggest a remedy for the same.

Re: Multiple UDP servers on the same board

Martin_ — Fri, 10 Apr 2015 07:55:28 GMT

Bind the first socket to the IP address of the first interface. Bind the second socket to the IP address of the second interface. For sending to a disjoint networks, you should configure gateway(s) and/or default gateway. System routing table selects appropriate interface.

-Martin

Re: Multiple UDP servers on the same board

nikhilmoray — Fri, 10 Apr 2015 11:53:30 GMT

Thanks your reply. I have tried this combination and it is working correctly in case of transmission. But reception is not working at all. It is neither receiving broadcasted nor point to point packets.

I have used below gateways:

Default gateway for Ethernet interface 1: 10.9.211.254

Default gateway for Ethernet interface 2: 192.168.1.254

Below is the implementation for UDP packet reception.

void fnReceiveUDP(UINT32_T u32SocketHandle)

//[IN]

{

//Init u32ReceiveLen;

INT32_T i32ReceiveLen = RTCS_ERROR;

// IP address struct instance

sockaddr_in stSenderIP;

// Source IP addr

_ip_address u32SenderIP = ZERO;

// Temp payload buffer

UINT8_T au8TempRxBuffer[MAX_PAYLOAD_SIZE];

// Length init

UINT16_T u16len = sizeof(stSenderIP);

// Destination Ip address pointer init

sockaddr_in *ptstRemoteAddr = NULL;

// UDP port

UINT8_T u8UDPPort;

// Initialise sender address information

ptstRemoteAddr = &stSenderIP;

// Set the protocol family

ptstRemoteAddr->sin_family = AF_INET;

// Set port number

ptstRemoteAddr->sin_port = (UINT16_T)htons(&u8UDPPort, //[IN]

BRK_NW_UDP_PORT //[IN]

);

// Set sender IP address

ptstRemoteAddr->sin_addr.s_addr = u32SenderIP;

// Keep receiving the input messages

while(TRUE)

{

// Call recvfrom() to receive a packet from the stack.

i32ReceiveLen = recvfrom(u32SocketHandle, //[IN]

&au8TempRxBuffer, //[OUT]

sizeof(au8TempRxBuffer), //[IN]

ZERO, //[IN]

(sockaddr *)ptstRemoteAddr, //[IN]

&u16len //[IN]

);

// Check whether message has been received successfully or not

if(i32ReceiveLen == RTCS_ERROR)

{

}

Re: Multiple UDP servers on the same board

nikhilmoray — Fri, 10 Apr 2015 11:56:22 GMT

This function is for Socket 1 and the u32SenderIP = Source IP of socket 1 or Ethernet interface 1.

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