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We can see the path of the packets leaving the router (gate) and traveling three hops (2 4) to the final destination The packets go through the various hops without being blocked From our earlier work, we know that the MX record for Acmenet points to gateacmenet Thus, we can assume this is a live host and that the hop before it (4) is the border router for the organization Hop 4 could be a dedicated application-based firewall, or it could be a simple packet-filtering device we are not sure yet Generally, once you hit a live system on a network, the system before it is a device performing routing functions (for example, a router or a firewall) This is a very simplistic example But in a complex environment, there may be multiple routing paths, that is, routing devices with multiple interfaces (for example, a Cisco 7500 series router) Moreover, each interface may have different access control lists (ACLs) applied In many cases, some interfaces will pass your traceroute requests, while others will deny it because of the ACL applied Thus, it is important to map your entire network using traceroute After you traceroute to multiple systems on the network, you can begin to create a network diagram that depicts the architecture of the Internet gateway and the location of devices that are providing access control functionality We refer to this as an access path diagram It is important to note that most flavors of traceroute in UNIX default to sending User Datagram Protocol (UDP) packets, with the option of using Internet Control Messaging Protocol (ICMP) packets with the I switch In Windows NT, however, the default behavior is to use ICMP echo request packets Thus, your mileage may vary using each tool if the site blocks UDP vs ICMP and vice versa Another interesting option of traceroute includes the g option that allows the user to specify loose source routing Thus, if you believe the target gateway will accept source-routed packets (which is a cardinal sin), you might try to enable this option with the appropriate hop pointers (see man traceroute in UNIX for more information) There are several other switches that we need to discuss that may allow you to bypass access control devices during our probe The p n option of traceroute allows you to specify a starting UDP port number (n) that will be incremented by 1 when the probe is launched Thus, we will not be able to use a fixed port number without some modification to traceroute Luckily, Michael Schiffman has created a patch (http:// wwwpacketfactory net/Projects/firewalk/traceroutediff) that adds the S switch to stop port incrementation for traceroute version 14a5 (ftpceriaspurdueedu/pub/tools/unix/netutils/traceroute/ old/) This allows you to force every packet we send to have a fixed port number, in the hopes that the access control device will pass this traffic A good starting port number.

Creating a Customer Workspace Customizing Workspaces Exploring the Project Manager Working with the Document Library Creating a Discussion Board Creating a Survey Collaborating with Vendors Project Manager Adding Lists How to Do It

Customizing Page Layout Setting New Page Margins Adjusting Page Orientation Changing Paper Size Working with Tabs Creating a Tabbed List Using Word s Default Tabs Setting Tabs from the Ruler Using the Tabs Dialog Box Setting Up Multiple Tabbed Lists in a Single Document Editing Tab Settings Adjusting Tab Positions Changing Tab Stop Alignment CHAPTER 7 119 119 120 121 122 122 122 123 125 126 126 126 127

would be UDP port 53 (DNS queries) Since many sites allow inbound DNS queries, there is a high probability that the access control device will allow our probes through

Inserting and Formatting Page Numbers Working with Headers and Footers Inserting Header and Footer Content Creating a Table of Contents Searching for and Replacing Document Content Using Find to Move Through a Document Replacing Text Replacing Special Codes Working with Columns Building a Newsletter Document Applying Columns to Existing Text Setting Up Columns Before Typing Customizing Columns Setting Up Multiple Column Configurations in One Document

156 157 158 161 166 169 171 172 172 174

[bash]$ traceroute 1010102 traceroute to (1010102), 30 hops max, 40 byte packets 1 gate (192168101) 11993 ms 10217 ms 9023 ms 2 rtr1bigispnet (10101213)37442 ms 35183 ms 38202 ms 3 rtr2bigispnet (10101214) 73945 ms 36336 ms 40146 ms 4 hssitrtbigispnet (10113114) 54094 ms 66162 ms 50873 ms 5 * * * 6 * * *

130 131 132 134 135 135 136 136 137 138 139 140 141 142

We can see here that our traceroute probes, which by default send out UDP packets, were blocked by the firewall Now let s send a probe with a fixed port of UDP 53, DNS queries:

Getting Started with Project Manager Component Lists Creating a New Project Setting Up a Schedule Setting Up an Alert Delegating Tasks to Employees Tracking Project Issues and Problems Recording Issues Setting Up Filters Getting Specific About Categories How to Do It

This book covers the five applications that are part of the Office 2003 suite: Word, Excel, PowerPoint, Access, and Outlook The workspaces you see in Word, Excel, and PowerPoint are very much the same, and you ll have little or no trouble transferring what you ve learned about one to another If, for example, Word is your primary application, you ll find it very easy to learn Excel and PowerPoint as well as to find tools for common activities such as opening, saving, and printing files You ll find that among these three applications, the only differences in their workspaces are the features specific to these applications, as shown in Figures 2-1, 2-2, and 2-3 When it comes to Access and Outlook, the menus and toolbars are quite different from the ones in the other applications, mainly because Access and Outlook are so vastly different in terms of how they work and what they do The Access and Outlook toolbars are entirely specific to what these applications do that is, they maintain a database of information and keep track of contacts and appointments, respectively When it comes to Access (shown in Figure 2-4), once you have an understanding of database management and how a relational database-management application works, what it does, and so on, you ll find the Access workspace more intuitive as well In the case of Outlook (see Figure 2-5), you ll find that although the workspace and tools are very different from those in Word, Excel, and PowerPoint, the features are so familiar that you ll have no trouble learning the application, even if you re someone who has been keeping track of people and places manually

[bash]$ traceroute -S -p53 1010102 traceroute to (1010102), 30 hops max, 40 byte packets 1 gate (192168101) 10029 ms 10027 ms 8494 ms 2 rtr1bigispnet (10101213) 36673 ms 39141 ms 37872 ms 3 rtr2bigispnet (10101214) 36739 ms 39516 ms 37226 ms 4 hssitrtbigispnet (10113114)47352 ms 47363 ms 45914 ms 5 1010102 (1010102) 50449 ms 56213 ms 65627 ms