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Table 39-9: The netstat Options Description Displays version information Displays information about raw sockets only Displays information about Unix domain sockets
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In some cases, you may want to assign a single Linux system that has only one network interface to two or more IP addresses. For example, you may want to run different Web sites that can be accessed with separate IP addresses on this same system. In effect, you are setting up an alias for your system, another address by which it can be accessed. In fact, you are assigning two IP addresses to the same network interface for example, assigning a single Ethernet card two IP addresses. This procedure is referred to as IP aliasing and is used to set up multiple IP-based virtual hosts for Internet servers. This method enables you to run several Web servers on the same machine using a single interface (or more than one on each of several interfaces). See s 23 and 24 for FTP and Web server information about virtual hosts, and 25 for Domain Name Service configuration. Setting up an IP alias is a simple matter of configuring a network interface on your system to listen for the added IP address. Your system needs to know what IP addresses it should listen for and on what network interface. You set up IP aliases using either Linuxconf or the ifconfig and route commands. For Linuxconf, select the IP aliases for virtual hosts under Server tasks. This opens a panel that lists available interfaces. Click one to open a panel where you can enter added IP addresses for it. To add another address to the same interface, you need to qualify the interface by adding a colon and a number. For example, if you are adding another IP address to the first Ethernet card (eth0), you would add a :0 to its interface name, eth0:0. The following example shows the ifconfig and route commands for the Ethernet interface 192.168.1.2 and two IP aliases added to it: 192.168.1.100 and 192.168.1.101. To add yet another IP address to this same interface, you would use eth0:1, incrementing the qualifier, and so on. The first ifconfig command assigns the main IP address, 192.168.1.2, to the first Ethernet device, eth0. Then, two other IP addresses are assigned to that same device. In the first route command, the network route is set up for the Ethernet device, and then routes are set up for each IP interface. The interfaces for the two aliases are indicated with eth0:0 and eth0:1:
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ifconfig eth0 192.168.1.2 ifconfig eth0:0 192.168.1.100 ifconfig eth0:1 192.168.1.101 route add -net 192.168.1.0 dev eth0 route add -host 192.168.1.2 dev eth0 route add -host 192.168.1.100 dev eth0:0 route add -host 192.168.1.101 dev eth0:1
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IP aliasing must be supported by the kernel before you can use it. If your kernel does not support it, you may have to rebuild the kernel (including IP aliasing support), or use loadable modules to add IP aliasing.
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40: Network Security: Firewalls, Encryption, and Authentication
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Most systems currently connected to the Internet are open to attempts by outside users to gain unauthorized access. Outside users can try either to gain access directly by setting up an illegal connection, by intercepting valid communications from users remotely connected to the system, or by pretending to be a valid users. Firewalls, encryption, and authentication procedures are ways of protecting against such attacks. A firewall prevents any direct unauthorized attempts at access, encryption protects transmissions from authorized remote users, and authentication verifies that a user requesting access has the right to do so. The current Linux kernel incorporates support for firewalls using the Netfilter (iptables) packet filtering package (the previous version, ipchains, is used on older systems). 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 help protect the network from outside attacks. To provide protection for remote communications, transmission can be simply 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. The SSH programs are meant to replace the remote tools such as rsh and rcp (see 21), which perform no encryption and include security risks such as transmitting passwords in clear text. In addition, Kerberos authentication provides another level of security whereby individual services can be protected, allowing use of a service only to users who are cleared for access. Table 40-1 lists several network security applications commonly used on Linux. Table 40-1: Network Security Applications Security Application Netfilter project, iptables, and NAT IP-Chains firewall Secure Shell encryption Squid Web Proxy server Kerberos network authentication
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