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Securing a Router by Access Lists Before we start building the configuration for this elementary firewall router, let s review the construction of a Cisco access list IP access lists are either regular if numbered between 1 and 99, or extended if numbered between 100 and 199 A regular access list enables you to permit or deny traffic based on the source node or network address An extended list is much more sophisticated, and enables you to restrict traffic based on protocol, source, and destination, and to allow established connections Allowing established connections is useful, for example, if you want hosts on the internal side of the router to be able to establish a Telnet session to a host on the external side, but do not want an external host to have the ability to establish a Telnet session with an internal host When configured for established connections, a router will allow a TCP connection into the internal network only if it is part of a conversation initiated by a host on the internal network An access list will execute each line in order, until either a match for the packet type is found, or the end of a list is reached and the packet is discarded With this type of processing, the sequence of access list entries is important To keep things simple, all permit statements should be entered first, followed by deny statements At the end of every access list is an unseen, implicit deny statement that denies everything This makes sense, as typically you will want to allow a certain type of access through an interface and deny all others The implicit deny saves you the bother of having to end all your access lists with a deny-everything statement Let's consider what we want to do with the access list for the router in Fig 7-11 Assuming that the external network is the Internet, we want to allow external users to establish TCP connections to the information server for HTTP access to Web pages, Telnet, and SMTP sessions for mail, and allow UDP packets to pass for DNS traffic Let's look at how each connection is established and how we will code these restrictions into the router's access list HTTP, Telnet, and SMTP all use TCP as the Transport layer protocol, with port numbers 80, 23, and 25, respectively The port numbers listed are the port numbers that the host daemon program listens to for requests When a client PC wants to establish an HTTP session with a Web server, for example, it will send a TCP request destined for port 80 addressed to the IP number of the Web server The source port number used by the client PC is a random number in the range of 1024 to 65,535 Each end of the communication will be identified with an IP address/port pair In this configuration, we are not concerned with restricting packets going out onto the Internet; we are interested only in restricting what comes in To do that, we create an accesslist that permits connections using TCP ports 80, 23, and 25 to the IP address of the information server only, and apply that access list to packets inbound on the Serial 0 port of router 1 The access list is created in global configuration mode as follows: access-list 101 permit tcp 0000 255255255255 200113 0000 eq 80 access-list 101 permit tcp 0000 255255255255 200113 0000 eq 23 access-list 101 permit tcp 0000 255255255255 200113 0000 eq 25 The 0000 255255255255 in each line allows any source address The 200113 0000 allows only packets destined for IP address 200113 Had the mask been set to 000255, that would have allowed through any packets destined for the 200110 Class C network.

Just as with any RF circuit, a good impedance match between the transmitter, the feed line, and the antenna is important for the maximum transfer of power A proper match will also stop the energy generated at the transmitter from being reflected back into its output, which can produce severe transmitter damage and transmission line insulation breakdown This match between the transmitter, its feed line, and the antenna (Fig 1018) will occur when the inductive reactances equal the capacitive reactances and cancel, leaving only the resistances (which must equal each other), allowing maximum power to be radiated from the antenna This prevents standing waves from being created (see Sec 14, Transmission Lines ) on a mismatched transmission line, with much of the reflected power then being given up as heat So, when the antenna is resonant and the impedances all match between the transmitter, feed line, and antenna, maximum alternating current is sent into the antenna and broadcast as an RF signal However, on the antenna itself, maximum output power will be possible only if there are maximum standing waves This will create maximum voltage at the ends of the antenna and maximum current in the center as shown in the diagram of the dipole antenna of Fig 1019 Since the power of the RF signal radiated from an antenna is also contingent on the RF currents in the antenna, the more current the higher will be the output power But for the energy to actually break free of the antenna and radiate far into space, the frequency must reach a point where the field lines (created by the RF currents) cannot fall back into the antenna s elements before the RF currents change polarity The minimum frequency at which this can occur is approximately 30 kHz

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Downloaded from Digital Engineering Library @ McGraw-Hill (wwwdigitalengineeringlibrarycom) Copyright 2004 The McGraw-Hill Companies All rights reserved Any use is subject to the Terms of Use as given at the website

AS A MATTER OF FACT You should find a copy of Adobe Acrobat Reader on the Photoshop Elements install CD-ROM; anyone can download this free software from the Adobe web site: wwwadobecom/products/acrobat/readstep2html

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