====== Linux Network Commands ======


Display Current Config for all NIC's: ifconfig

Display Current Config for eth0: ifconfig eth0

Assign IP: ifconfig eth0 192.168.1.2

===== Change to dhcp: =====

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

  DEVICE=eth0
  BOOTPROTO=dhcp
  HWADDR=00:19:D1:2A:BA:A8
  ONBOOT=yes

===== set to static =====
  DEVICE="eth0"
  BOOTPROTO="static"
  HWADDR="00:0C:29:D7:CD:F2"
  IPADDR=192.168.2.9
  NETMASK=255.255.255.0
  GATEWAY=192.168.2.1
  ONBOOT="yes"

Save and close the file. Just restart network service:
  /etc/init.d/network restart

Show IP address
  ip addr show eth0

Ping: ping -c 3 192.168.1.1

Assign multiple IP's: ifconfig eth0:0 192.168.1.2

Assign second IP: ifconfig eth0:1 192.168.1.3

Disable network card: ifconfig eth0 down

Enable network card: ifconfig eth0 up

View current routing table: route "or" route -n

View arp cache: arp "or" arp -n

Assign IP/Subnet: ifconfig eth0 192.168.1.2 netmask 255.255.255.0

Assign Default Gateway: route add default gw 192.168.1.1

Add dns into /etc/resolv.conf
nameserver 8.8.8.8

Trace Route: traceroute www.whatismyip.com

Trace Path: tracepath www.whatismyip.com

DNS Test: host www.whatismyip.com

Advanced DNS Test: dig www.whatismyip.com

Reverse Lookup: host 66.11.119.69

Advanced Reverse Lookup: dig -x 66.11.119.69

Read more: http://www.whatismyip.com/faq/linux-ip-commands.asp#ixzz29upjcTuF

===== how to reduce RAM consumption (disable printing, smartcards, etc.) =====

  chkconfig --list | grep "\bon\b"

should show you the list of things that are currently set to start on boot. You can review those and

  chkconfig $servicename off


=====Check Linux Install=====
  cat /etc/*-release