MTD 248-645A Manual de usuario descargar pdf (Pagina 218)

Linux From Scratch - Version 7.0

198

The following command creates a sample file for the eth0 device with a static IP address:

cd /etc/sysconfig/

cat > ifconfig.eth0 << "EOF"

ONBOOT=yes

IFACE=eth0

SERVICE=ipv4-static

IP=192.168.1.1

GATEWAY=192.168.1.2

PREFIX=24

BROADCAST=192.168.1.255

EOF

The values of these variables must be changed in every file to match the proper setup.

If the ONBOOT variable is set to “yes” the network script will bring up the Network Interface Card (NIC) during

booting of the system. If set to anything but “yes” the NIC will be ignored by the network script and not be

automatically brought up. The interface can be manually started or stopped with the ifup and ifdown commands.

The IFACE variable defines the interface name, for example, eth0. It is required for all network device configuration

files.

The SERVICE variable defines the method used for obtaining the IP address. The LFS-Bootscripts package has a

modular IP assignment format, and creating additional files in the /lib/services/ directory allows other IP

assignment methods. This is commonly used for Dynamic Host Configuration Protocol (DHCP), which is addressed

in the BLFS book.

The GATEWAY variable should contain the default gateway IP address, if one is present. If not, then comment out

the variable entirely.

The PREFIX variable needs to contain the number of bits used in the subnet. Each octet in an IP address is 8 bits. If

the subnet's netmask is 255.255.255.0, then it is using the first three octets (24 bits) to specify the network number. If

the netmask is 255.255.255.240, it would be using the first 28 bits. Prefixes longer than 24 bits are commonly used by

DSL and cable-based Internet Service Providers (ISPs). In this example (PREFIX=24), the netmask is 255.255.255.0.

Adjust the PREFIX variable according to your specific subnet.

7.2.3. Creating the /etc/resolv.conf File

If the system is going to be connected to the Internet, it will need some means of Domain Name Service (DNS) name

resolution to resolve Internet domain names to IP addresses, and vice versa. This is best achieved by placing the IP

address of the DNS server, available from the ISP or network administrator, into /etc/resolv.conf. Create the

file by running the following:

cat > /etc/resolv.conf << "EOF"

# Begin /etc/resolv.conf

domain <Your Domain Name>

nameserver <IP address of your primary nameserver>

nameserver <IP address of your secondary nameserver>

# End /etc/resolv.conf

EOF

1 2 ... 213 214 215 216 217 218 219 220 221 222 223 ... 346 347

Sin comentarios

MTD 248-645A Manual de usuario Pagina 218