1 /* Copyright (c) 2007-2020. The SimGrid Team. All rights reserved. */
3 /* This program is free software; you can redistribute it and/or modify it
4 * under the terms of the license (GNU LGPL) which comes with this package. */
7 #include <unordered_set>
9 #include "xbt/config.hpp"
10 #include "xbt/string.hpp"
11 #include "xbt/utility.hpp"
13 #include <ns3/core-module.h>
14 #include <ns3/csma-helper.h>
15 #include <ns3/global-route-manager.h>
16 #include <ns3/internet-stack-helper.h>
17 #include <ns3/ipv4-address-helper.h>
18 #include <ns3/packet-sink-helper.h>
19 #include <ns3/point-to-point-helper.h>
20 #include <ns3/application-container.h>
21 #include <ns3/event-id.h>
23 #include "ns3/wifi-module.h"
24 #include "ns3/mobility-module.h"
26 #include "network_ns3.hpp"
27 #include "ns3/ns3_simulator.hpp"
29 #include "simgrid/kernel/routing/NetPoint.hpp"
30 #include "simgrid/plugins/energy.h"
31 #include "simgrid/s4u/Engine.hpp"
32 #include "simgrid/s4u/NetZone.hpp"
33 #include "src/instr/instr_private.hpp" // TRACE_is_enabled(). FIXME: remove by subscribing tracing to the surf signals
34 #include "src/surf/surf_interface.hpp"
35 #include "src/surf/xml/platf_private.hpp"
36 #include "surf/surf.hpp"
38 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(ns3, surf, "Logging specific to the SURF network ns-3 module");
40 std::vector<std::string> IPV4addr;
46 extern std::map<std::string, SgFlow*> flow_from_sock;
47 extern std::map<std::string, ns3::ApplicationContainer> sink_from_sock;
49 static ns3::InternetStackHelper stack;
50 static ns3::NodeContainer nodes;
51 static ns3::NodeContainer Cluster_nodes;
52 static ns3::Ipv4InterfaceContainer interfaces;
55 static ns3::WifiHelper wifi;
56 static ns3::YansWifiPhyHelper wifiPhy = ns3::YansWifiPhyHelper::Default ();
57 static ns3::YansWifiChannelHelper wifiChannel = ns3::YansWifiChannelHelper::Default ();
58 static ns3::WifiMacHelper wifiMac;
59 static ns3::MobilityHelper mobility;
60 static int mobility_delta = 10;
61 static int mobility_base = 0;
63 static int number_of_nodes = 0;
64 static int number_of_clusters_nodes = 0;
65 static int number_of_links = 1;
66 static int number_of_networks = 1;
68 simgrid::xbt::Extension<simgrid::kernel::routing::NetPoint, NetPointNs3> NetPointNs3::EXTENSION_ID;
70 NetPointNs3::NetPointNs3() : ns3_node_(ns3::CreateObject<ns3::Node>(0))
72 XBT_INFO("NetPointNs3");
73 stack.Install(ns3_node_);
75 node_num = number_of_nodes++;
82 static void clusterCreation_cb(simgrid::kernel::routing::ClusterCreationArgs const& cluster)
84 for (int const& i : *cluster.radicals) {
85 // Routers don't create a router on the other end of the private link by themselves.
86 // We just need this router to be given an ID so we create a temporary NetPointNS3 so that it gets one
87 auto* host_dst = new NetPointNs3();
89 // Create private link
90 std::string host_id = cluster.prefix + std::to_string(i) + cluster.suffix;
91 auto* host_src = simgrid::s4u::Host::by_name(host_id)->get_netpoint()->extension<NetPointNs3>();
92 xbt_assert(host_src, "Cannot find a ns-3 host of name %s", host_id.c_str());
94 // Any ns-3 route is symmetrical
95 ns3_add_direct_route(host_src, host_dst, cluster.bw, cluster.lat, cluster.sharing_policy);
100 //Create link backbone
101 ns3_add_cluster(cluster.id.c_str(), cluster.bb_bw, cluster.bb_lat);
104 static void routeCreation_cb(bool symmetrical, simgrid::kernel::routing::NetPoint* src,
105 simgrid::kernel::routing::NetPoint* dst, simgrid::kernel::routing::NetPoint* /*gw_src*/,
106 simgrid::kernel::routing::NetPoint* /*gw_dst*/,
107 std::vector<simgrid::kernel::resource::LinkImpl*> const& link_list)
109 XBT_INFO("ROUTE_CREATION");
110 if (link_list.size() == 1) {
111 auto* link = static_cast<simgrid::kernel::resource::LinkNS3*>(link_list[0]);
113 XBT_DEBUG("Route from '%s' to '%s' with link '%s' %s %s", src->get_cname(), dst->get_cname(), link->get_cname(),
114 (link->get_sharing_policy() == simgrid::s4u::Link::SharingPolicy::WIFI ? "(wifi)" : "(wired)"),
115 (symmetrical ? "(symmetrical)" : "(not symmetrical)"));
117 // XBT_DEBUG("src (%s), dst (%s), src_id = %d, dst_id = %d",src,dst, src_id, dst_id);
118 XBT_DEBUG("\tLink (%s) bw:%fbps lat:%fs", link->get_cname(), link->get_bandwidth(), link->get_latency());
121 auto* host_src = src->extension<NetPointNs3>();
122 auto* host_dst = dst->extension<NetPointNs3>();
124 xbt_assert(host_src != nullptr, "Network element %s does not seem to be ns-3-ready", src->get_cname());
125 xbt_assert(host_dst != nullptr, "Network element %s does not seem to be ns-3-ready", dst->get_cname());
127 ns3_add_direct_route(host_src, host_dst, link->get_bandwidth(), link->get_latency(), link->get_sharing_policy());
129 static bool warned_about_long_routes = false;
131 if (not warned_about_long_routes)
132 XBT_WARN("Ignoring a route between %s and %s of length %zu: Only routes of length 1 are considered with ns-3.\n"
133 "WARNING: You can ignore this warning if your hosts can still communicate when only considering routes "
135 "WARNING: Remove long routes to avoid this harmless message; subsequent long routes will be silently "
137 src->get_cname(), dst->get_cname(), link_list.size());
138 warned_about_long_routes = true;
142 /* Create the ns3 topology based on routing strategy */
143 static void postparse_cb()
145 IPV4addr.shrink_to_fit();
146 ns3::GlobalRouteManager::BuildGlobalRoutingDatabase();
147 ns3::GlobalRouteManager::InitializeRoutes();
153 void surf_network_model_init_NS3()
155 xbt_assert(surf_network_model == nullptr, "Cannot set the network model twice");
157 surf_network_model = new simgrid::kernel::resource::NetworkNS3Model();
160 static simgrid::config::Flag<std::string>
161 ns3_tcp_model("ns3/TcpModel", "The ns-3 tcp model can be : NewReno or Reno or Tahoe", "default");
167 NetworkNS3Model::NetworkNS3Model() : NetworkModel(Model::UpdateAlgo::FULL)
169 xbt_assert(not sg_link_energy_is_inited(),
170 "LinkEnergy plugin and ns-3 network models are not compatible. Are you looking for Ecofen, maybe?");
172 all_existing_models.push_back(this);
174 NetPointNs3::EXTENSION_ID = routing::NetPoint::extension_create<NetPointNs3>();
176 ns3_initialize(ns3_tcp_model.get());
178 routing::NetPoint::on_creation.connect([](routing::NetPoint& pt) {
179 pt.extension_set<NetPointNs3>(new NetPointNs3());
180 XBT_VERB("SimGrid's %s is known as node %d within ns-3", pt.get_cname(), pt.extension<NetPointNs3>()->node_num);
182 routing::on_cluster_creation.connect(&clusterCreation_cb);
184 s4u::Engine::on_platform_created.connect(&postparse_cb);
185 s4u::NetZone::on_route_creation.connect(&routeCreation_cb);
188 NetworkNS3Model::~NetworkNS3Model() {
192 LinkImpl* NetworkNS3Model::create_link(const std::string& name, const std::vector<double>& bandwidths, double latency,
193 s4u::Link::SharingPolicy policy)
195 XBT_INFO("create_link");
196 xbt_assert(bandwidths.size() == 1, "ns-3 links must use only 1 bandwidth.");
197 return new LinkNS3(this, name, bandwidths[0], latency, policy);
200 Action* NetworkNS3Model::communicate(s4u::Host* src, s4u::Host* dst, double size, double rate)
202 xbt_assert(rate == -1,
203 "Communication over ns-3 links cannot specify a specific rate. Please use -1 as a value instead of %f.",
205 return new NetworkNS3Action(this, size, src, dst);
208 double NetworkNS3Model::next_occurring_event(double now)
210 double time_to_next_flow_completion = 0.0;
211 XBT_DEBUG("ns3_next_occurring_event");
213 //get the first relevant value from the running_actions list
215 // If there is no comms in NS-3, then we do not move it forward.
216 // We will synchronize NS-3 with SimGrid when starting a new communication.
217 // (see NetworkNS3Action::NetworkNS3Action() for more details on this point)
218 if (get_started_action_set()->empty() || now == 0.0)
221 XBT_DEBUG("doing a ns3 simulation for a duration of %f", now);
223 time_to_next_flow_completion = ns3::Simulator::Now().GetSeconds() - surf_get_clock();
224 // NS-3 stops as soon as a flow ends,
225 // but it does not process the other flows that may finish at the same (simulated) time.
226 // If another flow ends at the same time, time_to_next_flow_completion = 0
227 if(double_equals(time_to_next_flow_completion, 0, sg_surf_precision))
228 time_to_next_flow_completion = 0.0;
230 XBT_DEBUG("min : %f", now);
231 XBT_DEBUG("ns3 time : %f", ns3::Simulator::Now().GetSeconds());
232 XBT_DEBUG("surf time : %f", surf_get_clock());
233 XBT_DEBUG("Next completion %f :", time_to_next_flow_completion);
235 return time_to_next_flow_completion;
238 void NetworkNS3Model::update_actions_state(double now, double delta)
240 static std::vector<std::string> socket_to_destroy;
242 std::string ns3_socket;
243 for (const auto& elm : flow_from_sock) {
244 ns3_socket = elm.first;
245 SgFlow* sgFlow = elm.second;
246 NetworkNS3Action * action = sgFlow->action_;
247 XBT_DEBUG("Processing socket %p (action %p)",sgFlow,action);
248 // Because NS3 stops as soon as a flow is finished, the other flows that ends at the same time may remains in an
249 // inconsistent state (i.e. remains_ == 0 but finished_ == false).
250 // However, SimGrid considers sometimes that an action with remains_ == 0 is finished.
251 // Thus, to avoid inconsistencies between SimGrid and NS3, set remains to 0 only when the flow is finished in NS3
252 int remains = action->get_cost() - sgFlow->sent_bytes_;
254 action->set_remains(remains);
256 if (TRACE_is_enabled() && action->get_state() == kernel::resource::Action::State::STARTED) {
257 double data_delta_sent = sgFlow->sent_bytes_ - action->last_sent_;
259 std::vector<LinkImpl*> route = std::vector<LinkImpl*>();
261 action->get_src().route_to(&action->get_dst(), route, nullptr);
262 for (auto const& link : route)
263 instr::resource_set_utilization("LINK", "bandwidth_used", link->get_cname(), action->get_category(),
264 (data_delta_sent) / delta, now - delta, delta);
266 action->last_sent_ = sgFlow->sent_bytes_;
269 if(sgFlow->finished_){
270 socket_to_destroy.push_back(ns3_socket);
271 XBT_DEBUG("Destroy socket %p of action %p", ns3_socket.c_str(), action);
272 action->set_remains(0);
273 action->finish(Action::State::FINISHED);
275 XBT_DEBUG("Socket %p sent %u bytes out of %u (%u remaining)", ns3_socket.c_str(), sgFlow->sent_bytes_,
276 sgFlow->total_bytes_, sgFlow->remaining_);
280 while (not socket_to_destroy.empty()) {
281 ns3_socket = socket_to_destroy.back();
282 socket_to_destroy.pop_back();
283 SgFlow* flow = flow_from_sock.at(ns3_socket);
284 if (XBT_LOG_ISENABLED(ns3, xbt_log_priority_debug)) {
285 XBT_DEBUG("Removing socket %p of action %p", ns3_socket.c_str(), flow->action_);
288 flow_from_sock.erase(ns3_socket);
289 sink_from_sock.erase(ns3_socket);
297 LinkNS3::LinkNS3(NetworkNS3Model* model, const std::string& name, double bandwidth, double latency,
298 s4u::Link::SharingPolicy policy)
299 : LinkImpl(model, name, nullptr)
302 bandwidth_.peak = bandwidth;
303 latency_.peak = latency;
304 sharing_policy_ = policy;
306 /* If wifi, create the wifizone now. If not, don't do anything: the links will be created in routeCreate_cb */
307 if (policy == s4u::Link::SharingPolicy::WIFI) {
308 // ns3::NodeContainer ap_nodes;
309 // ap_nodes.Create(1);
311 // phy.SetChannel (channel.Create ());
313 // wifi.SetRemoteStationManager ("ns3::AarfWifiManager");
315 // mac.SetType ("ns3::ApWifiMac");
316 // ns3::NetDeviceContainer apDevices;
317 // apDevices = wifi.Install (phy, mac, ap_nodes);
319 // mobility.SetMobilityModel ("ns3::ConstantPositionMobilityModel");
320 // mobility.Install (ap_nodes);
322 // stack.Install(ap_nodes);
324 // ns3::Ipv4AddressHelper address;
325 // std::string addr = simgrid::xbt::string_printf("%d.%d.0.0", number_of_networks, number_of_links);
326 // address.SetBase(addr.c_str(), "255.255.0.0");
327 // interfaces.Add(address.Assign(apDevices));
329 s4u::Link::on_creation(*this->get_iface());
332 LinkNS3::~LinkNS3() = default;
334 void LinkNS3::apply_event(profile::Event*, double)
338 void LinkNS3::set_bandwidth_profile(profile::Profile*)
340 xbt_die("The ns-3 network model doesn't support bandwidth profiles");
342 void LinkNS3::set_latency_profile(profile::Profile*)
344 xbt_die("The ns-3 network model doesn't support latency profiles");
351 NetworkNS3Action::NetworkNS3Action(Model* model, double totalBytes, s4u::Host* src, s4u::Host* dst)
352 : NetworkAction(model, *src, *dst, totalBytes, false)
354 // If there is no other started actions, we need to move NS-3 forward to be sync with SimGrid
355 if (model->get_started_action_set()->size()==1){
356 while(double_positive(surf_get_clock() - ns3::Simulator::Now().GetSeconds(), sg_surf_precision)){
357 XBT_DEBUG("Synchronizing NS-3 (time %f) with SimGrid (time %f)", ns3::Simulator::Now().GetSeconds(), surf_get_clock());
358 ns3_simulator(surf_get_clock() - ns3::Simulator::Now().GetSeconds());
362 XBT_DEBUG("Communicate from %s to %s", src->get_cname(), dst->get_cname());
364 static int port_number = 1025; // Port number is limited from 1025 to 65 000
366 unsigned int node1 = src->get_netpoint()->extension<NetPointNs3>()->node_num;
367 unsigned int node2 = dst->get_netpoint()->extension<NetPointNs3>()->node_num;
369 ns3::Ptr<ns3::Node> src_node = src->get_netpoint()->extension<NetPointNs3>()->ns3_node_;
370 ns3::Ptr<ns3::Node> dst_node = dst->get_netpoint()->extension<NetPointNs3>()->ns3_node_;
372 xbt_assert(node2 < IPV4addr.size(), "Element %s is unknown to ns-3. Is it connected to any one-hop link?",
373 dst->get_netpoint()->get_cname());
374 std::string& addr = IPV4addr[node2];
375 xbt_assert(not addr.empty(), "Element %s is unknown to ns-3. Is it connected to any one-hop link?",
376 dst->get_netpoint()->get_cname());
378 XBT_DEBUG("ns3: Create flow of %.0f Bytes from %u to %u with Interface %s", totalBytes, node1, node2, addr.c_str());
379 ns3::PacketSinkHelper sink("ns3::TcpSocketFactory", ns3::InetSocketAddress(ns3::Ipv4Address::GetAny(), port_number));
380 ns3::ApplicationContainer apps = sink.Install(dst_node);
382 ns3::Ptr<ns3::Socket> sock = ns3::Socket::CreateSocket(src_node, ns3::TcpSocketFactory::GetTypeId());
384 flow_from_sock.insert({transform_socket_ptr(sock), new SgFlow(totalBytes, this)});
385 sink_from_sock.insert({transform_socket_ptr(sock), apps});
387 sock->Bind(ns3::InetSocketAddress(port_number));
389 ns3::Simulator::ScheduleNow(&start_flow, sock, addr.c_str(), port_number);
392 if(port_number > 65000){
394 XBT_WARN("Too many connections! Port number is saturated. Trying to use the oldest ports.");
396 xbt_assert(port_number <= 65000, "Too many connections! Port number is saturated.");
398 s4u::Link::on_communicate(*this);
401 void NetworkNS3Action::suspend() {
405 void NetworkNS3Action::resume() {
409 std::list<LinkImpl*> NetworkNS3Action::get_links() const
413 void NetworkNS3Action::update_remains_lazy(double /*now*/)
418 } // namespace resource
419 } // namespace kernel
420 } // namespace simgrid
422 void ns3_simulator(double maxSeconds)
425 if (maxSeconds > 0.0) // If there is a maximum amount of time to run
426 id = ns3::Simulator::Schedule(ns3::Seconds(maxSeconds), &ns3::Simulator::Stop);
428 XBT_DEBUG("Start simulator for at most %fs (current time: %f)", maxSeconds, surf_get_clock());
429 ns3::Simulator::Run ();
430 XBT_DEBUG("Simulator stopped at %fs", ns3::Simulator::Now().GetSeconds());
436 // initialize the ns-3 interface and environment
437 void ns3_initialize(std::string TcpProtocol)
444 ns3::Config::SetDefault ("ns3::TcpSocket::SegmentSize", ns3::UintegerValue (1000));
445 ns3::Config::SetDefault ("ns3::TcpSocket::DelAckCount", ns3::UintegerValue (1));
446 ns3::Config::SetDefault ("ns3::TcpSocketBase::Timestamp", ns3::BooleanValue (false));
448 if (TcpProtocol == "default") {
451 } else if (TcpProtocol == "Reno") {
452 XBT_INFO("Switching Tcp protocol to '%s'", TcpProtocol.c_str());
453 ns3::Config::SetDefault ("ns3::TcpL4Protocol::SocketType", ns3::StringValue("ns3::TcpReno"));
455 } else if (TcpProtocol == "NewReno") {
456 XBT_INFO("Switching Tcp protocol to '%s'", TcpProtocol.c_str());
457 ns3::Config::SetDefault ("ns3::TcpL4Protocol::SocketType", ns3::StringValue("ns3::TcpNewReno"));
459 } else if (TcpProtocol == "Tahoe") {
460 XBT_INFO("Switching Tcp protocol to '%s'", TcpProtocol.c_str());
461 ns3::Config::SetDefault ("ns3::TcpL4Protocol::SocketType", ns3::StringValue("ns3::TcpTahoe"));
464 xbt_die("The ns3/TcpModel must be: NewReno or Reno or Tahoe");
468 void ns3_add_cluster(const char* /*id*/, double bw, double lat)
470 ns3::NodeContainer Nodes;
472 for (unsigned int i = number_of_clusters_nodes; i < Cluster_nodes.GetN(); i++) {
473 Nodes.Add(Cluster_nodes.Get(i));
474 XBT_DEBUG("Add node %u to cluster", i);
476 number_of_clusters_nodes = Cluster_nodes.GetN();
478 XBT_DEBUG("Add router %u to cluster", nodes.GetN() - Nodes.GetN() - 1);
479 Nodes.Add(nodes.Get(nodes.GetN()-Nodes.GetN()-1));
481 xbt_assert(Nodes.GetN() <= 65000, "Cluster with ns-3 is limited to 65000 nodes");
482 ns3::CsmaHelper csma;
483 csma.SetChannelAttribute("DataRate", ns3::DataRateValue(ns3::DataRate(bw * 8))); // ns-3 takes bps, but we provide Bps
484 csma.SetChannelAttribute("Delay", ns3::TimeValue(ns3::Seconds(lat)));
485 ns3::NetDeviceContainer devices = csma.Install(Nodes);
486 XBT_DEBUG("Create CSMA");
488 std::string addr = simgrid::xbt::string_printf("%d.%d.0.0", number_of_networks, number_of_links);
489 XBT_DEBUG("Assign IP Addresses %s to CSMA.", addr.c_str());
490 ns3::Ipv4AddressHelper ipv4;
491 ipv4.SetBase(addr.c_str(), "255.255.0.0");
492 interfaces.Add(ipv4.Assign (devices));
494 if(number_of_links == 255){
495 xbt_assert(number_of_networks < 255, "Number of links and networks exceed 255*255");
497 number_of_networks++;
501 XBT_DEBUG("Number of nodes in Cluster_nodes: %u", Cluster_nodes.GetN());
504 static std::string transformIpv4Address(ns3::Ipv4Address from)
506 std::stringstream sstream;
508 return sstream.str();
511 void ns3_add_direct_route(NetPointNs3* src, NetPointNs3* dst, double bw, double lat,
512 simgrid::s4u::Link::SharingPolicy policy)
515 XBT_INFO("ns3_add_direct_route");
516 ns3::Ipv4AddressHelper address;
517 ns3::NetDeviceContainer netA;
519 int srcNum = src->node_num;
520 int dstNum = dst->node_num;
522 ns3::Ptr<ns3::Node> a = src->ns3_node_;
523 ns3::Ptr<ns3::Node> b = dst->ns3_node_;
525 if (policy == simgrid::s4u::Link::SharingPolicy::WIFI) {
526 // wifi.SetStandard (ns3::WIFI_PHY_STANDARD_80211n_2_4GHZ);
527 // wifi.SetStandard (ns3::WIFI_PHY_STANDARD_80211ac);
529 wifiChannel.SetPropagationDelay ("ns3::ConstantSpeedPropagationDelayModel");
531 // wifiChannel.AddPropagationLoss ("ns3::LogDistancePropagationLossModel",
532 // "Exponent", ns3::DoubleValue (3.0),
533 // "ReferenceLoss", ns3::DoubleValue (40.0459));
535 wifiPhy.SetChannel (wifiChannel.Create ());
537 // wifi.SetRemoteStationManager ("ns3::ConstantRateWifiManager",
538 // "ControlMode", ns3::StringValue ("VhtMcs0"),
539 // "DataMode", ns3::StringValue ("VhtMcs9"));
541 mobility.SetMobilityModel ("ns3::ConstantPositionMobilityModel");
543 ns3::Ssid ssid = ns3::Ssid (std::to_string(number_of_networks) + "_" + std::to_string(number_of_links));
545 wifiMac.SetType("ns3::ApWifiMac",
546 "Ssid", ns3::SsidValue (ssid));
547 netA.Add(wifi.Install (wifiPhy, wifiMac, a));
549 wifiMac.SetType ("ns3::StaWifiMac",
550 "Ssid", ns3::SsidValue (ssid),
551 "ActiveProbing", ns3::BooleanValue (false));
552 netA.Add(wifi.Install (wifiPhy, wifiMac, b));
554 ns3::Ptr<ns3::ListPositionAllocator> positionAllocS = ns3::CreateObject<ns3::ListPositionAllocator> ();
555 // positionAllocS->Add(ns3::Vector(-5, mobility_base, 0.0));
556 // positionAllocS->Add(ns3::Vector(5, mobility_base, 0.0));
557 positionAllocS->Add(ns3::Vector(-5, 0, 0.0));
558 positionAllocS->Add(ns3::Vector(5, 0, 0.0));
559 // mobility_base += mobility_delta;
560 mobility.SetPositionAllocator(positionAllocS);
565 ns3::PointToPointHelper pointToPoint;
567 XBT_DEBUG("\tAdd PTP from %d to %d bw:'%f Bps' lat:'%fs'", srcNum, dstNum, bw, lat);
568 pointToPoint.SetDeviceAttribute("DataRate",
569 ns3::DataRateValue(ns3::DataRate(bw * 8))); // ns-3 takes bps, but we provide Bps
570 pointToPoint.SetChannelAttribute("Delay", ns3::TimeValue(ns3::Seconds(lat)));
572 netA.Add(pointToPoint.Install(a, b));
575 std::string addr = simgrid::xbt::string_printf("%d.%d.0.0", number_of_networks, number_of_links);
576 address.SetBase(addr.c_str(), "255.255.0.0");
577 XBT_DEBUG("\tInterface stack '%s'", addr.c_str());
578 interfaces.Add(address.Assign (netA));
580 if (IPV4addr.size() <= (unsigned)srcNum)
581 IPV4addr.resize(srcNum + 1);
582 IPV4addr[srcNum] = transformIpv4Address(interfaces.GetAddress(interfaces.GetN() - 2));
584 if (IPV4addr.size() <= (unsigned)dstNum)
585 IPV4addr.resize(dstNum + 1);
586 IPV4addr[dstNum] = transformIpv4Address(interfaces.GetAddress(interfaces.GetN() - 1));
588 if (number_of_links == 255){
589 xbt_assert(number_of_networks < 255, "Number of links and networks exceed 255*255");
591 number_of_networks++;