DHCP vs Static IP – Linux Audio Foundation

# OPTIONAL STATIC IP

# identify your ethernet card name usualy eth0 or enp3s0

```
$ ip link show
```

# A DHCP CONFIG IS PERFECTLY VALID for building your Audophile Server,
#
# DHCP Reservation service (included in your netbox/router) provides an IP address to a specific client based on it’s physical MAC address.
# the device will always get the same IP address and it will never change as soon as you do not replace your Ethernet card.

# check /etc/network/interfaces and add the following DHCP entries if missing

```
$ sudo nano /etc/network/interfaces
```

# if your eternet card is eth0

auto eth0
iface eth0 inet dhcp

# or if it’s enp3s0 (amd64 Gigabyte Brix)

auto enp3s0
iface enp3s0 inet dhcp

# or if it’s enp2s0 (amd64 Intel NUC)

auto enp2s0
iface enp2s0 inet dhcp

# CTRL+O to save
# CTRL+X to exit

# or if netplan is used (Ubuntu 22.04 amd64) you can make a generic config
# to match any Ethernet adapter

$ sudo nano /etc/netplan/00-installer-config.yaml

network:
  ethernets:
    eth:
      match:
        name: en*
      dhcp4: true
  version: 2

# CTRL+X then Y to save

# for amd64 check dmesg in case of error type:

```
sudo dmesg
```

... firmware: failed to load i915/glk_dmc_ver1_04.bin (-2)

# install the realtek firmware and reboot
# add the non free repo to sources list

```
sudo nano /etc/apt/sources.list
```

# add these lines

deb http://deb.debian.org/debian bullseye-backports main contrib non-free
deb-src http://deb.debian.org/debian bullseye-backports main contrib non-free

# update pkgs

```
$ sudo apt update
```

# install firmware

```
$ sudo apt install firmware-realtek
```

$ sudo apt install firmware-misc-nonfree

```
$ sudo reboot
```

# open your router dhcp setting and “reserve” the IP address of your audio server
# to skip the STATIC IP tutorial below
# go to the bottom page and click the NEXT POST button

# identify your ethernet card name usualy eth0 or enp3s0

# WIFI IS NOT RECOMMENDED, remove your wifi card from your device

# and configure a static IP address in /etc/dhcpcd.conf:

# Static IP on Raspberry PI 4

```
$ ip link show
```

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1000
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP mode DEFAULT group default qlen 1000
3: wlan0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN mode DEFAULT group default qlen 1000

# eth0 is your default interface (Ethernet connection), do not use wifi for your audio server

# if eth0 is NOT VISIBLE then pass net.ifnames=0 to the kernel cmd by adding this at the beginning of /boot/cmdline.txt and reboot

```
$ sudo nano /boot/cmdline.txt
```

# save
CTRL+X then Y then ENTER

```
$ sudo reboot
```

# to configure statis ip address

```
$ sudo nano /etc/network/interfaces
```

# add the following lines at end (remove dhcp lines):

auto eth0
iface eth0 inet static
address 192.168.x.x
netmask 255.255.255.0
network 192.168.x.x
gateway 192.168.x.x

# example:

auto eth0
iface eth0 inet static
address 192.168.1.75
netmask 255.255.255.0
network 192.168.1.0
gateway 192.168.1.1

# Static IP on amd64 (Intel NUC, Mini PC,…)

# ON AMD64 PC

```
$ ip link show
```

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1000
2: enp3s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP mode DEFAULT group default qlen 1000
3: wlp2s0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN mode DEFAULT group default qlen 1000

# enp3s0 is your default interface (Ethernet connection), do not use wifi for your audio server

```
$ sudo nano /etc/network/interfaces
```

# add the following lines at end:

auto enp3s0
iface enp3s0 inet static
address 192.168.x.x
netmask 255.255.255.0
network 192.168.x.x
gateway 192.168.x.x

# address = the choosen static IP address, EXAMPLE: 192.168.1.20
# network = your IPs range, EXAMPLE: 192.168.1.0
# gateway/router = your internet box LAN IP, EXAMPLe: 192.168.1.1

# CTRL+O to save
# CTRL+X to exit

```
$ sudo systemctl restart networking
```

# get the status

```
$ sudo systemctl status networking
```

# if everything okay reboot your system

```
$ sudo reboot
```

# or type this cmd below with interface name (eth0 or enp3s0 ) and reboot manually

```
$ sudo ifdown enp3s0
```

# here you’re loosing your SSH session obviously

# see troubleshooting page if static IP not working

# reboot system

# and start the NEW SSH SESSION WITH YOUR NEW STATIC IP! 😉

# STEP6
# to continue open SSH session with this time your new static IP address this time

# (click yes and accept the new certificate)

```
$ login pi
```

Click the button NEXT below to continue…