Fedora Linux Network Services pdf

1
Fedora Linux Network Services
2
In this part
•
Network Interface (naming, type )
•
Network Configuration Files
•
Interface control command and scripts
•
Basic routing using route command
3
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.
4
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

5
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
6
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.
7
•
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”
8
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
9
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
10
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.
11
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
to turn off any services you don’t want.
12
Other important network configuration files
in the /etc/sysconfig directory
•
Network configuration files in

/etc/sysconfig/network-scripts
•
IFCFG-NETWORKINTERFACENAME
•
IFUP AND IFDOWN
13
Interface control command and
scripts
14
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
/etc/sysconfig/network-scripts called
ifcfg-eth0.
15
Gateways and Routers
•
route add -net 192.168.1.0
•
route add default gw 192.168.1.1