Road to RHCE - Day 8

Day 8

Network Configuration

IP classes

Class          Range           Default subnet mask        Prefix

Class A  -> 1 to 126     -> 255.0.0.0                      -> 8
Class B  -> 128 to 191 -> 255.255.0.0                  -> 16
Class C  -> 192 to 223 -> 255.255.255.0              -> 24
Class D  -> 224 to 235
Class E  -> 236 to 254

255 -> broadcast address

127 -> loopback address


Subnetting -> dividing a large network into small networks
Subnet Mask -> unique id for such small networks


To configure network using TUI client

system-config-network

[! there are 2 options available - device & dns configuration]

Device configuration


Name                             : eth0
Device                            : eth0
Use DHCP                      : None
Static IP                         : 192.168.0.109
Netmask                        : 255.255.255.0
Default gateway IP         : 192.168.0.254
Primary DNS server        : 192.168.0.254
Secondary DNS server    : 192.168.0.254

[! this is a sample setup that uses static IP]

To update the changes

service network restart


To check the IP of the system

ifconfig
ip addr show


Associated config files

1. /etc/sysconfig/network-scripts/ifcfg-eth0

[! to configure the ip]

2. /etc/sysconfig/network

[! contains the hostname of the system]

3. /etc/resolv.conf

[! contains the DNS info]

To get the current hostname of the system

hostname


To know the status of all configured devices

service network status

-- End of Day 8 --

-- End of SA1 --