barcode generator in vb.net free download The Kernel Routing Table in Software

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The Kernel Routing Table
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The routing table maintains an index of routes to networks and routers that are available to the local host. Routes can be determined dynamically, by using RDISC for example, or can be added manually, by using route or ifconfig. These commands are normally used at boot time to initialize network services. There are three kinds of routes: Host routes network. Map a path from the local host to another host on the local
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Network routes Allow packets to be transferred from the local hosts to other hosts on the local network.
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Routing and Firewalls
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Basic firewall configuration blocking incoming and outgoing ports
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Default routes Pass the task of finding a route to a router. Both RIP and RDISC daemons can use default routes. Dynamic routing often causes changes in the routing table after booting, when a minimal routing table is configured by ifconfig when initializing each network interface, as the daemons manage changes in the network configuration and router availability.
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The basic procedures for router configuration are provided in this section.
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Configuring a Router
In order to configure routing, it is necessary to enable the appropriate network interfaces. In this chapter, we will assume that an Ethernet network is being used, thus, each system that acts as a router must have at least two Ethernet interfaces installed. In addition, Solaris also supports multiple Ethernet interfaces to be installed on a single machine. These are usually designated by files like /etc/hostname.hmen for dual-homed systems, /etc/hostname.qen for quad-homed hosts, or /etc/hostname.len for older machines, where n is the interface number. Interface files contain an FQDN, with the primary network interface being designated with an interface number of 0. Thus, the primary interface of a machine called server would be defined by the file /etc/hostname.hme0, which might contain the FQDN external.server.com. A secondary network interface, connected to a different subnet, might be defined in the file /etc/hostname.hme1. In this case, the file might contain the address internal.server.com. A system with a second network interface can act either as a router or as a multihomed host. Hostnames and IP addresses are locally administered through a naming service, which is usually the Domain Name Service (DNS) for companies connected to the Internet, and the Network Information Service (NIS/NIS+) for companies with large internal
Part V:
Networking
networks that require administrative functions beyond what DNS provides, including centralized authentication. It is also worth mentioning at this point that it is quite possible to assign different IP addresses to the same network interface, which can be useful for hosting virtual domains that require their own IP address, rather than relying on application-level support for multihoming (e.g., when using the Apache Web server). Simply create a new /etc/hostname.hmeX:Y file for each IP address required, where X represents the physical device interface, and Y represents the virtual interface number. In the examples presented in the introduction to this chapter, each of the routers had two interfaces, one for the internal network and one for the external Internet. The subnet mask used by each of these interfaces must also be defined in /etc/netmasks. This is particularly important if the interfaces lie on different subnets or serve different network classes. In addition, it might also be appropriate to assign an FQDN to each of the interfaces, although this will depend on the purpose to which each interface is assigned. For the system router.subsidiary.com, there will be two hostname files created in the /etc directory. When installing a system as a router, it is necessary to determine which network interface to use as the external interface for passing information between networks. This interface must be defined in the file /etc/defaultrouter, by including that interface s IP address. These addresses can be matched to hostnames if appropriate. For example, the interfaces for router.subsidiary.com will be defined in /etc/hosts as
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