Examples of java.net.InetAddress$InetAddressHolder

java.net.InetAddress

etf.org/rfc/rfc790.txt">RFC 790: Assigned Numbers, RFC 1918: Address Allocation for Private Internets, RFC 2365: Administratively Scoped IP Multicast, and RFC 2373: IP Version 6 Addressing Architecture. An instance of an InetAddress consists of an IP address and possibly its corresponding host name (depending on whether it is constructed with a host name or whether it has already done reverse host name resolution).

Address types

unicast An identifier for a single interface. A packet sent to a unicast address is delivered to the interface identified by that address.
The Unspecified Address -- Also called anylocal or wildcard address. It must never be assigned to any node. It indicates the absence of an address. One example of its use is as the target of bind, which allows a server to accept a client connection on any interface, in case the server host has multiple interfaces.
The unspecified address must not be used as the destination address of an IP packet.
The Loopback Addresses -- This is the address assigned to the loopback interface. Anything sent to this IP address loops around and becomes IP input on the local host. This address is often used when testing a client.

multicast An identifier for a set of interfaces (typically belonging to different nodes). A packet sent to a multicast address is delivered to all interfaces identified by that address.

unicast	An identifier for a single interface. A packet sent to a unicast address is delivered to the interface identified by that address. The Unspecified Address -- Also called anylocal or wildcard address. It must never be assigned to any node. It indicates the absence of an address. One example of its use is as the target of bind, which allows a server to accept a client connection on any interface, in case the server host has multiple interfaces. The unspecified address must not be used as the destination address of an IP packet. The Loopback Addresses -- This is the address assigned to the loopback interface. Anything sent to this IP address loops around and becomes IP input on the local host. This address is often used when testing a client.
multicast	An identifier for a set of interfaces (typically belonging to different nodes). A packet sent to a multicast address is delivered to all interfaces identified by that address.

IP address scope

Link-local addresses are designed to be used for addressing on a single link for purposes such as auto-address configuration, neighbor discovery, or when no routers are present.

Site-local addresses are designed to be used for addressing inside of a site without the need for a global prefix.

Global addresses are unique across the internet.

Textual representation of IP addresses

The textual representation of an IP address is address family specific.

For IPv4 address format, please refer to Inet4Address#format; For IPv6 address format, please refer to Inet6Address#format.

There is a couple of System Properties affecting how IPv4 and IPv6 addresses are used.

Host Name Resolution

Host name-to-IP address resolution is accomplished through the use of a combination of local machine configuration information and network naming services such as the Domain Name System (DNS) and Network Information Service(NIS). The particular naming services(s) being used is by default the local machine configured one. For any host name, its corresponding IP address is returned.

Reverse name resolution means that for any IP address, the host associated with the IP address is returned.

The InetAddress class provides methods to resolve host names to their IP addresses and vice versa.

InetAddress Caching

The InetAddress class has a cache to store successful as well as unsuccessful host name resolutions.

By default, when a security manager is installed, in order to protect against DNS spoofing attacks, the result of positive host name resolutions are cached forever. When a security manager is not installed, the default behavior is to cache entries for a finite (implementation dependent) period of time. The result of unsuccessful host name resolution is cached for a very short period of time (10 seconds) to improve performance.

If the default behavior is not desired, then a Java security property can be set to a different Time-to-live (TTL) value for positive caching. Likewise, a system admin can configure a different negative caching TTL value when needed.

Two Java security properties control the TTL values used for positive and negative host name resolution caching:

networkaddress.cache.ttl

Indicates the caching policy for successful name lookups from the name service. The value is specified as as integer to indicate the number of seconds to cache the successful lookup. The default setting is to cache for an implementation specific period of time.
A value of -1 indicates "cache forever".

networkaddress.cache.negative.ttl (default: 10)

Indicates the caching policy for un-successful name lookups from the name service. The value is specified as as integer to indicate the number of seconds to cache the failure for un-successful lookups.
A value of 0 indicates "never cache". A value of -1 indicates "cache forever".

@author Chris Warth @see java.net.InetAddress#getByAddress(byte[]) @see java.net.InetAddress#getByAddress(java.lang.String,byte[]) @see java.net.InetAddress#getAllByName(java.lang.String) @see java.net.InetAddress#getByName(java.lang.String) @see java.net.InetAddress#getLocalHost() @since JDK1.0

    
    // create the layer described by INETADDRESSES
    protocol = Configurator.createProtocol(addressProps, stack) ;
        
    // get the value which should have been assigned a default
    InetAddress a = ((INETADDRESSES)protocol).getInetAddressField() ;
    System.out.println("value of inetAddressField = " + a) ;
    
    // get the value which should not have been assigned a default
    InetAddress b = ((INETADDRESSES)protocol).getInetAddressMethod() ;
    System.out.println("value of inetAddressMethod = " + b) ;
    
    // get the value which should have been assigned a default
    List<IpAddress> c = ((INETADDRESSES)protocol).getIpAddressListField() ;
    System.out.println("value of ipAddressListField = " + c) ;

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    this.hostName = host.toLowerCase();
      this.portNumber = port;
      
      //only cache inetaddresses if they represent the ip. 
      try {
      InetAddress addr = InetAddress.getByName(this.hostName);
      if (addr.getHostAddress().equalsIgnoreCase(this.hostName)) {
        this.inetAddress = addr;
      }
    } catch (UnknownHostException e) {
    }
    }

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    return new SocketServerConnection(this, url.isUsingSSL(), discovery, connectionProperties);
  }


  static void updateConnectionProperties(Properties connectionProperties) {
    try {
      InetAddress addr = InetAddress.getLocalHost();
      connectionProperties.put(TeiidURL.CONNECTION.CLIENT_IP_ADDRESS, addr.getHostAddress());
      connectionProperties.put(TeiidURL.CONNECTION.CLIENT_HOSTNAME, addr.getCanonicalHostName());
        } catch (UnknownHostException err1) {
          connectionProperties.put(TeiidURL.CONNECTION.CLIENT_IP_ADDRESS, "UnknownClientAddress"); //$NON-NLS-1$
        }
  }

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    if (host == null || host.trim().length() == 0) {
      System.out.println("Using undefined host: " + UNDEFINED_HOSTNAME);
      host = UNDEFINED_HOSTNAME;
    }
    if ("0.0.0.0".equals(host)) {
      InetAddress localHost = InetAddress.getLocalHost();
      System.out.println("Using local host: " + localHost.getHostName());
      host = localHost.getHostName();
    }
    this.webServiceHost = host;
  }

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      System.out.println("Expected exception received: " + e.getMessage()) ;
      throw e ;
    }
    
    // get the value which should have been assigned a default
    InetAddress a = ((IPCHECK)protocol).getInetAddress1() ;
    System.out.println("value of inetAddress1 = " + a) ;
    
    InetAddress b = ((IPCHECK)protocol).getInetAddress2() ;
    System.out.println("value of inetAddress2 = " + b) ;
    
    InetAddress c = ((IPCHECK)protocol).getInetAddress3() ;
    System.out.println("value of inetAddress3 = " + c) ;
    
  }

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    inetAddressMap = Configurator.createInetAddressMap(protocol_configs, protocols) ;
        Collection<InetAddress> addrs=Configurator.getAddresses(inetAddressMap);
    Configurator.determineIpVersionFromAddresses(addrs) ;


    // get the value which should have been assigned a default
    InetAddress a = ((IPCHECK)protocol).getInetAddress1() ;
    System.out.println("value of inetAddress1 = " + a) ;
    
    InetAddress b = ((IPCHECK)protocol).getInetAddress2() ;
    System.out.println("value of inetAddress2 = " + b) ;
    
    InetAddress c = ((IPCHECK)protocol).getInetAddress3() ;
    System.out.println("value of inetAddress3 = " + c) ;
    
  }

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    protected static void makeUnique(Channel channel, int num) throws Exception {
        ProtocolStack stack=channel.getProtocolStack();
        TP transport=stack.getTransport();
        InetAddress bind_addr=transport.getBindAddressAsInetAddress();


        if(transport instanceof UDP) {
            String mcast_addr=ResourceManager.getNextMulticastAddress();
            short mcast_port=ResourceManager.getNextMulticastPort(bind_addr);
            ((UDP)transport).setMulticastAddress(InetAddress.getByName(mcast_addr));

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            if (!ipAddress.equals(ip)) {
                throw getExceptionAlreadyInUse("Locked by another computer: " + ip);
            }
            String port = p2.getProperty("port", "0");
            int portId = Integer.parseInt(port);
            InetAddress address;
            try {
                address = InetAddress.getByName(ip);
            } catch (UnknownHostException e) {
                throw getExceptionFatal("Unknown host " + ip, e);
            }

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                Socket client = socket.accept();
                Properties config = new ChainableProperties( server.getConfig() );
                Runnable runnable = createRunnable(client, config);
                if ( resolveHostName ) {
                    // after resolving, the host name appears Socket.toString.
                    InetAddress clientAddress = client.getInetAddress();
                    clientAddress.getHostName();
                }
                if( log.isLoggable( Level.INFO ) ) {
                    log.info( "Connection from: " + client.toString() );
                }
                server.post( runnable );

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     * Open a new new connection to the same address and port as this one.
     *
     * @return the new transfer object
     */
    public Transfer openNewConnection() throws IOException {
        InetAddress address = socket.getInetAddress();
        int port = socket.getPort();
        Socket s2 = NetUtils.createSocket(address, port, ssl);
        Transfer trans = new Transfer(null);
        trans.setSocket(s2);
        trans.setSSL(ssl);

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