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Every computer system needs to have some sort of console A console acts as a master terminal, often allowing access even when all other system resources are down Boot messages and other critical startup information appear on the console screen The problem, though, with fixed, attached consoles is that they make it very difficult to perform system maintenance, such as reboots, without being in the same room as the system If a system requires emergency work in the middle of the night (or any other time), fixed consoles require that your system administrators get in the car and visit the data center If your operating system supports text-based consoles, connect a terminal server as your console, rather than a fixed and local console GUI consoles, such as Windows operating systems generally require, are not practical for remote system management.

CHAPTER SECTIONS: 1 / 2 / 3 / 4 / 5 / 6 / 7 / 8 / 9

file:///D|/Downloads/Livros/computa o/Computer%20Net-Down%20Approach%20Featuring%20the%20Internet/ppphtm (4 of 7)20/11/2004 15:52:42

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Text-based consoles enable your system administrators to access systems from anywhere in the world, at any time of the day or night Few things are more frustrating to a system administrator than having to get up at 3:00 AM on a Sunday morning and drive to the office to repair a down server, only to discover that a single command she could have given to someone over the phone, or typed in herself, would have fixed the problem If she could have logged in from home, the system would have been back online faster, and she could have gone right back to sleep It s also wise if your system administrators have high-speed network access from their homes; such a program will probably pay for itself the first time that a system administrator is able to bring a system up from home without having to drive to the office.

Thus far, we have seen how PPP frames the data being sent over the point-to-point link But how does the link get initialized when a host or router on one end of the PPP link is first turned on The initialization, maintenance, error reporting, and shutdown of a PPP link is accomplished using PPP's Link Control Protocol (LCP) and family of PPP network control protocols Before any data is exchanged over a PPP link, the two peers (one at each end of the PPP link) must first perform a considerable amount of work to configure the link, in much the same way that a TCP sender and receiver must perform a threeway handshake (see Section 34) to set the parameters of the TCP connection before TCP data segments are transmitted Figure 58-3 illustrates the state transition diagram for the LCP protocol for configuring, maintaining and terminating the PPP link

Many Net-savvy people are aware of a simple trick that allows users to forge electronic mail. This is accomplished by talking directly to the SMTP daemon on port 25 of a server machine. The mail-forging attack takes advantage of the fact that mail-serving hosts monitor port 25 for incoming Simple Mail Transfer Protocol (SMTP) messages. One of the Internet rites of passage is to telnet to port 25 and send fake mail to a friend. This game is very well known; however, the scheme is easily debunked. The SMTP daemon actually marks the forged mail with the IP number of the machine that connected to port 25, which makes it very easy to discern which machine sent the mail.3 Spammers often forge mail headers so that the true source of a spam message is hard to discern. It is usually easy to detect forged mail by looking carefully at the header. The machine listed in the From line should be the same as the Received: line. Most users and mail readers look only at the From line; systems people know to look at both. Note that some legitimate mail may have differing From and Received: lines, depending on how people send their mail. Here is an example of mail forged by an author on his home machine (tigger.mediasoft.net) to his own work account. Note how the From and Received: lines differ.

Of course, if you arrange for network access to system consoles, you open up a potential security hole Be sure to enforce good passwords on the terminal server ports to keep out intruders Otherwise, some of these reliability measures will come with undesired side effects It is best to enforce the use of tools like ssh to encrypt traffic that flows across otherwise unprotected networks If your server has a CD-ROM drive on it (and don t they all nowadays ), and it isn t being used for anything else, keep a copy of the operating system CD in the drive Then, if it becomes necessary to reboot the system from the CD, nobody need visit the system to get it ready This also helps keep track of where your operating system CDs are; lost OS CDs are a common factor in increased MTTRs.

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