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In part 5, the source completes the three-way handshake by sending a TCP ACK, shown in Figure 5-5 The appliance first compares packet information to the existing connections to the state table to determine if the packet is a new or part of an existing connection Since it is an existing connection, it should be in the state table The appliance then compares the packet header information with the existing translation entries in the translation table to see if an existing translation can be used or if a new one needs to be created Again, this packet information should be there, and the appliance uses the existing translation to translate the source address from 100111 to 192168020 The appliance then randomizes
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Inside Network Source Address 100111 50000 23 49001 90001 ACK Destination Address 172262650 Source Port Destination Port Initial Sequence No ACK 100111 Flag Part 5
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Incoming packet: 1 Check state table for existing entry found 2 Check for an existing translation in xlate table found 3 Randomize the TCP sequence # 4 Decrement the embryonic connection counter 5 Reset the idle timer for the conn and xlate
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Outside Network 192168020 172262650 50000 23 70001 90001 ACK Part 6 172262650
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Figure 5-5 Last step in TCP s three-way handshake
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the TCP sequence number and updates the conn table with this information Since the connection has completed the three-way handshake, the appliance decrements the embryonic connection counter If you examine the Outside Network column above part 2, this shows the packet header as it leaves the appliance Notice that the source address was changed because of a match on the configured translation policy, and the TCP sequence number was randomized The corresponding idle timers in the conn and state tables are reset, and the packet is forwarded to the destination, shown in part 6 Again, the appliance keeps track of the packets for the connection and updates the conn table appropriately If no packets are seen for the duration of the idle timer or the connection is torn down by the source or destination, the entry is removed from the conn table NOTE You will see in later chapters that a lot more is going on than what was described in this section to handle a connection through the appliance Other chapters add to this, but 10 covers it more thoroughly
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Address Translation
ADDRESS TRANSLATION OVERVIEW
One of the many issues that you will have to deal with in your network is the assignment of addresses to all of your networking devices Because of the shortage of public IPv4 addresses, in many cases you will have to use private addresses for your internal devices As you will see in the following sections, however, private addresses, even though they allow all of your devices to communicate via TCP/IP, also create problems I will first provide an overview of private addresses and outline the pros and cons of using private addresses; then I will discuss how the appliances deal with the translation of IP addresses
Private Addresses
To address the shortage of addresses, and to accommodate the growing need for connecting companies to the Internet, the Internet Engineering Task Force (IETF) developed RFC 1918 Table 5-2 lists the private addresses assigned in RFC 1918 for IPv4 As you can see from the addresses listed in Table 5-2, you should have more than enough addresses to meet the internal address needs of any company Each of the devices in your network can be given a unique address RFC 1918, however, defines one restriction: a packet containing a private address in either the source or destination IP address fields cannot be forwarded to a public network Imagine two companies, Company A and Company B, that both use 10000/8 for their internal addressing and for communicating with each other, as shown in Figure 5-6 Obviously, this will create many problems because both companies may have overlapping network issues each company might be using the same subnet numbers In this situation, the overlapping subnets would not be able to communicate with each other For example, both companies might have a 10110/24 subnet, as shown in Figure 5-6 Within their own companies no connectivity issues arise, but as soon as these two subnets need to reach each other, they will be unable to The boundary router between these two networks will have a dilemma when trying to reach 10110/24 does it forward traffic to Company A or to Company B
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