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in the command history Backspace or DEL Either of these keys deletes the character before the cursor Tab or Enter Each of these keys executes the command entered The Key Possibly the most useful key in the user interface, the " " key, can be entered at any time to find out what can be entered next This is best illustrated with an example: Hostname>show ip route bgp Connected egp eigrp igrp isis ospf rip static summary supernets-only Hostname>show ip route After the question mark is entered, the router informs you of the options available to complete the command, and re-enters the command typed in so far, so that all you need to do is select the appropriate option As soon as you see a <cr> option in the available command listing, you know that you can press the Enter key and the router will execute the command A point to note here is that if the list of options extends past one screen, the last line of the display will show More Pressing the keyboard space bar will show the next page of information, and pressing the Enter key will show the next single line of information The following key combinations illustrate useful commands: <Ctrl-A> <Ctrl-B> <Ctrl-D> <Ctrl-H> Move cursor to beginning of line Move cursor back one character Delete the character the cursor is on Same as backspace, ie, delete the character before the cursor Press the Enter key Border Gateway Protocol Connected networks Exterior Gateways protocol Enhanced Interior Gateway Routing Protocol Interior Gateway Routing Protocol ISO is-is Open Shortest Path First Routing Information Protocol Static routes summary of all routes show supernet entries only

255 11111111 0 11000000 0 00000000 0 00000000

Notice that the two bits that are now enabled are in the second octet Also notice that you always work from left to right, except for that little cheat method you saw earlier for calculating the number of bits required to mask That cheat is just to get the number of bits to work with but once you actually work with the bits, you always work from left to right The next thing you want to do is convert all those octets to decimal values again; then you will have the new subnet mask of the two networks (subnets) we are building If you convert the new binary value in the preceding table of 11111111110000000000000000000000, you should get 25519200 as the new subnet mask of your two new subnets Write that number down because it will be needed later The next step is to calculate the IP ranges for the two different networks, but before that, you should be aware that there are five pieces of information you should know about each network when your calculations are over These five pieces of information are

As we have seen, Cisco access list language is very similar to our computer language example One major difference between the Cisco implementation and the above pseudo-language is the requirement to use the layer 3 address instead of the device name This policy implemented in Cisco ACL language would be Access-list 101 permit TCP any host abcd eq http Access-list 101 permit TCP any any established (implicit deny all) interface serial 0 IP access-group 101 in NoteThe abcd is used merely as placeholder to indicate where an actual IP address would reside (In an actual implementation, an IP address would be used) Note a few things from this example First, there is no statement permitting outbound packets; it's not necessary because Cisco access lists are applied in a particular direction on an interface The direction is important because it refers to the direction of packets from the routers' perspective In this example, the packets are arriving at the serial 0 interface from another router, so they are arriving "inbound" If the packets are leaving the routers serial 0 interface, the access list would be applied "outbound" In the above example, because the ACL is applied inbound, it does not affect any traffic in the outbound direction (traffic leaving the serial interface) Also notice the use of the keyword "established" This keyword is the Cisco method for allowing return traffic It checks for the existence of an ACK or RST flag in the TCP packet Recall from 4, "TCP and UDP," that these flags are used by TCP for flow control purposes If one of these bits is turned on, it usually means that the packet is part of an ongoing conversation We use the caveat "usually" because it is fairly easy for an attacker to write code to manipulate this flag and send packets with the ACK or RST bit turned on that are not part of a legitimate ongoing conversation As such, the use of the established keyword is by no means a foolproof method for determining whether a packet is part of an existing conversation or not.

10 10 10 10 10

In this chapter we will examine: How we can use Cisco routers to transport protocols other than TCP/IP Network protocols included in corporate networks, such as Novell NetWare's IPX, the IBM SNA protocols, and Windows NT NetBEUI An overview of how bridging technology is implemented on Cisco routers The approach will be to give an overview of each technology, discuss integrating each protocol into a TCP/IP environment, and then give configuration examples of how to implement these protocols on Cisco routers

second octet (binary)

0 00000000 01111111 10111111 11000000