How to configure two interfaces in a single Linux Server. As I want to configure eth0 with a static public IP and eth1 with a dhcp service for others.

go to /etc/sysconfig/network-scripts

vi ifcfg-eth0

and edit the below 

DEVICE=eth0

BOOTPROTO=static

HWADDR=xxxxxxxxx (THis is the NIC MAC address)

IPADDR= Your IP

NETMASK= netmask

ONBOOT=yes

save and exit this file. 

then open ifcfg-eth1 file :

vi ifcdfg-eth1

DEVICE=eth1

BOOTPROTO=dhcp

HWADDR=xxxxxxxxx (THis is the other NIC MAC address)

ONBOOT=yes

restart network services and now it should work fine even at PC restart. 

Thanks,

Configure in ifcfg-eth0 and ifcfg-eth1 file from /etc/sysconfig/network-scripts

For dhcp - put bootproto as dhcp

static - put bootproto as none/static

Specify IPADDR=x.x.x.x

GATEWAY=x.x.x.x

DNS1=x.x.x.x

Hi, 

Make sure before you making any changes to configuration file you have the backup of it and have root login credentails...if you move to this directory point /etc/sysconfig/network-scripts/ there you will find two files 

1- ifcfg-eth0

2- ifcfg-eth1

cd /etc/sysconfig/network-scripts/

vi ifcfg-eth0

DEVICE=eth0

BOOTPROTO=static

HWADDR=xxxxxxxxx

IPADDR= Your Public IP

NETMASK= specify netmask

ONBOOT=yes

save and exit this file. 

then open ifcfg-eth1 file :

vi ifcdfg-eth1

DEVICE=eth1

BOOTPROTO=dhcp

HWADDR=xxxxxxxxx

ONBOOT=yes

make sure you restart network services. 

services network restart

check that IP information has been updated. use 

ifconfig or ethtool eth0 are very usefull commands. 

you have to configure eth0 by editing the following:  /etc/sysconfig/network-scripts/ifcfg-eth0

and put the static iP address as: 

DEVICE=eth0

HWADDR=

TYPE=Ethernet

ONBOOT=yes

IPV6INIT=

IPADDR=

NETMASK=

BROADCAST=

NETWORK=

GATEWAY=

DNS1=

DNS2=

and the same as assine a local IP address for eth1 to get ip from DHCP 

add this:

BOOTPROTO=dhcp

I've done this once before on an openBSD.. 

I had to simply configure the eth0 with a static ip address, using ifconfig.. then start the dhcpd on eth1.. and edit the routing table to tell the new network where is its gateway.. you'll probably need to look into nameservers if you are using extra services. 

gl