X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/3b2cba76f01c60f2dea5ff0b1cb0b30931f90748..cf6a1d5f1eddea2b377415ab57c5185058488269:/src/surf/network_ns3.cpp diff --git a/src/surf/network_ns3.cpp b/src/surf/network_ns3.cpp index 8bad9179dc..1180f02b1f 100644 --- a/src/surf/network_ns3.cpp +++ b/src/surf/network_ns3.cpp @@ -11,15 +11,15 @@ #include "xbt/string.hpp" #include "xbt/utility.hpp" +#include #include #include +#include #include #include #include #include #include -#include -#include #include "ns3/mobility-module.h" #include "ns3/wifi-module.h" @@ -28,11 +28,13 @@ #include "ns3/ns3_simulator.hpp" #include "simgrid/kernel/routing/NetPoint.hpp" +#include "simgrid/kernel/routing/NetZoneImpl.hpp" #include "simgrid/kernel/routing/WifiZone.hpp" #include "simgrid/plugins/energy.h" #include "simgrid/s4u/Engine.hpp" #include "simgrid/s4u/NetZone.hpp" #include "src/instr/instr_private.hpp" // TRACE_is_enabled(). FIXME: remove by subscribing tracing to the surf signals +#include "src/kernel/EngineImpl.hpp" #include "src/surf/surf_interface.hpp" #include "src/surf/xml/platf_private.hpp" #include "surf/surf.hpp" @@ -48,7 +50,7 @@ extern std::map> sink_from_s static ns3::InternetStackHelper stack; -static int number_of_links = 1; +static int number_of_links = 1; static int number_of_networks = 1; /* wifi globals */ @@ -76,118 +78,117 @@ NetPointNs3::NetPointNs3() : ns3_node_(ns3::CreateObject(0)) stack.Install(ns3_node_); } -void resumeWifiDevice(ns3::Ptr device) { - device->GetPhy()->ResumeFromOff(); +static void resumeWifiDevice(ns3::Ptr device) +{ + device->GetPhy()->ResumeFromOff(); } /************* * Callbacks * *************/ -static void zoneCreation_cb(simgrid::s4u::NetZone const& zone) { - simgrid::kernel::routing::WifiZone* wifizone = dynamic_cast (zone.get_impl()); - if (wifizone == nullptr) return; +static void zoneCreation_cb(simgrid::s4u::NetZone const& zone) +{ + simgrid::kernel::routing::WifiZone* wifizone = dynamic_cast(zone.get_impl()); + if (wifizone == nullptr) + return; #if NS3_MINOR_VERSION < 32 - wifi.SetStandard(ns3::WIFI_PHY_STANDARD_80211n_5GHZ); + wifi.SetStandard(ns3::WIFI_PHY_STANDARD_80211n_5GHZ); #else - wifi.SetStandard(ns3::WIFI_STANDARD_80211n_5GHZ); + wifi.SetStandard(ns3::WIFI_STANDARD_80211n_5GHZ); #endif - std::string ssid = wifizone->get_name(); - const char* mcs = wifizone->get_property("mcs"); - const char* nss = wifizone->get_property("nss"); - int mcs_value = mcs ? atoi(mcs) : 3; - int nss_value = nss ? atoi(nss) : 1; + std::string ssid = wifizone->get_name(); + const char* mcs = wifizone->get_property("mcs"); + const char* nss = wifizone->get_property("nss"); + int mcs_value = mcs ? atoi(mcs) : 3; + int nss_value = nss ? atoi(nss) : 1; #if NS3_MINOR_VERSION < 30 - if(nss_value != 1+(mcs_value/8)) - xbt_die("On NS3 < 3.30, NSS value has to satisfy NSS == 1+(MCS/8) constraint. Bailing out"); + xbt_assert(nss_value == 1 + (mcs_value / 8), + "On NS3 < 3.30, NSS value has to satisfy NSS == 1+(MCS/8) constraint. Bailing out"); #endif - wifi.SetRemoteStationManager("ns3::ConstantRateWifiManager", - "ControlMode", ns3::StringValue("HtMcs0"), - "DataMode", ns3::StringValue("HtMcs" + std::to_string(mcs_value))); - wifiPhy.SetChannel(wifiChannel.Create()); - wifiPhy.Set("Antennas", ns3::UintegerValue(nss_value)); - wifiPhy.Set("MaxSupportedTxSpatialStreams", ns3::UintegerValue(nss_value)); - wifiPhy.Set("MaxSupportedRxSpatialStreams", ns3::UintegerValue(nss_value)); - wifiMac.SetType("ns3::ApWifiMac", - "Ssid", ns3::SsidValue(ssid)); - - mobility.SetMobilityModel("ns3::ConstantPositionMobilityModel"); - ns3::Ptr positionAllocS = ns3::CreateObject(); - positionAllocS->Add(ns3::Vector(0, 0, 255 * 100 * number_of_networks + 100 * number_of_links)); - - ns3::NetDeviceContainer netDevices; - NetPointNs3* access_point_netpoint_ns3 = wifizone->get_access_point()->extension(); - - ns3::Ptr access_point_ns3_node = access_point_netpoint_ns3->ns3_node_; - ns3::NodeContainer nodes = {access_point_ns3_node}; - std::vector hosts_netpoints = {access_point_netpoint_ns3}; - netDevices.Add(wifi.Install(wifiPhy, wifiMac,access_point_ns3_node)); - - wifiMac.SetType ("ns3::StaWifiMac", - "Ssid", ns3::SsidValue(ssid), - "ActiveProbing", ns3::BooleanValue(false)); - - NetPointNs3* station_netpoint_ns3 = nullptr; - ns3::Ptr station_ns3_node = nullptr; - double distance; - double angle = 0; - int nb_stations = wifizone->get_all_hosts().size() - 1; - double step = 2 * M_PI / nb_stations; - for (auto station_host : wifizone->get_all_hosts()) { - station_netpoint_ns3 = station_host->get_netpoint()->extension(); - if (station_netpoint_ns3 == access_point_netpoint_ns3) - continue; - hosts_netpoints.push_back(station_netpoint_ns3); - distance = station_host->get_property("wifi_distance") ? atof(station_host->get_property("wifi_distance")) : 10.0; - positionAllocS->Add(ns3::Vector(distance * std::cos(angle), distance * std::sin(angle), 255 * 100 * number_of_networks + 100 * number_of_links)); - angle += step; - station_ns3_node = station_netpoint_ns3->ns3_node_; - nodes.Add(station_ns3_node); - netDevices.Add(wifi.Install(wifiPhy, wifiMac, station_ns3_node)); - } + wifi.SetRemoteStationManager("ns3::ConstantRateWifiManager", "ControlMode", ns3::StringValue("HtMcs0"), "DataMode", + ns3::StringValue("HtMcs" + std::to_string(mcs_value))); + wifiPhy.SetChannel(wifiChannel.Create()); + wifiPhy.Set("Antennas", ns3::UintegerValue(nss_value)); + wifiPhy.Set("MaxSupportedTxSpatialStreams", ns3::UintegerValue(nss_value)); + wifiPhy.Set("MaxSupportedRxSpatialStreams", ns3::UintegerValue(nss_value)); + wifiMac.SetType("ns3::ApWifiMac", "Ssid", ns3::SsidValue(ssid)); + + mobility.SetMobilityModel("ns3::ConstantPositionMobilityModel"); + ns3::Ptr positionAllocS = ns3::CreateObject(); + positionAllocS->Add(ns3::Vector(0, 0, 255 * 100 * number_of_networks + 100 * number_of_links)); + + ns3::NetDeviceContainer netDevices; + NetPointNs3* access_point_netpoint_ns3 = wifizone->get_access_point()->extension(); + + ns3::Ptr access_point_ns3_node = access_point_netpoint_ns3->ns3_node_; + ns3::NodeContainer nodes = {access_point_ns3_node}; + std::vector hosts_netpoints = {access_point_netpoint_ns3}; + netDevices.Add(wifi.Install(wifiPhy, wifiMac, access_point_ns3_node)); + + wifiMac.SetType("ns3::StaWifiMac", "Ssid", ns3::SsidValue(ssid), "ActiveProbing", ns3::BooleanValue(false)); + + NetPointNs3* station_netpoint_ns3 = nullptr; + ns3::Ptr station_ns3_node = nullptr; + double distance; + double angle = 0; + int nb_stations = wifizone->get_all_hosts().size() - 1; + double step = 2 * M_PI / nb_stations; + for (auto station_host : wifizone->get_all_hosts()) { + station_netpoint_ns3 = station_host->get_netpoint()->extension(); + if (station_netpoint_ns3 == access_point_netpoint_ns3) + continue; + hosts_netpoints.push_back(station_netpoint_ns3); + distance = station_host->get_property("wifi_distance") ? atof(station_host->get_property("wifi_distance")) : 10.0; + positionAllocS->Add(ns3::Vector(distance * std::cos(angle), distance * std::sin(angle), + 255 * 100 * number_of_networks + 100 * number_of_links)); + angle += step; + station_ns3_node = station_netpoint_ns3->ns3_node_; + nodes.Add(station_ns3_node); + netDevices.Add(wifi.Install(wifiPhy, wifiMac, station_ns3_node)); + } - const char* start_time = wifizone->get_property("start_time"); - int start_time_value = start_time ? atoi(start_time) : 0; - auto resume = [](ns3::Ptr device){device->GetPhy()->ResumeFromOff();}; - for (int i = 0; i < netDevices.GetN(); i++) { - ns3::Ptr device = ns3::StaticCast(netDevices.Get(i)); - device->GetPhy()->SetOffMode(); - ns3::Simulator::Schedule( - ns3::Seconds(start_time_value), - &resumeWifiDevice, - device); - } + const char* start_time = wifizone->get_property("start_time"); + int start_time_value = start_time ? atoi(start_time) : 0; + for (uint32_t i = 0; i < netDevices.GetN(); i++) { + ns3::Ptr device = ns3::StaticCast(netDevices.Get(i)); + device->GetPhy()->SetOffMode(); + ns3::Simulator::Schedule(ns3::Seconds(start_time_value), &resumeWifiDevice, device); + } - ns3::Config::Set("/NodeList/*/DeviceList/*/$ns3::WifiNetDevice/Phy/ChannelWidth", ns3::UintegerValue(40)); + ns3::Config::Set("/NodeList/*/DeviceList/*/$ns3::WifiNetDevice/Phy/ChannelWidth", ns3::UintegerValue(40)); - mobility.SetPositionAllocator(positionAllocS); - mobility.Install(nodes); + mobility.SetPositionAllocator(positionAllocS); + mobility.Install(nodes); - ns3::Ipv4AddressHelper address; - std::string addr = simgrid::xbt::string_printf("%d.%d.0.0", number_of_networks, number_of_links); - address.SetBase(addr.c_str(), "255.255.0.0"); - XBT_DEBUG("\tInterface stack '%s'", addr.c_str()); - ns3::Ipv4InterfaceContainer addresses = address.Assign(netDevices); - for (unsigned int i = 0; i < hosts_netpoints.size(); i++) { - hosts_netpoints[i]->ipv4_address_ = transformIpv4Address(addresses.GetAddress(i)); - } + ns3::Ipv4AddressHelper address; + std::string addr = simgrid::xbt::string_printf("%d.%d.0.0", number_of_networks, number_of_links); + address.SetBase(addr.c_str(), "255.255.0.0"); + XBT_DEBUG("\tInterface stack '%s'", addr.c_str()); + ns3::Ipv4InterfaceContainer addresses = address.Assign(netDevices); + for (unsigned int i = 0; i < hosts_netpoints.size(); i++) { + hosts_netpoints[i]->ipv4_address_ = transformIpv4Address(addresses.GetAddress(i)); + } - if (number_of_links == 255) { - xbt_assert(number_of_networks < 255, "Number of links and networks exceed 255*255"); - number_of_links = 1; - number_of_networks++; - } else { - number_of_links++; - } + if (number_of_links == 255) { + xbt_assert(number_of_networks < 255, "Number of links and networks exceed 255*255"); + number_of_links = 1; + number_of_networks++; + } else { + number_of_links++; + } } static void clusterCreation_cb(simgrid::kernel::routing::ClusterCreationArgs const& cluster) { ns3::NodeContainer Nodes; - for (int const& i : *cluster.radicals) { + xbt_assert(cluster.topology == simgrid::kernel::routing::ClusterTopology::FLAT, + "NS-3 is supported only by flat clusters. Do not use with other topologies"); + + for (int const& i : cluster.radicals) { // Create private link std::string host_id = cluster.prefix + std::to_string(i) + cluster.suffix; auto* src = simgrid::s4u::Host::by_name(host_id)->get_netpoint(); @@ -231,6 +232,10 @@ static void routeCreation_cb(bool symmetrical, simgrid::kernel::routing::NetPoin simgrid::kernel::routing::NetPoint* /*gw_dst*/, std::vector const& link_list) { + /* ignoring routes from StarZone, not supported */ + if (not src || not dst) + return; + if (link_list.size() == 1) { auto const* link = static_cast(link_list[0]); @@ -262,9 +267,9 @@ static void routeCreation_cb(bool symmetrical, simgrid::kernel::routing::NetPoin *********/ void surf_network_model_init_NS3() { - xbt_assert(surf_network_model == nullptr, "Cannot set the network model twice"); - - surf_network_model = new simgrid::kernel::resource::NetworkNS3Model(); + auto net_model = std::make_shared("NS3 network model"); + simgrid::kernel::EngineImpl::get_instance()->add_model(net_model); + simgrid::s4u::Engine::get_instance()->get_netzone_root()->get_impl()->set_network_model(net_model); } static simgrid::config::Flag @@ -272,7 +277,7 @@ static simgrid::config::Flag static simgrid::config::Flag ns3_seed( "ns3/seed", "The random seed provided to ns-3. Either 'time' to seed with time(), blank to not set (default), or a number.", "", - [](std::string val) { + [](const std::string& val) { if (val.length() == 0) return; if (strcasecmp(val.c_str(), "time") == 0) { @@ -291,13 +296,11 @@ namespace simgrid { namespace kernel { namespace resource { -NetworkNS3Model::NetworkNS3Model() : NetworkModel(Model::UpdateAlgo::FULL) +NetworkNS3Model::NetworkNS3Model(const std::string& name) : NetworkModel(name) { xbt_assert(not sg_link_energy_is_inited(), "LinkEnergy plugin and ns-3 network models are not compatible. Are you looking for Ecofen, maybe?"); - all_existing_models.push_back(this); - NetPointNs3::EXTENSION_ID = routing::NetPoint::extension_create(); ns3::Config::SetDefault("ns3::TcpSocket::SegmentSize", ns3::UintegerValue(1000)); @@ -331,11 +334,15 @@ NetworkNS3Model::NetworkNS3Model() : NetworkModel(Model::UpdateAlgo::FULL) s4u::NetZone::on_seal.connect(&zoneCreation_cb); } -LinkImpl* NetworkNS3Model::create_link(const std::string& name, const std::vector& bandwidths, double latency, - s4u::Link::SharingPolicy policy) +LinkImpl* NetworkNS3Model::create_link(const std::string& name, const std::vector& bandwidths) { xbt_assert(bandwidths.size() == 1, "ns-3 links must use only 1 bandwidth."); - return new LinkNS3(this, name, bandwidths[0], latency, policy); + return (new LinkNS3(name, bandwidths[0]))->set_model(this); +} + +LinkImpl* NetworkNS3Model::create_wifi_link(const std::string& name, const std::vector& bandwidths) +{ + return create_link(name, bandwidths)->set_sharing_policy(s4u::Link::SharingPolicy::WIFI); } Action* NetworkNS3Model::communicate(s4u::Host* src, s4u::Host* dst, double size, double rate) @@ -351,7 +358,7 @@ double NetworkNS3Model::next_occurring_event(double now) double time_to_next_flow_completion = 0.0; XBT_DEBUG("ns3_next_occurring_event"); - //get the first relevant value from the running_actions list + // get the first relevant value from the running_actions list // If there is no comms in NS-3, then we do not move it forward. // We will synchronize NS-3 with SimGrid when starting a new communication. @@ -365,7 +372,7 @@ double NetworkNS3Model::next_occurring_event(double now) // NS-3 stops as soon as a flow ends, // but it does not process the other flows that may finish at the same (simulated) time. // If another flow ends at the same time, time_to_next_flow_completion = 0 - if(double_equals(time_to_next_flow_completion, 0, sg_surf_precision)) + if (double_equals(time_to_next_flow_completion, 0, sg_surf_precision)) time_to_next_flow_completion = 0.0; XBT_DEBUG("min : %f", now); @@ -382,16 +389,16 @@ void NetworkNS3Model::update_actions_state(double now, double delta) std::string ns3_socket; for (const auto& elm : flow_from_sock) { - ns3_socket = elm.first; - SgFlow* sgFlow = elm.second; - NetworkNS3Action * action = sgFlow->action_; + ns3_socket = elm.first; + SgFlow* sgFlow = elm.second; + NetworkNS3Action* action = sgFlow->action_; XBT_DEBUG("Processing flow %p (socket %s, action %p)", sgFlow, ns3_socket.c_str(), action); // Because NS3 stops as soon as a flow is finished, the other flows that ends at the same time may remains in an // inconsistent state (i.e. remains_ == 0 but finished_ == false). // However, SimGrid considers sometimes that an action with remains_ == 0 is finished. // Thus, to avoid inconsistencies between SimGrid and NS3, set remains to 0 only when the flow is finished in NS3 int remains = action->get_cost() - sgFlow->sent_bytes_; - if(remains > 0) + if (remains > 0) action->set_remains(remains); if (TRACE_is_enabled() && action->get_state() == kernel::resource::Action::State::STARTED) { @@ -407,7 +414,8 @@ void NetworkNS3Model::update_actions_state(double now, double delta) action->last_sent_ = sgFlow->sent_bytes_; } - if ((sgFlow->finished_) && (remains <= 0)) { // finished_ should not become true before remains gets to 0, but it sometimes does. Let's play safe, here. + if ((sgFlow->finished_) && (remains <= 0)) { // finished_ should not become true before remains gets to 0, but it + // sometimes does. Let's play safe, here. socket_to_destroy.push_back(ns3_socket); XBT_DEBUG("Destroy socket %s of action %p", ns3_socket.c_str(), action); action->set_remains(0); @@ -435,14 +443,9 @@ void NetworkNS3Model::update_actions_state(double now, double delta) * Resource * ************/ -LinkNS3::LinkNS3(NetworkNS3Model* model, const std::string& name, double bandwidth, double latency, - s4u::Link::SharingPolicy policy) - : LinkImpl(model, name, nullptr), sharing_policy_(policy) +LinkNS3::LinkNS3(const std::string& name, double bandwidth) : LinkImpl(name) { bandwidth_.peak = bandwidth; - latency_.peak = latency; - - s4u::Link::on_creation(*this->get_iface()); } LinkNS3::~LinkNS3() = default; @@ -451,15 +454,30 @@ void LinkNS3::apply_event(profile::Event*, double) { THROW_UNIMPLEMENTED; } -void LinkNS3::set_bandwidth_profile(profile::Profile*) + +LinkImpl* LinkNS3::set_bandwidth_profile(profile::Profile* profile) { - xbt_die("The ns-3 network model doesn't support bandwidth profiles"); + xbt_assert(profile == nullptr, "The ns-3 network model doesn't support bandwidth profiles"); + return this; } -void LinkNS3::set_latency_profile(profile::Profile*) + +LinkImpl* LinkNS3::set_latency_profile(profile::Profile* profile) +{ + xbt_assert(profile == nullptr, "The ns-3 network model doesn't support latency profiles"); + return this; +} + +LinkImpl* LinkNS3::set_latency(double latency) { - xbt_die("The ns-3 network model doesn't support latency profiles"); + latency_.peak = latency; + return this; } +LinkImpl* LinkNS3::set_sharing_policy(s4u::Link::SharingPolicy policy) +{ + sharing_policy_ = policy; + return this; +} /********** * Action * **********/ @@ -482,9 +500,10 @@ NetworkNS3Action::NetworkNS3Action(Model* model, double totalBytes, s4u::Host* s } // If there is no other started actions, we need to move NS-3 forward to be sync with SimGrid - if (model->get_started_action_set()->size()==1){ - while(double_positive(surf_get_clock() - ns3::Simulator::Now().GetSeconds(), sg_surf_precision)){ - XBT_DEBUG("Synchronizing NS-3 (time %f) with SimGrid (time %f)", ns3::Simulator::Now().GetSeconds(), surf_get_clock()); + if (model->get_started_action_set()->size() == 1) { + while (double_positive(surf_get_clock() - ns3::Simulator::Now().GetSeconds(), sg_surf_precision)) { + XBT_DEBUG("Synchronizing NS-3 (time %f) with SimGrid (time %f)", ns3::Simulator::Now().GetSeconds(), + surf_get_clock()); ns3_simulator(surf_get_clock() - ns3::Simulator::Now().GetSeconds()); } } @@ -519,11 +538,13 @@ NetworkNS3Action::NetworkNS3Action(Model* model, double totalBytes, s4u::Host* s s4u::Link::on_communicate(*this); } -void NetworkNS3Action::suspend() { +void NetworkNS3Action::suspend() +{ THROW_UNIMPLEMENTED; } -void NetworkNS3Action::resume() { +void NetworkNS3Action::resume() +{ THROW_UNIMPLEMENTED; } @@ -547,10 +568,10 @@ void ns3_simulator(double maxSeconds) id = ns3::Simulator::Schedule(ns3::Seconds(maxSeconds), &ns3::Simulator::Stop); XBT_DEBUG("Start simulator for at most %fs (current time: %f)", maxSeconds, surf_get_clock()); - ns3::Simulator::Run (); + ns3::Simulator::Run(); XBT_DEBUG("Simulator stopped at %fs", ns3::Simulator::Now().GetSeconds()); - if(maxSeconds > 0.0) + if (maxSeconds > 0.0) id.Cancel(); } @@ -567,33 +588,32 @@ void ns3_add_direct_route(simgrid::kernel::routing::NetPoint* src, simgrid::kern xbt_assert(host_src != nullptr, "Network element %s does not seem to be ns-3-ready", src->get_cname()); xbt_assert(host_dst != nullptr, "Network element %s does not seem to be ns-3-ready", dst->get_cname()); - if (policy == simgrid::s4u::Link::SharingPolicy::WIFI) { - xbt_die("The wifi sharing policy is not supported for links. You want to use a wifi zone (see documentation)."); - } else { - ns3::PointToPointHelper pointToPoint; + xbt_assert(policy != simgrid::s4u::Link::SharingPolicy::WIFI, + "The wifi sharing policy is not supported for links. You want to use a wifi zone (see documentation)."); - XBT_DEBUG("\tAdd PTP from %s to %s bw:'%f Bps' lat:'%fs'", src->get_cname(), dst->get_cname(), bw, lat); - pointToPoint.SetDeviceAttribute("DataRate", - ns3::DataRateValue(ns3::DataRate(bw * 8))); // ns-3 takes bps, but we provide Bps - pointToPoint.SetChannelAttribute("Delay", ns3::TimeValue(ns3::Seconds(lat))); + ns3::PointToPointHelper pointToPoint; - netA.Add(pointToPoint.Install(host_src->ns3_node_, host_dst->ns3_node_)); + XBT_DEBUG("\tAdd PTP from %s to %s bw:'%f Bps' lat:'%fs'", src->get_cname(), dst->get_cname(), bw, lat); + pointToPoint.SetDeviceAttribute("DataRate", + ns3::DataRateValue(ns3::DataRate(bw * 8))); // ns-3 takes bps, but we provide Bps + pointToPoint.SetChannelAttribute("Delay", ns3::TimeValue(ns3::Seconds(lat))); - std::string addr = simgrid::xbt::string_printf("%d.%d.0.0", number_of_networks, number_of_links); - address.SetBase(addr.c_str(), "255.255.0.0"); - XBT_DEBUG("\tInterface stack '%s'", addr.c_str()); + netA.Add(pointToPoint.Install(host_src->ns3_node_, host_dst->ns3_node_)); - auto addresses = address.Assign(netA); + std::string addr = simgrid::xbt::string_printf("%d.%d.0.0", number_of_networks, number_of_links); + address.SetBase(addr.c_str(), "255.255.0.0"); + XBT_DEBUG("\tInterface stack '%s'", addr.c_str()); - host_src->ipv4_address_ = transformIpv4Address(addresses.GetAddress(0)); - host_dst->ipv4_address_ = transformIpv4Address(addresses.GetAddress(1)); + auto addresses = address.Assign(netA); - if (number_of_links == 255) { - xbt_assert(number_of_networks < 255, "Number of links and networks exceed 255*255"); - number_of_links = 1; - number_of_networks++; - } else { - number_of_links++; - } + host_src->ipv4_address_ = transformIpv4Address(addresses.GetAddress(0)); + host_dst->ipv4_address_ = transformIpv4Address(addresses.GetAddress(1)); + + if (number_of_links == 255) { + xbt_assert(number_of_networks < 255, "Number of links and networks exceed 255*255"); + number_of_links = 1; + number_of_networks++; + } else { + number_of_links++; } }