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The next example adds the IP address for the loopback interface to the routing table:
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route add 127.0.0.1
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With the add argument, you can add routes either for networks with the net option or with the host option for IP interfaces (hosts). The host option is the default. In addition, you can
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then specify several parameters for information, such as the netmask (netmask), the gateway (gw), the interface device (dev), and the default route (default). If you have more than one IP interface on your system, such as several Ethernet cards, you must specify the name of the interface using the dev parameter. If your network has a gateway host, you use the gw parameter to specify it. If your system is connected to a network, at least one entry should be in your routing table that specifies the default route. This is the route taken by a message packet when no other route entry leads to its destination. The following example is the routing of an Ethernet interface:
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# route add 192.168.1.2 dev eth0
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If your system has only the single Ethernet device as your IP interface, you could leave out the dev eth0 parameter:
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# route add 192.168.1.2
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You can delete any route you establish by invoking ifconfig with the del argument and the IP address of that route, as in this example:
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# route del 192.168.1.2
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You also need to add routes for networks that an IP interface can access. For this, you use the net option. In this example, a route is set up for a system's LAN at 192.168.1.0:
# route add -net 192.168.1.0 dev eth0
For a gateway, you first add a route to the gateway interface, and then add a route specifying that it is a gateway. The address of the gateway interface in this example is 192.168.1.1:
# route add 192.168.1.1 # route add default gw 192.168.1.1
If you are using the gateway to access a subnet, add the network address for that network (in this example, 192.168.23.0):
# route add net 192.168.23.0 gw dev eth1
To add another IP address to a different network interface on your system, use the ifconfig and route commands with the new IP address. The following command configures a second Ethernet card (eth1) with the IP address 192.168.1.3:
ifconfig eth1 192.168.1.3 route add 192.168.1.3 dev eth1
Monitoring Your Network: ping and netstat
With the ping program, you can check to see if you can actually access another host on your network. The ping program sends a request to the host for a reply. The host then sends a reply back, and it is displayed on your screen. The ping program continually sends such a request until you stop it with a break command, a CTRL-C. You see one reply after another scroll by on your screen until you stop the program. If ping cannot access a host, it issues a message saying the host is unreachable. If ping fails, this may be an indication that your network
connection is not working. It may only be the particular interface, a basic configuration problem, or a bad physical connection. ping uses the Internet Control Message Protocol (ICMP) discussed in 40. Networks may block these protocols as a security measure, also preventing ping from working. A ping failure may simply indicate a security precaution on the part of the queried network. To use ping, enter ping and the name of the host. You can also use the KDE network utilities on the KDE desktop and gfinger on the Gnome desktop (see 21).
$ ping ftp.redhat.com
The netstat program provides real-time information on the status of your network connections, as well as network statistics and the routing table. The netstat program has several options you can use to bring up different sorts of information about your network (see Table 38-9):
# netstat Active Internet connections Proto Recv-Q Send-Q Local Address Foreign Address (State) User tcp 0 0 turtle.mytrek.com:01 pango1.mytrain.com.:ftp ESTABLISHED dylan Active UNIX domain sockets Proto RefCnt Flags Type State Path unix 1 [ ACC ] SOCK_STREAM LISTENING /dev/printer unix 2 [ ] SOCK_STREAM CONNECTED /dev/log unix 1 [ ACC ] SOCK_STREAM LISTENING /dev/nwapi unix 2 [ ] SOCK_STREAM CONNECTED /dev/log unix 2 [ ] SOCK_STREAM CONNECTED unix 1 [ ACC ] SOCK_STREAM LISTENING /dev/log
The netstat command with no options lists the network connections on your system. First, active TCP connections are listed, and then the active domain sockets are listed. The domain sockets contain processes used to set up communications among your system and other systems. The various fields are described in the following table. You can use netstat with the -r option to display the routing table, and netstat with the -i option displays the uses of the different network interfaces. Table 39-9: The netstat Options Description Displays information about all Internet sockets, including those sockets that are only listening Displays statistics for all network devices Displays network status continually every second until the program is interrupted Displays remote and local addresses as IP addresses Displays timer states, expiration times, and backoff state for network connections Displays the kernel routing table Displays information about TCP sockets only, including those that are listening Displays information about UDP sockets only
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