82   NetDeviceContainer nd0 = csma.Install (c0);  // First LAN

    82   NetDeviceContainer nd0 = csma.Install (c0);  // First LAN

    83   NetDeviceContainer nd1 = csma.Install (c1);  // Second LAN

    83   NetDeviceContainer nd1 = csma.Install (c1);  // Second LAN

    84 

    84 

    85   NS_LOG_INFO ("Add IP Stack.");

    85   NS_LOG_INFO ("Add IP Stack.");

    86   InternetStackHelper internet;

    86   InternetStackHelper internet;

    89 

    88 

    90   NS_LOG_INFO ("Assign IP Addresses.");

    89   NS_LOG_INFO ("Assign IP Addresses.");

    91   Ipv4AddressHelper ipv4Addr;

    90   Ipv4AddressHelper ipv4Addr;

    92   ipv4Addr.SetBase ("10.1.1.0", "255.255.255.0");

    91   ipv4Addr.SetBase ("10.1.1.0", "255.255.255.0");

    93   ipv4Addr.Assign (nd0);

    92   ipv4Addr.Assign (nd0);