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Other TCP/IP Enhancements
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In this section, we will cover other enhancements to the TCP/IP suite, such as classless addressing, private addressing, ports, and network address translation With the sole exception of CIDR, these topics are used daily in nearly all TCP/IP environments (Cisco or not), and will be required in order to fully understand some of the topics in later chapters
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Classless interdomain routing (CIDR) is pretty similar to VLSM in concept CIDR is used for public addresses now because of the shortage of available public IP addresses CIDR practically eliminates the idea of class-based networks in favor of address spaces defined only by the mask The initial purpose of CIDR was to allow ISPs to hand out smaller or larger chunks, or blocks, of IP addresses than a given class For instance, if you get a T1 Internet connection, your ISP will probably hand you a block of public IP addresses to go along with it They may hand you as few as 2 or as many as 64, depending on your needs You can also request (and usually pay a fee for) additional public addresses if needed, and they will proportion you out a block of their address space as necessary The way this works is fairly simple If you told your ISP that you needed 25 public IP addresses, they would look at their address space and may find that the range from 6490132 to 6490163 is available They would then issue you the network address 6490132/27 With this address block, you now have 30 valid IP addresses, from 6490133 to 6490162 You don't have the full class A Your ISP owns that You just have a piece of their address space to use until such time as you switch ISPs The basic idea of CIDR is to forget about the class Just realize that if your ISP hands you a 22-bit mask, you cannot make that mask any smaller (use less bits), even if the IP address you are given is a class A You don't own the entire class; you are just being allowed to use the specific section of the address space that has been given to you You can make the mask larger (use more bits) and subnet your section of the address space to your heart's content; however, just make sure you use only the addresses that have been assigned to you
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This section discusses TCP and UDP ports While most books will not call this layer 4 addressing because technically they aren't addresses, I feel the term fits Ports are identifiers, just like addresses; but rather than identifying a host, like an address, they identify an application on that host For example, have you ever been surfing the Web and had a couple of browser windows open at once Did you ever wonder how the PC kept track of which web page was supposed to open in which browser I mean, think about it like this: if you have the same web site open in two different browser windows and you click the Search button in one of them, when the PC receives the packets to bring up the search page, how does it know whether the page in question should appear in browser window #1 or #2, or in both It uses port numbers to identify each instance of the application To give you an analogy, imagine a house Now imagine that 500 people are living in the house but only one mailing address is used Now imagine that no one put names on envelopes, just addresses, because it is assumed that every individual person has a separate
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mailing address If you had 500 people living with you in this house, when you went out to check your mail every day, what would you have to do That's right, you would not only have to sort through all of the mail, but because there are no names on the envelopes, you would have to open every piece of mail and read it to find out whom it was destined for! This is like a PC without ports The PC would have to take messages destined for 500 different applications all arriving at the same address, and read a bit of each of them to determine whether it should send them to Outlook, Ping, or Internet Explorer With ports, the PC does what you would probably do in the house analogy Whereas you would probably put up separate mailboxes, each with the same address but different apartment numbers, the PC puts up different ports, each with the same address, but with different port numbers Therefore, if a PC is a web server and a Telnet server, it sets port 23 to be the incoming port for Telnet, and port 80 to be the incoming port for HTTP So, if something comes in on port 80, the PC assumes the data is for the web server TCP and UDP each have 65,536 ports (0 65,535) Ports 0 through 1023 are considered wellknown ports These numbers are managed by the IANA and should not be changed Your most common server-side network applications use specific ports in this range by default Table 6-3 provides a brief list of the most common ports Table 6-3: Some Common TCP Ports Protocol FTP Data FTP Control Telnet SMTP DNS BOOTP Server BOOTP Client Finger HTTP POP3 NNTP (Network News Transfer Protocol) NBNS (NetBIOS Name Service) IMAP (Internet Message Access Protocol) SNMP SNMP Trap IRC (Internet Relay Chat) HTTPS (HTTP over SSL)
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