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| =Basic Networking= | | =Basic Networking= |
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| This page covers some basic troubleshooting for Linux networks. | | This page covers some basic troubleshooting for Linux networks. See [[Template:LinuxNetworkingFlag]] for more pages like this one. |
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| ==ping==
| | Linux network interfaces: [[Linux/Network Interfaces]] |
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| You managed to run ping. You have even figured out how to use the <code>-c</code> flag to ping a specific number of times. But if it doesn't work, then what?
| | Linux network services: [[Linux/Networking Services]] |
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| Start by checking your networking configuration.
| | =Open Ports= |
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| <pre>
| | List open ports: |
| /etc/network/interfaces
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| </pre>
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| do it
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| <pre> | | <pre> |
| # vim /etc/network/interfaces
| | netstat -lntu |
| </pre> | | </pre> |
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| ==network device configuration== | | =Related= |
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| networking device configurations, if they exist, are located in
| | See [[Template:LinuxNetworkingFlag]] for more pages like this one. |
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| <code>/etc/network/interfaces</code>
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| the file is not required for network hardware to work - it is optional. if nothing is set in the above file, network is probably being managed by network manager. system level daemon that makes things "just work".
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| desktops/laptops usually want network manager, servers/embedded computers/etc want stuff configured in <code>/etc/network/interfaces</code>
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| barebones interfaces file:
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| <pre>
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| $ cat /etc/network/interfaces
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| # The loopback network interface
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| auto lo
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| iface lo inet loopback
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| </pre>
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| check for network manager
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| <pre>
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| $ ps ax | grep NetworkManager
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| </pre>
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| ==option 1: no network manager==
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| kill it! kill it!!!
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| <pre>
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| 446 ? Ssl 0:00 /usr/sbin/NetworkManager --no-daemon
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| </pre>
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| die die die - ok back to what we were doing.
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| ===automatic dhcp===
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| if you want to add your ethernet hardware, and let it automatically request and receive an IP address from a DHCP server (this expects/requires the device to be plugged in to something running a DHCP server, like a router)
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| <pre>
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| # The loopback network interface
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| auto lo
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| iface lo inet loopback
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| # Wired connection eth0
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| auto eth0
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| iface eth0 inet dhcp
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| </pre>
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| ===manual static===
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| <pre>
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| # The loopback network interface
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| auto lo
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| iface lo inet loopback
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| # Wired connection eth0
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| auto eth0
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| iface eth0 inet static
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| address 10.10.10.12
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| netmask 255.255.248.0
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| network 10.10.10.0
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| broadcast 10.10.10.255
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| gateway 10.10.10.1
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| </pre>
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| the following line changed:
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| <pre>
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| iface eth0 inet static
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| </pre>
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| static, not dhcp
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| if you declare dhcp, all other configuration details ignored
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| next declare ip address, 10.10.10.12
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| declare subnet mask to 255.255.248.0
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| declare the network we're joining to 10.10.10.0
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| declare the broadcast ID as 10.10.10.255
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| decalre the gateway as 10.10.10.1
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| now restart networking service
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| <pre>
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| $ systemctl restart networking.service
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| </pre>
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| figure out what networking interfaces are available
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| <pre>
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| $ ifconfig
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| or
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| $ ip addr show
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| </pre>
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| ==option 2: with network manager==
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| can check if network manager is running:
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| <pre>
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| $ ps aux | grep Network
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| </pre>
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| to configure network manager in a gui-like terminal environment:
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| <pre>
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| $ nmtui
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| </pre>
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| This allows you to connect to a wireless network and enter information into corresponding fields, or to set the details of a static IP address for your network for a particular device. When editing an ethernet connection (like the eth0 device) you will see an IPv4 configuration option. If you pick "Show," you can enter an IP address, a gateway, a DNS server, etc.
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| =Related=
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| {{LinuxNetworkFlag}} | | {{LinuxNetworkFlag}} |
