OSPF ASE 150 BGP 170 EGP 200 Given the preference values in Table 7.1, a route through a network interface to a directly connected network is the most-preferred route; and a route learned from EGP, an obsolete exterior routing protocol, is the least-preferred route. OSPF is listed in the table twice. OSPF ASE routes were learned by OSPF from an external autonomous system. Because the ASE routes come from another routing domain, the metrics in those routes do not receive the same level of trust as the metrics in interior routes. In fact, the three lowest-preference routing sources EGP, BGP, and OSPF ASE all get the routes from external routing domains. You can modify these default preferences when you configure gated, but you probably won’t need to. The defaults work well for most configurations. In part, this is because a general-purpose system such as Linux isn’t used for extremely complicated and demanding routing situations. Instead, dedicated router hardware is used. For less-demanding applications, such as providing the gateway to a single subnet, Linux is an excellent choice. Installing gated The gated software is part of some Linux distributions, and when it is, gated is often installed during the initial system installation. If the gated package was not installed during the initial installation, install it now. In this section, we use Red Hat Linux 7.1 as our sample system because the examples in this book are Red Hat based, and 7.1 was the last release of Red Hat that shipped gated as its default routing software. On a Red Hat 7.1 system, use RPM to install the software from the CD-ROM. Figure 7.4 shows the result of a gnorpm query after gated is installed. Figure 7.4: Installing gated with gnorpm After gated is installed, use a tool such as tksysv or chkconfig to enable it. The following example shows gated being enabled for run levels 3 and 5: 219

Note: If you are looking for good and affordable webspace to host and run your servlet application check Virtualwebstudio servlet hosting services