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A communication to a given destination (known as destination IP) A communication to a given destination from a specific host (known as source destination IP) A communication to a given destination from a specific host using specific layer 4 protocols and port numbers (known as IP flow) Note Flows are unidirectional That is, if PC1 sends a packet to PC2, the packet stream from PC1 to PC2 is a single flow If PC2 responds back to PC1, that is classified as a separate flow

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IPv6 s huge address space makes such scanning programs obsolete Let s say you knew my subnet was 2001:d0be:7922:1/64 There are 264 different possible IP addresses on this subnet Assuming a scanner could check one million addresses/second, it would take something like 580,000 years to check them all If a bad guy knows your address, the hope is that you ll be using IPSec to prevent other people from reading your information Otherwise, there are a number of other security options that aren t specific to IPv6 that you can use Some of these, like encryption, you ve seen in earlier chapters Others, like good firewalling, you ll see in 17, Protecting Your Network

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The type of flow used by the switch (known as the MLS-SE, or multilayer switchingswitching engine) is known as the flow mask In most cases, the switch uses the destination IP mask However, if you are using access lists (discussed later in this section, as well as in 27), or if you need more specific accounting or logging data (in other words, you want to know who is eating up all of your bandwidth and which application they are using), you may choose to use one of the other masks The flow mask is primarily used to determine which information about flows is entered into the switching cache (known as the MLS cache) For instance, in Figure 20-2, PC1 (19216811) is communicating with Server1 (10111) through a layer 3 switch For the first packet, the layer 3 switch notices that the destination MAC is for the router, so it looks in its MLS cache for the destination IP address

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Pointers provide necessary support for C/C++'s dynamic allocation system Dynamic allocation is the means by which a program can obtain memory while it is running As you know, global variables are allocated storage at compile time Local variables use the stack However, neither global nor local variables can be added during program execution Yet there will be times when the storage needs of a program cannot be known ahead of time For example, a program might use a dynamic data structure, such as a linked list or binary tree Such structures are inherently dynamic in nature, growing or shrinking as needed To implement such a data structure requires that a program be able to allocate and free memory

Figure 20-2: The MLS-SE cannot find the destination in the MLS cache Because an MLS entry was not found for the destination IP address, it forwards the packet to the router (known as the MLS-RP, or multilayer switching-route processor) for processing (shown in Figure 20-3)

DHCP is alive and well in the IPv6 world, but works very differently than IPv4 s DHCP At first glance you d think you wouldn t need DHCP anymore IPv6 clients get their IP address and subnet from their gateway router s advertisements (so they also know the default gateway) This is true, but IPv6 router advertisements do not pass out a number of other very important bits of information that clients need, such as DNS server information, giving DHCP a very important place in IPv6 NOTE We call IPv6 s DHCP servers DHCPv6 to separate them from IPv4 DHCP servers

Figure 20-3: The MLS-SE forwards the packet to the MLS-RP The router routes the packet and forwards it back to the MLS-SE (switch), which adds the destination to the MLS cache (shown in Figure 20-4) Because this example is using only the destination IP flow mask, the only information added is the destination IP, destination MAC address, and destination port

A fully functional DHCPv6 server works in one of two modes: stateful or stateless A stateful DHCPv6 server works very similarly to an IPv4 DHCP server, passing out IPv6 addresses, subnet masks, and default gateways, as well as optional items like DNS server addresses A stateless DHCPv6 server only passes out optional information Figure 13-15 shows the DHCPv6 server on Windows Server 2008

Figure 20-4: The MLS entry added to the MLS cache When PC1 sends the next packet, the MLS-SE looks in its cache, finds the entry for the destination, and rewrites the packet with the new information, without all of the additional overhead associated with routing the packet See Figure 20-5

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