Configuring Basic Networking - Paiet/Tech-Journal-for-Everything GitHub Wiki

  • /etc/services
    • Enables/disables basic network services
  • Temporarily bring up an interface
    1. ifconfig eth0 up 192.168.0.100 netmask 255.255.255.0
    2. route add default gw 192.168.0.1
    3. ifconfig and route -n to verify
  • /etc/sysconfig/network-scripts/ifcfg-eth0
    • Configuration for a NIC on Redhat
    • Ubuntu uses /etc/network/interfaces
    • RedHat uses NetworkManager
      • chkconfig NetworkManager off

To Begin

DEVICE=eth0
TYPE=Ethernet
BOOTPROTO=static
IPADDR=192.168.0.2
NETMASK=255.255.255.0
GATEWAY=192.168.0.1
ONBOOT=yes
NM_CONTROLLED=no
  • /etc/sysconfig/network
    • Configurations that apply to all NICs
    • GATEWAY=192.168.0.1
  • Name Lookups
    • /etc/hosts
      • Overrides DNS
    • /etc/hostname
      • hostname <name> is not normally persistent
      • Defines a machines hostname
      • Not present in all distros
      • In RedHat you must update /etc/sysconfig/network and /etc/hosts
    • /etc/resolv.conf
      • DNS Servers
    • /etc/nsswitch.conf
      • Controls lookup system beyond just DNS
      • NIS+ Servers
        • hosts: files dns
  • Restarting the network service
    • Most changes require restarting the network service
    • service network restart
    • systemctl restart network.service
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