Get node ID from MAC48Address without global variables

[Francisco Eduardo Balart Sanchez]

Good day:

I´m trying to simulate a MANET 

so far i have been able to retrieve by callbacks the MAC48address of the source node that sends packets

as well as retrieve the RSS 

One thing to mention, i only install the wifiMac and wifiPhy making at the end a wifinetdevice, meaning i´m not using Ipv4 or further classes which are used in common simulations, also i don´t use sta or ap mac classes but adhoc 

Since each node must only be able to "operate" with the neighbors information i must acquire the Node ID from a trace callbacks 

the two aforementioned i have used are:

  uint32_t nDevices = devices.GetN ();

  for (uint32_t i = 0;i < nDevices; ++i)

  {

    Ptr<WifiNetDevice> p = DynamicCast<WifiNetDevice> (devices.Get (i)); 

    p->SetAddress(Mac48Address::Allocate ());  

    devices.Get(i)->SetReceiveCallback(MakeCallback(&ReceivePacket));

    p->GetPhy()->TraceConnectWithoutContext ("MonitorSnifferRx", MakeCallback (&ReceivePacketWithRss));

  }

With which i get the MAC48Address of source node and the RSS as well

You can observe that i did not make global trace callbacks but one for each node since again i will work only with local information (that is the essence of my manet project)

Such callbacks are defined in the documentation as follows

void ReceivePacketWithRss (Ptr< const Packet > packet, uint16_t channelFreqMhz, uint16_t channelNumber, uint32_t rate, WifiPreamble preamble,WifiTxVector txVector, struct mpduInfo aMpdu, struct signalNoiseDbm signalNoise)

bool ReceivePacket( Ptr<NetDevice> netdevice, Ptr<const Packet> packet, uint16_t protocol, const Address& sourceAddress)

Now i have been digging in the forums to see if this has been done, but apologizing in advance i haven't seen a clear example

Such threads i have found are shown below:

• https://groups.google.com/forum/#!searchin/ns-3-users/Packet$20To$20node$20Id%7Csort:relevance/ns-3-users/BAxe2ipHWSY/sgkvqg0FAQAJ
• Suggest the mapping, but if is done by global variables is not good to use for me
• https://groups.google.com/forum/#!searchin/ns-3-users/"node$20id"$2Bfrom$20mac|sort:relevance/ns-3-users/9yJKFtQg4Uc/kQQKrZQRCF8J
  
• uses Ipv4.... info which i dont have since my implementation will be at MAC layer so i need to retrieve node id with MAC48Address info
• https://groups.google.com/forum/#!searchin/ns-3-users/Get$20node$27s$20id$20or$20ip$20from$20packet$20or$20mactxqueue%7Csort:relevance/ns-3-users/ujkn0nO92tw/MFi0LzpmYzMJ
  
• Suggest using 
• Ptr<Node> node = this->GetObject<Node>();
• But i haven´t being successful to get the node from the MAC48address
• I tried from different approaches but obviously i´m missing to understand something here
• Also in https://www.nsnam.org/doxygen/classns3_1_1_wifi_mac_header.html#a90d4600f2911842469f6dad74cbd17e0
• I thought of using the wifimac header and use the getaddr1, but i don´t think is the solution since in a broadcast (which is part of the behavior of the MANET, the algorithm i´ll implement will enable Tx with MAC layer decisions) zAddr1-4 
• As tommaso have pointed out in https://groups.google.com/forum/#!searchin/ns-3-users/"node$20id"$2Bfrom$20mac|sort:date/ns-3-users/QkyWKgtagPo/lvEsqg4UAl8J
• Ptr <YansWifiPhy> phy = DynamicCast <YansWifiPhy> (mac->GetWifiPhy());
  if (phy)
    {
      phy->GetDevice->GetObject<Node> ()->GetId ();
    }
• In https://groups.google.com/forum/#!searchin/ns-3-users/"node$20id"$2Bfrom$20mac|sort:date/ns-3-users/320Tl6gp_u0/lvjU-t1t9wkJ
• They use m_ipv4->GetObject<Node>()->GetId() 
• which is not a feature with the MAC48address

So summarizing i would like support either by snippet of code or links to threads of discussions, or classes references to be able to retrieve if is possible

the Source Node ID from the MAC48Address without the need of use of global variables (mapping it) and if possible using the info of one of the callbacks i already have implemented, if i need to implement another callback i have no problem

I apologize in advance if this has been answered already, but i haven´t found the answer yet, or it was not clear to me a newbie in NS3 if it was already there 

Thanks in advance and best regards

Eduardo

[Francisco Eduardo Balart Sanchez]

Good day:

Just following up if there is any update regarding the support for this topic

[Tommaso Pecorella]

Hi Eduardo,

I fear that there's no solution to your problem.

If you use global variables (e.g., the global node list) NodeList::GetNode(i) you can get the nodes pointer, scan it for its interfaces, see if one of them has a matching MacAddress and, in case, retrieve the NodeId.

If you don't use global variables, you can't do that, and there's no foolproof way to find the NodeId from the MAC address.

As a matter of fact, remember that the NodeId is a ns-3 thing. A real system won't care about the NodeId, nodes will be always identified by their MAC address.

In case you want to use a higher level identifier, you'll need a discovery system similar to ARP and/or NDP.

Cheers,

T.

[Francisco Eduardo Balart Sanchez]

Good day:

Thanks for taking the time Tommasso, i think this solves my doubt, right now as you said i´m using global variables but for the communications between nodes its MAC address.

thanks.