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As a simple example, a filter can be set to block all UDP segments and all Telnet connections Such a configuration prevents outsiders from logging onto internal hosts using Telnet, insiders from logging onto external hosts using Telnet, and "weird" UDP traffic from entering or leaving the internal network The router filters the UDP traffic by blocking all datagrams whose IP protocol field is set to 17 (corresponding to UDP); it filters all Telnet connections by blocking all TCP segments (each encapsulated in a datagram) whose source or destination port number is 23 (corresponding to Telnet) Filtering of UDP traffic is a popular policy for corporations -- causing much chagrin to leading audio and video streaming vendors, whose products stream over UDP in the default mode Filtering Telnet connections is also popular, as it prevents outside intruders from logging onto internal machines A filtering policy can also be based on the combination of addresses and port numbers For example, the router can forward all Telnet packets (port 23) except those going to and coming from a list of specific IP addresses This policy permits Telnet connections to and from hosts on the list It is highly recommended to reject all datagrams that have internal source IP addresses -- ie, packets that claim to be coming from internal hosts but are actually coming in from the outside These packets are part of address spoofing attacks, whereby the attacker is pretending to be coming from an internal machine Unfortunately, basing the policy on external addresses provides no protection from an external host claiming to be a different external host Filtering can also be based on whether or not the TCP ACK bit is set This trick is quite useful if an organization wants to let its internal clients connect to external servers, but wants to prevent external clients from connecting to internal servers Recall from Section 34 that the first segment in every TCP connection has the ACK bit set to 0 whereas all the other segments in the connection have the ACK bit set to 1 Thus, if an organization wants to prevent external clients from initiating connections to internal servers, it simply filters all incoming segments with the ACK bit set to 0 This policy kills all TCP connections originating from the outside, but permits connections originating internally Now suppose an organization doesn't want to block all connections originating from outside; instead it just wants to block only the Telnet connections originating from outside How can filtering accomplish this task To see how filters handle this, let's look at how the fields are set for Telnet connections.

PATH=%PATH%;C:\nos Before attempting to sign anything, check to see if signtool is able to locate the certificate that will be used to sign objects Unix flavors of signtool look for certificates in the $HOME/netscape If your local Netscape files are kept somewhere else, or if you are using the Win32 version, signtool must be explicitly told the path to the certificates This is done with the -d flag On Win32, this path is commonly c:\Program Files\Netscape\Users\name, where name is the name of your Netscape Profile To verify that your signing certificate was installed properly, run signtool -l or, if your certificate cannot be found, signtool -d"<path to certificates>" -l For example, if your certificates were stored in C:\nos, you would type: signtool -d"C:\nos" -l If your certificate still does not appear in the listing, verify that the certificate is installed in Netscape properly (See the instructions given earlier).

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If you are not an experienced presenter, it is best to practice your presentation several times in front of a video camera or, even better, in front of friends who will be honest with you about the strengths and weaknesses of the presentation and your delivery style If you are very uncomfortable presenting, perhaps one of your allies has more presentation experience and would be willing to do it instead In presentations such as these, it is best to stay away from jokes and animated slides They distract from your main message, and the wrong kind of joke could offend someone you are trying to impress Avoid negative statements Don t insult people, products, processes, or companies Be positive Remember that you are there to help make the company money, which can make everyone in the room more successful.

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If you believe in what you say and can show some enthusiasm and confidence, you ll have an excellent chance of success..

originating internally and Telnet connections originating externally (Table 851):

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