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The gateway represents where to send traf c that matches the network and netmask, the interface shows which address in the computer the route represents (127001 is the loopback), and the metric shows the route s priority (the lower the metric the higher its priority) The most speci c route is chosen rst, and so the default is only used if no other route can be found In the old days of Windows 2003 and earlier, the metric was based on a basic list of network speeds (see Table 6-1) Table 6-1 Link Speed Metrics
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Greater than 200Mb Greater than 20Mb and less than or equal to 200Mb (Windows XP SP2 introduced a separate metric of 25 for 20 80Mb, with 80 200Mb being 20) Greater than 4Mb and less than or equal to 20Mb Greater than 500Kb and less than or equal to 4Mb Less than or equal to 500Kb
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10 20 30 40 50
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With Windows Vista and Windows Server 2008, the metric is not as neat and uses a far more complex algorithm to de ne the metric, but it is still based on network speed To set the metric manually, click the Advanced button on the TCP/IP properties of the adapter On the IP Settings tab, click Edit for the gateway and unselect Automatic Metric Con gure your own value, as shown in Figure 6-11
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NOTE Although you can change the metrics, ensure sensible values are selected Wrong metrics change how traf c is routed, potentially causing undesirable results You might change a metric if you want a particular route to be used or not used, and the modi ed metric would depend on the metric of other routes that exist on the system
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6 TCP/IP
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FIGURE 6-11 Changing the default metric location You can statically add routes if required If a computer has multiple network cards, and you want to de ne if a certain NIC can be used to reach a certain network, add a route Adding routes is accomplished with the route command, and help is available by typing route without any parameters:
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route ADD 19216850 MASK 2552552550 5 IF 7 1921681100 METRIC
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This says to get to network 1921685/24 and go via gateway 1921681100 on interface (IF) 7 (The list of interfaces is listed at the top of the route print command)
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Every computer and any device that wants to communicate via IP in an environment needs an IP address So if a company has 1,000 users, it needs at least four class C networks (possibly more based on the number of servers, printers, photocopies, and sh webcams on the network) Class C networks range from 192 to 223, giving you 32 networks each with around
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65,000 class Cs That means just over two million class C networks are available for companies to buy Now do you see the problem with IPv4 There aren t enough addresses, and the routing tables on the Internet would be impossibly large IPv4 was intended for a speci c purpose and scope of machine, and not for something the size of today s Internet IPv6 was created to address this by giving us 128-bit addresses, meaning everything can have an IP address (including the cat), and you would never run out IPv6 is radically different, though, and has had little chance of being adopted quickly Around the same time, two other technologies were widely implemented: Dynamic Host Control Protocol (DHCP) and Network Address Translation (NAT) DHCP is a service that gives clients IP addresses dynamically NAT allows a single Internet address to be shared by all the computers in an organization
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You might have seen an address starting with 169254 What is this With Windows 2000, Microsoft tried to make it as easy as possible to set up TCP/IP on a small network, and by default machines were set up to use DHCP A very small network might not have a DHCP server or cable modem to give out addresses Rather than failing to initialize TCP/IP, Microsoft added code so that the machines use an address not in use on the local network in the class B address range: 169254xx This IP address range is reserved for internal use only and so should not clash with any real IP addresses on your network Automatic address allocation uses con ict detection via a NetBIOS naming broadcast, so each machine gets an IP address from the 169254xx range that is not in use The actual address initially chosen is random If any of your machines have a 169254xx address, it just means they could not contact a DHCP server, so check your network connectivity This automatic IP addressing is known as Automatic Private IP Addressing (APIPA) and is commonly referred to as a private IP addressing
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