特殊:Badtitle/NS100:NetworkAdmin
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{{#ifexist: :NetworkAdmin/zh | | {{#ifexist: NetworkAdmin/zh | | {{#ifeq: {{#titleparts:NetworkAdmin|1|-1|}} | zh | | }} }} }} {{#ifeq: {{#titleparts:NetworkAdmin|1|-1|}} | zh | | }}
{{https://help.ubuntu.com/community/IconsPage?action=AttachFile&do=get&target=IconNIC.png%7D%7D In Ubuntu, the graphical configuration tool to configure network interfaces is called network-admin
. This is an alternative to using nm-applet
(GNOME front end for NetworkManager).
/!\ nm-applet
does not use the standard NetworkAdmin file /etc/network/interfaces
to store the Wireless Network settings, so you will not be able to use ifup
and ifdown
commands to start/stop network adapters. This can make it more difficult to diagnose connection problems.
Start
There are two ways to start network-admin
:
- {{https://help.ubuntu.com/community/IconsPage?action=AttachFile&do=get&target=IconGNOMETerminal.png%7D%7D Type
network-admin
into a terminal (Hardy Heron and newer).
- in Gutsy and older, you need to run
gksudo network-admin
- {{https://help.ubuntu.com/community/IconsPage?action=AttachFile&do=get&target=navigate.png%7D%7D From your menu bar, go to System->Administration->Networking
{{https://help.ubuntu.com/community/NetworkAdmin?action=AttachFile&do=get&target=unlock.png%7D%7D In Hardy Heron and newer you will need to click the Unlock button and enter your password to make changes (assuming you have admin/sudo privileges on your user account - see RootSudo). {{https://help.ubuntu.com/community/NetworkAdmin?action=AttachFile&do=get&target=authenticate.png%7D%7D
Configuration
{{https://help.ubuntu.com/community/IconsPage?action=AttachFile&do=get&target=IconHammer2.png%7D%7D
If you are using a dialup modem, see here.
Wired connections generally work out of the box, but if the connection fails, select your "Wired connection" and hit the Properties button. Now check the box for "Enable roaming mode".
{{https://help.ubuntu.com/community/NetworkAdmin?action=AttachFile&do=get&target=roaming.png%7D%7D
Wireless connections can prove a little more tricky, and are usually easily configured using nm-applet
from the tray area. If you would rather use this method, select "Wireless connection" and hit the Properties button. Enter your wireless network's ESSID and WEP/WPA password (if applicable). Under Connection Settings, you will most likely want to select "Automated Configuration (DHCP)" for the "Configuration" option.
- The preferred method is to "Enable roaming mode" - this often fixes problems when trying to connect to networks using
nm-applet
.
Advanced Configuration
{{https://help.ubuntu.com/community/IconsPage?action=AttachFile&do=get&target=IconControlCenter2.png%7D%7D Please consult your router's manual for help with accessing router configuration pages, which may be needed for using advanced networking options. Most of these are available in PDF format online, just Google your router's make/model.
Static IP address
This applies to both wired and wireless network settings. First, be sure that roaming mode is disabled. I have provided you with an example using a Linksys router, but every make and model router can be a little different:
- Configuration: Static IP Address
- IP address: 192.168.1.200 - the last octet of the IP address should usually be between 150 and 255, which is outside the DHCP range of a standard Linksys router.
- Subnet mask: 255.255.255.0
- Gateway address: 192.168.1.1 - this is usually your router's internal IP address.
{{https://help.ubuntu.com/community/NetworkAdmin?action=AttachFile&do=get&target=static.png%7D%7D
General tab
Here you can set your computer's Host name and Domain name. These are needed when sharing files, folders, and printers between computers on a network. All computers should be on the same domain, and your host name is your computer's unique identifier. {{https://help.ubuntu.com/community/NetworkAdmin?action=AttachFile&do=get&target=general.png%7D%7D
DNS tab
Most people will not want to fiddle with this unless they are using their own DNS servers, or their computer is not auto-detecting them. Since this varies between ISPs and networks, we will not cover examples here. {{https://help.ubuntu.com/community/NetworkAdmin?action=AttachFile&do=get&target=dns.png%7D%7D
Hosts tab
This is data stored in the /etc/hosts
file. Here is a generic example, most computers will have very similar values:
127.0.0.1 localhost 127.0.1.1 your_computer_name ::1 ip6-localhost ip6-loopback fe00::0 ip6-localnet ff00::0 ip6-mcastprefix ff02::1 ip6-allnodes ff02::2 ip6-allrouters ff02::3 ip6-allhosts
{{https://help.ubuntu.com/community/NetworkAdmin?action=AttachFile&do=get&target=hosts.png%7D%7D
Storage of Profiles And Settings
network-admin
stores information about different Profiles in the following directory:
~/.gnome2/network-admin-locations
During startup, the system will activate the network interfaces stored in the file /etc/network/interfaces
.
Troubleshooting
{{https://help.ubuntu.com/community/IconsPage?action=AttachFile&do=get&target=IconFAQ.png%7D%7D A very good place to begin is by restarting the networking service:
sudo /etc/init.d/networking restart
Another good method is to stop/restart the network interface(s) from the terminal, one at a time, which shows some diagnostic messages. wlan0
is used as an example, but this applies to all interfaces:
sudo ifdown wlan0 sudo ifup wlan0
You may also diagnose the network adapter status with commands:
ifconfig iwconfig dmesg tail /var/log/messages
Ask for Help
{{https://help.ubuntu.com/community/IconsPage?action=AttachFile&do=get&target=info.png%7D%7D The UbuntuHelp:UbuntuForums provide great community support, so check out the Networking & Wireless area of the forums.
Other Resources
{{https://help.ubuntu.com/community/IconsPage?action=AttachFile&do=get&target=IconBook-small.png%7D%7D
- Ubuntu Networking Configuration Using Graphical Tool
- Ubuntu:ZeroConfNetworking
- UbuntuHelp:WifiDocs/WiFiHowTo
- Ubuntu:NetworkRoaming
- UbuntuHelp:DnsAndDhcp
- Getting Support: Ubuntu Forums: Networking & Wireless