How to configure network card in Red Hat Enterprise Linux, CentOS, Fedora Core from CLI
Red hat Linux provides following tools to make changes to Network configuration such as add new card, assign IP address, change DNS server etc.

[a] GUI tool (X Windows required) – system-config-network
[b] Command line text based GUI tool (No X Windows required) – system-config-network
[c] Edit configuration files stored in /etc/sysconfig/network-scripts/ directory.

Following instructions are compatible with
(1) CentOS Linux
(2) Fedora Core Linux
(3) Red Hat Enterprise Linux (RHEL) 3/4/5

Configuration files stored in /etc/sysconfig/network-scripts/

You can configure network card by editing text files stored in /etc/sysconfig/network-scripts/ directory. First change directory to /etc/sysconfig/network-scripts/:

# cd /etc/sysconfig/network-scripts/

You need to edit / create files as follows:

* /etc/sysconfig/network-scripts/ifcfg-eth0 : First Ethernet card configuration file
* /etc/sysconfig/network-scripts/ifcfg-eth1 : Second Ethernet card configuration file

To edit/create first NIC file, type command:

# vi ifcfg-eth0

Append/modify as follows:

# Intel Corporation 82573E Gigabit Ethernet Controller (Copper)
DEVICE=eth0
BOOTPROTO=static
DHCPCLASS=
HWADDR=00:30:48:56:A6:2E
IPADDR=10.10.29.66
NETMASK=255.255.255.192
ONBOOT=yes

Save and close the file. Define default gateway (router IP) and hostname in /etc/sysconfig//network file:

# vi /etc/sysconfig/network

Append/modify configuration as follows:

NETWORKING=yes
HOSTNAME=www1.php2s.com
GATEWAY=10.10.29.65

Save and close the file. Restart networking:

# /etc/init.d/network restart

Make sure you have correct DNS server defined in /etc/resolv.conf file:

# vi /etc/resolv.conf

Setup DNS Server as follows:

nameserver 8.8.8.8
nameserver 8.8.4.4
nameserver 202.67.222.222

Save and close the file. Now you can ping the gateway/other hosts:

$ping 8.8.8.8

Output

PING 10.0.80.12 (10.0.80.12) 56(84) bytes of data.
64 bytes from 10.0.80.12: icmp_seq=1 ttl=251 time=0.972 ms
64 bytes from 10.0.80.12: icmp_seq=2 ttl=251 time=1.11 ms

You can also check for Internet connectivity with nslookup or host command:

$ nslookup php2s.com

Output

Server: 10.0.80.11
Address: 10.0.80.11#53

Non-authoritative answer:
Name: php2s.com
Address: 72.55.186.62

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