// Later, we add IP addresses.
    NS_LOG_INFO ("Assignings IP Addresses.");
    Ipv4AddressHelper ipv4_n;
    //ipv4_n.SetBase ("10.1.0.0", "255.255.0.0");

    NS_LOG_INFO ("Create Links Between Nodes");
    uint32_t linkCount = 0;

    Ipv4InterfaceContainer n_ic[nodes.GetN()][nodes.GetN()];

    for (size_t i = 0; i < nodes.GetN(); i++)
    {
        for (size_t j = 0; j < nodes.GetN(); j++)
        {
            if (NICM[i][j][2] != -1)
            {
                NodeContainer n_links = NodeContainer (nodes.Get (i), nodes.Get (j));
                NetDeviceContainer n_devs = p2phelper.Install (n_links);
                    char * cstr;
                    std::stringstream ss;
                    ss << "10.1." << 1+j << ".0";
                    cstr = new char [ss.str().size()+1];
                    strcpy(cstr, ss.str().c_str());
                    ipv4_n.SetBase(cstr, "255.255.255.0");
                n_ic[i][j] = ipv4_n.Assign (n_devs);
                ipv4_n.NewNetwork ();
                linkCount++;
                NS_LOG_INFO ("matrix element [" << i << "][" << j << "] is " << NICM[i][j][2]);
            }
            else
            {
            NS_LOG_INFO ("matrix element [" << i << "][" << j << "] is -1");
            }
        }

    }