#### Beyond Linux® From Scratch (System V Edition) - Version 12.3

### Chapter 15. Networking Programs

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# Net-tools-2.10

## Introduction to Net-tools

The Net-tools package is a collection of programs for controlling the network subsystem of the Linux kernel.

This package is known to build and work properly using an LFS 12.3 platform.

### Package Information

- Download (HTTP): https://downloads.sourceforge.net/project/net-tools/net-tools-2.10.tar.xz

- Download MD5 sum: 78aae762c95e2d731faf88d482e4cde5

- Download size: 228 KB

- Estimated disk space required: 7.5 MB

- Estimated build time: less than 0.1 SBU

## Installation of Net-tools

The instructions below automate the configuration process by piping yes to the make command. If you wish to run the interactive configuration process (by changing the instruction to just make), but you are not sure how to answer all the questions, then just accept the defaults. This will be just fine in the majority of cases. What you're asked here is a bunch of questions about which network protocols you've enabled in your kernel. The default answers will enable the tools from this package to work with the most common protocols: TCP, PPP, and several others. You still need to actually enable these protocols in the kernel—what you do here is merely tell the package to include support for those protocols in its programs, but it's up to the kernel to make the protocols available.

### Note

This package has several unneeded protocols and hardware device specific functions that are obsolete. To only build the minimum needed for your system, skip the yes command and answer each question interactively. The minimum needed options are 'UNIX protocol family' and 'INET (TCP/IP) protocol family'.

For this package, we use the DESTDIR method of installation in order to easily remove files from the build that overwrite those that we want to keep or are not appropriate for our system.

Install Net-tools by running the following commands:

    export BINDIR='/usr/bin' SBINDIR='/usr/bin' &&
    yes "" | make -j1                           &&
    make DESTDIR=$PWD/install -j1 install       &&
    rm    install/usr/bin/{nis,yp}domainname    &&
    rm    install/usr/bin/{hostname,dnsdomainname,domainname,ifconfig} &&
    rm -r install/usr/share/man/man1            &&
    rm    install/usr/share/man/man8/ifconfig.8 &&
    unset BINDIR SBINDIR

This package does not come with a test suite.

Now, as the `root` user:

    chown -R root:root install &&
    cp -a install/* /

## Command Explanations

export BINDIR='/usr/bin' SBINDIR='/usr/bin': Ensure the executables are installed in the correct location.

yes "" | make : Piping yes to make config skips the interactive configuration and accepts the defaults.

rm ...: Remove unneeded programs and man pages.

## Contents

Installed Programs: arp, ipmaddr, iptunnel, mii-tool, nameif, netstat, plipconfig, rarp, route, and slattach
Installed Libraries: None
Installed Directories: None

### Short Descriptions

arp | is used to manipulate the kernel's ARP cache, usually to add or delete an entry, or to dump the entire cache
ipmaddr | adds, deletes and shows an interface's multicast addresses
iptunnel | adds, changes, deletes and shows an interface's tunnels
mii-tool | checks or sets the status of a network interface's Media Independent Interface (MII) unit
nameif | names network interfaces based on MAC addresses
netstat | is used to report network connections, routing tables, and interface statistics
plipconfig | is used to fine tune the PLIP device parameters, to improve its performance
rarp | is used to manipulate the kernel's RARP table
route | is used to manipulate the IP routing table
slattach | attaches a network interface to a serial line. This allows you to use normal terminal lines for point-to-point links to others computers

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