Fedora Linux Network Services pdf

• Network Configuration Files • Interface control command and scripts • Basic routing using route command... Network configuration files important network configuration files in the /etc

Fedora Linux Network Services

In this part

• Network Interface (naming, type )

• Network Configuration Files

• Interface control command and scripts

• Basic routing using route command

Network interface

• The first Ethernet NIC is given the alias eth0, the second Ethernet NIC is given the alias eth1, and so on

• Loopback lo

Network configuration files

important network configuration files in the /etc/sysconfig directory

• Set up the IP addresses of your network interfaces Make changes to:

• /etc/sysconfig/network-scripts/ifcfg-eth0

• /etc/sysconfig/network-scripts/ifcfg-eth1

Network configuration Files

• Make a local file of hostname to IP address mappings Make changes to:

• /etc/hosts

• Set up the device order from which hostnames are looked up Make changes to:

• /etc/nsswitch.conf

SETTING UP THE IP

ADDRESS

• If you haven’t set the IP address already in the installation process, you need to edit the configuration files by hand

• To set the IP address on your first Ethernet interface eth0, edit the

/etc/syscon-fig/network-scripts/ifcfg-eth0 file

• The /etc/sysconfig/network-scripts/ifcfg-eth0 file

• DEVICE=”eth0”

• BOOTPROTO=”none”

• BROADCAST=192.168.1.255

• IPADDR=”192.168.1.10”

• NETMASK=”255.255.255.0”

• NETWORK=192.168.1.0

• ONBOOT=”yes”

• USERCTL=no

• IPXNETNUM_802_2=””

• IPXPRIMARY_802_2=”no”

• IPXACTIVE_802_2=”no”

• IPXNETNUM_802_3=””

• IPXPRIMARY_802_3=”no”

• IPXACTIVE_802_3=”no”

• IPXNETNUM_ETHERII=””

• IPXPRIMARY_ETHERII=”no”

• IPXACTIVE_ETHERII=”no”

SETTING UP A DEFAULT

GATEWAY

• Change the /etc/sysconfig/network file

to contain just the IP address of the gateway, like this:

• 192.168.1.1

SETTING UP THE DNS

SERVERS

• Edit /etc/resolv.conf to contain a list of nameservers, like so:

• nameserver 192.168.1.1

• nameserver 203.14.1.3

SETTING UP THE DEVICE ORDER FROM

WHICH HOSTNAMES ARE LOOKED UP

• The place to set up this configuration is in the

/etc/nsswitch.conf file Edit

• the following line: hosts:files nisplus dns

• The order of the words files, nisplus, and dns determines which method is checked first Files refers to the /etc/hosts file, nisplus refers to any nisplus

• servers you may have on your network, and dns refers to any DNS servers you have set

up your machine to reference.

Starting up network services from xinetd

• /etc/xinetd.conf

• At the end of the xinetd.conf file is a line that indicates that all the files in the

• /etc/xinetd.d

• are also included in the configuration

This means that you need to go through the files in that directory as well in order

Other important network configuration files

in the /etc/sysconfig directory

• Network configuration files in

/etc/sysconfig/network-scripts

• IFCFG-NETWORKINTERFACENAME

• IFUP AND IFDOWN

Interface control command and scripts

Configuring the network

card

• ifconfig eth0 192.168.1.1 netmask 255.255.255.0 broadcast 192.168.1.255

• A file is created in

ifcfg-eth0

Gateways and Routers

• route add -net 192.168.1.0

• route add default gw 192.168.1.1