Networking

Configuring hostname

/etc/sysconfig/network

NETWORKING=yes
HOSTNAME=lin1
GATEWAY=10.10.10.1

Hostname also stored in /etc/hosts

Configuring IP address for static IP address

/etc/hosts

# Do not remove the following line, or various programs
# that require network functionality will fail.
127.0.0.1               localhost.localdomain localhost
10.10.10.100            lin1.dns.net lin1

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

DEVICE=eth0
BOOTPROTO=static
IPADDR=10.10.10.100
ONBOOT=yes

Configuring IP address for DHCP

/etc/hosts

# Do not remove the following line, or various programs
# that require network functionality will fail.
127.0.0.1               lin1.dns.net lin1 localhost.localdomain localhost

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

DEVICE=eth0
BOOTPROTO=dhcp
ONBOOT=yes

Setting Speed/Duplex on NIC

This can be done a number of ways including

Use /sbin/mii-tool (part of net-tools package). An example of usage : 

/sbin/mii-tool -F 100baseTx-FD eth0 


or use ethtool
/usr/sbin/ethtool -s eth0 speed 100 duplex full 

With some ethernet cards sometimes you get the following error with ethtool:

Cannot get current device settings: Operation not supported 
not setting speed 
not setting duplex 

in which case use mii-tool as mentioned above