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As you can see, the contents of this file are rather simple. First, you specify the IP address of the host, which can be an IPv4 or an IPv6 address. Next, the fully qualified host name of the host is specified. This is the name of the host itself, followed by its DNS suffix. Last, the short host name is used. Alternatively, you can just provide the IP address followed by the name of the host you want to add, as in the following line: 192.168.1.180 RNA
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On a modern Linux server, it s not necessary to set up /etc/hosts except for local name resolving. Network name resolution is typically managed by DNS. So you ll always need your own host name and IP address in this file. This is configured automatically when installing Ubuntu Server.
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Configuring Network Card Properties with the ethtool Command
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Up to now, we ve talked about stuff related to IP addresses. But the network card itself has settings that you may need to modify, and you ll use the ethtool command to do this. With it, you can change network board properties such as link speed and duplex mode. Don t overestimate this tool, however. Some Ethernet cards are not supported, and the only way to change settings on them might be through the network card s BIOS settings. Let s start by displaying some information: use ethtool -i eth0 to see an overview of driver properties that are currently used, as shown in Listing 8-11. Listing 8-11. The ethtool -i Command Provides an Overview of Driver Properties root@ZNA:~# ethtool -i eth0 driver: pcnet32 version: 1.33 firmware-version: bus-info: 0000:00:11.0 To change duplex settings and link speed on your network board, you ll use the -s option, followed by one of these arguments: speed: This option changes the speed. Valid options are 10, 100, and 1000 (all of them expressing megabits per second). duplex: This option changes the duplex settings. Set it to half or full. port: This option specifies what port to use. This option is used for network interfaces with different ports available (which is not very common). Valid choices are tp, aui, bnc, mii, and fibre. autoneg: This option indicates whether you want to use auto negotiation to discover the settings that are used on the network. Valid choices are on and off. So, for example, if you want to change the settings of your network card to full duplex and a link speed of 1000 Mbps, use ethtool -s eth0 speed 1000 duplex full. Now there is a problem when using ethtool like this because you need to enter these settings again the next
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time you start your server. If you don t want to do that all the time, you can create a simple script that contains all the settings. The following procedure describes how to do this: 1. Use Vi to create a script: vim /etc/init.d/ethtool. 2. Append the following lines (change them to reflect the settings that you need to use): #!/bin/bash ETHTOOL="/usr/sbin/ethtool" DEV="eth0" SPEED="1000 duplex full" case "$1" in start) echo n "Setting eth0 speed "; $ETHTOOL s $DEV speed $SPEED; echo " done.";; stop) ;; esac exit 0 3. Make this script executable using the command chmod +x /etc/init.d/ethtool. 4. Run the update-rc.d command to update your runlevels. This process ensures that this script will be executed in all appropriate runlevels. Run it as follows: update-rc.d ethtool defaults.
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Note The update-rc.d command is available to add startup scripts to the System-V style boot procedure. You can use it on any script, as long as the script fits these minimal requirements: the script should use a case construction; within the case, there should be a start) and a stop) section. If your script complies with these requirements, you can add it to your runlevels.
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Besides the brief summary you get about your network board when you use the i option with ethtool, there are also some other useful options. For instance, you can get some very detailed statistics about your network board when using ethtool S, as you can see in Listing 8-12.
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Note The drivers of some network boards don t support ethtool. Therefore, in some cases this command shows nothing at all. If that happens, your network card doesn t support ethtool, and there s nothing you can do about it.
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