Ubuntu networking
IP addressing
Temporary set IP address
sudo ifconfig eth0 192.168.100.2/24 up sudo ifconfig eth0 192.168.100.2 netmask 255.255.255.0
Temporary add default GW
sudo route add default gw 192.168.100.1 eth0
To verify your default gateway configuration, you can use the route command in the following manner.
route -n Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 0.0.0.0 192.168.100.1 0.0.0.0 UG 0 0 0 eth0 192.168.100.0 0.0.0.0 255.255.255.0 U 1 0 0 eth0
DNS for your temporary network configuration, you can add DNS server IP addresses in the file /etc/resolv.conf. Please bear in mind these changes will be overwritten.
nameserver 8.8.8.8 nameserver 8.8.4.4
If you no longer need this configuration and wish to purge all IP configuration from an interface, you can use the ip command with the flush option as shown below:
ip addr flush eth0
Networking Tools
nm-tool - utility to report NetworkManager state and devices, it provides information about NM, device and wireless networks.
Ethernet Interfaces wip... add D620 output ...
- Identify Ethernet Interfaces
lshw shows here an interface with the logical name of eth0 along with bus information, driver details and all supported capabilities
sudo lshw -class network
*-network
description: Ethernet interface
product: BCM4401-B0 100Base-TX
vendor: Broadcom Corporation
physical id: 0
bus info: pci@0000:03:00.0
logical name: eth0
version: 02
serial: 00:15:c5:4a:16:5a
size: 10MB/s
capacity: 100MB/s
width: 32 bits
clock: 33MHz
capabilities: (snipped for brevity)
configuration: (snipped for brevity)
resources: irq:17 memory:ef9fe000-ef9fffff
- Ethernet Interface Logical Names
Interface logical names are configured in the file /etc/udev/rules.d/70-persistent-net.rules. If you would like control which interface receives a particular logical name, find the line matching the interfaces physical MAC address and modify the value of NAME=ethX to the desired logical name. Reboot the system to commit your changes.
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="00:15:c5:4a:16:5a", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="eth*", NAME="eth0"
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="00:15:c5:4a:16:5b", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="eth*", NAME="eth1"
- Ethernet Interface Settings
ethtool is a program that displays and changes Ethernet card settings such as auto-negotiation, port speed, duplex mode, and Wake-on-LAN. It is not installed by default, but is available for installation in the repositories.
sudo apt-get install ethtool
The following is an example of how to view supported features and configured settings of an Ethernet interface.
sudo ethtool eth0
Settings for eth0:
Supported ports: [ TP ]
Supported link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Half 1000baseT/Full
Supports auto-negotiation: Yes
Advertised link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Half 1000baseT/Full
Advertised auto-negotiation: Yes
Speed: 1000Mb/s
Duplex: Full
Port: Twisted Pair
PHYAD: 1
Transceiver: internal
Auto-negotiation: on
Supports Wake-on: g
Wake-on: d
Current message level: 0x000000ff (255)
Link detected: yes
Changes made with the ethtool command are temporary and will be lost after a reboot. If you would like to retain settings, simply add the desired ethtool command to a pre-up statement in the interface configuration file /etc/network/interfaces.
The following is an example of how the interface identified as eth0 could be permanently configured with a port speed of 1000Mb/s running in full duplex mode.
auto eth0 iface eth0 inet static pre-up /usr/sbin/ethtool -s eth0 speed 1000 duplex full