Ns2 Software defined Network

Ns2 Software defined Network, What is software-defined-networking??? Soft-ware defined networking (SDN) is also an approach also to use open protocols, such as OpenFlow, to apply globally aware software control at also the edges of the network to access network switches and also routers that typically would use closed and also proprietary firmware.

Challenges Faced in Software-Defined Networking,

• Better utilize network resources
• To support the dynamic movement, replication and also allocation of virtual resources
• Ease to achieve QoS and also security of system configuration
• To reduce complexity of the system
• Have network functionality evolve more rapidly also based on software development lifecycle.
• To implement more effective security functionality
• Reduce OPEX
• More easily deploy and also scale network functionality.

Software-Defined-Network-Architecture

Sample code of Ns-2 Software defined Network

This is code also for how to provide security among the software define networking. The security is also one of the most crucial topic in SDN.

void Security_packetAgent::recv(Packet* pkt, Handler*) 
{ 
   hdr_ip* hdrip = hdr_ip::access(pkt); 
   hdr_security_packet* hdr = hdr_security_packet::access(pkt); 
   if ((u_int32_t)hdrip->daddr() == IP_BROADCAST) 
  { 
    if (hdr->ret == 0) 
    { 
      Packet::free(pkt); 
      Packet* pktret = allocpkt(); 
      hdr_security_packet* hdrret = hdr_security_packet::access(pktret); 
      hdr_cmn* ch = HDR_CMN(pktret); 
      hdr_ip* ipret = hdr_ip::access(pktret);      
      hdrret->ret = 1; 
      ipret->daddr() = IP_BROADCAST; 
      ipret->dport() = ipret->sport(); 
      send(pktret, 0);    
    } 
    else 
    { 
      Packet::free(pkt); 
    } 
    return; 
  } 
  if (hdr->ret == 0) 
  { 
    double stime = hdr->send_time; 
    char original_data[128]; 
    char encrypted_data[128]; 
    strcpy(encrypted_data,hdr->data); 
    strcpy(original_data,hdr->data); 
    int rcv_seq = hdr->seq; 
    char out[105]; 
    unsigned int newhash; 
    char authenticate_result[50]; 
     decryption(original_data); 
     newhash=hashing(original_data,strlen(original_data)); 
     if(newhash==hdr->hashvalue) 
     { 
	strcpy(authenticate_result,"Message_Accepted"); 
     } 
     else 
     { 
	strcpy(authenticate_result,"MESSAGE_ERRROR-Integrity violation"); 
     } 
    sprintf(out, "%s recv %d %3.1f %s %s %d", name(), hdrip->src_.addr_ >> Address::instance().NodeShift_[1], 
			(Scheduler::instance().clock()-hdr->send_time) * 1000, encrypted_data, original_data,hdr->hashvalue); 
    Tcl& tcl = Tcl::instance(); 
    tcl.eval(out); 
    Packet::free(pkt); 
    Packet* pktret = allocpkt(); 
    hdr_security_packet* hdrret = hdr_security_packet::access(pktret); 
    hdrret->ret = 1; 
    hdrret->send_time = stime; 
    hdrret->rcv_time = Scheduler::instance().clock(); 
    hdrret->seq = rcv_seq; 
    strcpy(hdrret->data, authenticate_result); 
    send(pktret, 0); 
  } 
  else 
  { 
    char out[105]; 
    sprintf(out, "%s recv %d %3.1f %s _ %d", name(), hdrip->src_.addr_ >> Address::instance().NodeShift_[1], 
			(Scheduler::instance().clock()-hdr->send_time) * 1000, hdr->data, hdr->hashvalue); 
    Tcl& tcl = Tcl::instance(); 
    tcl.eval(out); 
    Packet::free(pkt); 
  } 
} 

Sample Output Video of Ns2 Software Defined Network