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You can set up connection configurations for any number of connections in the /etc/wvdial.conf file. To select one, enter its label as an argument to the wvdial command, as shown here:
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If you have a modem connected to your PC, it is connected to one of four communications ports. The PC names for these ports are COM1, COM2, COM3, and COM4. These ports can also be used for other serial devices, such as a serial mouse (though not for PS/2 mice). Usually, a serial mouse is connected to COM1 and a modem is connected to COM2, though in many cases your modem may be connected to COM4. Find out which ports your modem and mouse are connected to, because you must know this to access your modem. On the PC, COM1 and COM3 share the same access point to your computer; the same is true of COM2 and COM4. For this reason, if you have a serial mouse connected to COM1, you should not have your modem on COM3. You could find your mouse cutting out whenever you use your modem. If your mouse is on COM1, your modem should either be on COM2 or COM4. In Linux, you use the serial communication ports for your modem. Serial ports begin with the name /dev/ttyS, with an attached number from 0 to 3. (Notice the numbering begins from 0, not 1.) The first port, COM1, is /dev/ttyS0, and /dev/ttyS1 is the second port. The third and fourth ports are /dev/ttyS2 and /dev/ttyS3. In many Linux communication programs, you need to know the port for your modem, which is either /dev/ttyS1 for COM2 or /dev/ttyS3 for COM4. Some communication programs try to access the modem port using only the name /dev/modem. This is meant to be an alias, another name, for whatever your modem port actually is. If your system has not already set up this alias, you can easily create this alias using the ln -s command or the modemtool utility on Red Hat. modemtool has a GUI interface and is run on an X Window System desktop, such as Gnome or KDE. It displays four entries, one for each serial port. Click the one that applies to your system. You can also create an alias on the command line using the ln command. The following example creates an alias called modem for the COM2 port, /dev/ttyS1. If your modem port is /dev/ttyS3, use that instead. (You must be logged in as a root user to execute this command.) The following example sets up the /dev/modem alias for the second serial port, /dev/ ttyS1:
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Your /dev/mouse alias should already be set up for the port it uses. For a serial mouse, this is usually the COM1 port, /dev/ ttyS0. If the alias is not set up or if you need to change it, you can use the ln -s command. The following example sets up the /dev/mouse alias for the first serial port, /dev/ ttyS0.
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Once you have installed your Linux system, you should carry out some basic security measures to protect your system from outside attacks. Systems connected to the Internet are open to attempts by outside users to gain unauthorized access. This usually takes the following forms:
Trying to break into the system Having broken in, changing or replacing system files with hacked or corrupt versions Attempting to intercept communications from remote users Changing or replacing messages sent to or from users Pretending to be a valid user
Firewalls, intrusion protection, encryption, data integrity, and authentication are ways of protecting against such attacks (see 40 also).
A firewall prevents any direct unauthorized attempts at access. Intrusion protection checks the state of your system files to see if they have been tampered with by someone who has broken in. Encryption protects transmissions by authorized remote users, providing privacy. Integrity checks like modification digests guarantee that messages and data have not been intercepted and changed or substituted en route. Authentication methods such as digital signatures can verify that the user claiming to send a message or access your system is actually that person.
You can use encryption, integrity checks, and authentication to protect both messages you send as e-mail or files you attach. The GNU Privacy Guard encryption package lets you encrypt your e-mail messages or files you want to send, as well as letting you sign them with an encrypted digital signature authenticating that the message was sent by you. The digital signature also includes encrypted modification digest information that provides an integrity check, allowing the recipient to verify that the message received is the original and not one that has been changed or substituted. You will also need to check the integrity of your system to make sure that it has not already been broken into. With the Tripwire intrusion detection software, you can take a snapshot of your system, taking note of different features for critical files like size and permissions of configuration files. Later, you can check the current state of those critical files with your previous snapshot version to see if they have changed in any way. If they have, it may be evidence that an intruder has entered your system and is changing files. A good foundation for your network security is to set up a Linux system to operate as a firewall for your network, protecting it from unauthorized access. You can use a firewall to implement either packet filtering or proxies. Packet filtering is simply the process of deciding whether a packet received by the firewall host should be passed on into the local network. It checks the address of the packet and sends the packet on, if it's allowed. The firewall package
currently in use for Red Hat is Netfilter (iptables). Older releases of Red Hat (kernel 2.2 and below) use an earlier version called ipchains. To implement a firewall, you simply provide a series of rules to govern what kind of access you want to allow on your system. If that system is also a gateway for a private network, the system's firewall capability can effectively protect the network from outside attacks. Another way to protect access to your system is to provide secure user authentication with encrypted passwords, a Lightweight Directory Access Protocol (LDAP) service, and Pluggable Authentication Modules (PAM). These are discussed in detail in 30. User authentication can further be controlled for certain services by Kerberos servers, discussed in 40. To protect remote connections from hosts outside your network, transmissions can be encrypted. For Linux systems, you can use the Secure Shell (SSH) suite of programs to encrypt any transmissions, preventing them from being read by anyone else. If you don't use SSH, it is best to avoid the standard remote communications tools such as telnet and rcp (see 21) for remote access over an unprotected networks like the Internet. Outside users may also try to gain unauthorized access through any Internet services you may be hosting, such as a Web site. In such a case, you can set up a proxy to protect your site from attack. For Linux systems, use Squid proxy software to set up a proxy to protect your Web server (see 27). This chapter will show you some simple steps you can take to provide a basic level of security. The GNU Privacy Guard encryption and Tripwire intrusion detection software are covered in detail. Netfilter, Squid, and SSH are covered briefly (see s 27 and 40 for a more detailed analysis of these applications). Table 6-1 lists security applications used on Red Hat systems. Note Numerous older security applications are also available for Linux such as COPS (Computer Oracle and Password System) to check password security; Tiger, which scans your system for unusual or unprotected files; and SATAN (Security Administration Tool for Analyzing Networks), which checks your system for security holes. Crack is a newer password auditing tool that you can use to check how well your password security performs under dictionary attacks.
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