78 lines
1.8 KiB
Markdown
78 lines
1.8 KiB
Markdown
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---
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tags: [networks, internet, Debian, linux, Ethernet]
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---
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## Ethernet
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First identify the name of your Ethernet interface with
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[`ip addr show`](./View_IP_addresses.md). Example output:
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```
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enp1s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
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link/ether 40:b0:34:37:40:40 brd ff:ff:ff:ff:ff:ff
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inet 192.168.178.53/24 brd 192.168.178.255 scope global enp1s0
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```
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That last line is configured via `/etc/network/interfaces`. If you have not set
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this up, the top line will say `DOWN` instead of `UP` and you will not have
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internet access over Ethernet.
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The follwing example of `/etc/network/interfaces` is a common default:
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```
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auto enp1s0
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iface enp1s0 inet static
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address 192.168.178.49
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netmask 255.255.255.0
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gateway 192.168.178.1
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dns-nameservers 8.8.8.8 8.8.4.4
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```
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Sets the following:
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- connect automatically as soon as Ethernet port activated
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- use the `enp1s0` interface and insist on static IP from [DHCP](./DHCP.md)
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- use the static IP address `192.168.178.49`
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- use standard subnet masking
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- use Google as the preferred and fallback DNS
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Restart networking:
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```sh
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sudo systemctl restart networking
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```
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Confirm connection again with `ip addr show` or
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`sudo systemctl status networking`.
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## Turn the Ethernet interface on/off
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```sh
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ifup enp1s0
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ifdown enp1s0
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```
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### Use dynamic local IP address
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If you don't want to use a static IP, the contents of `/etc/network/interfaces`
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is more minimal:
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```
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auto enp1s0
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iface enp1s0 inet dhcp
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```
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Basically you just let DHCP do the work of negotiating the IP address from the
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router.
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## Contrast with other Linux operating systems
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Arch uses `systemd-resolvd` and NetworkManager. You won't find
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`etc/network/interfaces`.
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To check network status on Arch use:
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```sh
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systemctl status NetworkManager
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```
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