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Network Configuration - Linux OS

Configuring Network for a Linux System

Edit 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/

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

For edit/create first NIC file, type command:

# vi ifcfg-eth0

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.nixcraft.in
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 10.0.80.11
nameserver 10.0.80.12
nameserver 202.67.222.222

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

$ ping 10.0.80.12

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 citi.biz
Output:
Server: 10.0.80.11
Address: 10.0.80.11#53

Non-authoritative answer:
Name: citi.biz
Address: 75.126.43.232

Also you can use host command:

$ host nixcraft.in
Output:
nixcraft.in has address 75.126.43.232
nixcraft.in mail is handled by 10 mail.nixcraft.in.

Regards
Avinash Pillai
URL : http://avinashpillai.blogspot.com
Email: avinashp[AT]aztecsoft[DOT]com, avinashp25[AT]gmail[DOT]com
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