Networking

Last update on November 13 2023 10:30:04 (UTC/GMT +8 hours)

Most networking is configured by editing two files:

Other networking files:

Typical default configuration of /etc/network/interfaces

Directive	Description
auto	Indicates the device should be setup at boot time.
lo	Loopback interface.
iface	"Interface".
eth0	Ethernet device 0, typically the primary network adaptor.
inet	Indicates network adaptor has an IPv4 address space.
dhcp	Network adapter gets its configuration from a DHCP server.

fix your server's IP address in /etc/network/interfaces

Directive	Description
static	Indicates the adaptor uses fixed IP configuration.
address	The IP address of the host. netmask Network subnet mask.
gateway	Gateway address.
network	The network portion of the IP address.
nameserver	The IP of a DNS.

For static interfaces, you may also need to edit /etc/resolv.conf to specify DNS servers.

/etc/hosts

Ubuntu refers to this file to resolve host names before contacting a DNS. Good for frequently used hostnames, or internal network hosts.

Network useful commands

Command	Description
Ping	Test that an internet host is reachable.
ifconfigtd>	Administer a TCP/IP network interface.
sudo /etc/init.d/ networking	stop, start, restart as arguments; controls network status.
route	Examine and configure the host's routing table.

Previous: File system
Next: Backup