Repo Init with files

etc/dhcpcd.conf

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+# A sample configuration for dhcpcd.
+# See dhcpcd.conf(5) for details.
+
+# Allow users of this group to interact with dhcpcd via the control socket.
+#controlgroup wheel
+
+# Inform the DHCP server of our hostname for DDNS.
+hostname
+
+# Use the hardware address of the interface for the Client ID.
+clientid
+# or
+# Use the same DUID + IAID as set in DHCPv6 for DHCPv4 ClientID as per RFC4361.
+# Some non-RFC compliant DHCP servers do not reply with this set.
+# In this case, comment out duid and enable clientid above.
+#duid
+
+# Persist interface configuration when dhcpcd exits.
+persistent
+
+# Rapid commit support.
+# Safe to enable by default because it requires the equivalent option set
+# on the server to actually work.
+option rapid_commit
+
+# A list of options to request from the DHCP server.
+option domain_name_servers, domain_name, domain_search, host_name
+option classless_static_routes
+# Respect the network MTU. This is applied to DHCP routes.
+option interface_mtu
+
+# Most distributions have NTP support.
+#option ntp_servers
+
+# A ServerID is required by RFC2131.
+require dhcp_server_identifier
+
+# Generate SLAAC address using the Hardware Address of the interface
+#slaac hwaddr
+# OR generate Stable Private IPv6 Addresses based from the DUID
+slaac private
+
+# Example static IP configuration:
+interface usb0
+static ip_address=10.55.0.1/29
+nohook wpa_supplicant   # don't call the wpa_supplicant hook
+denyinterfaces usb0    # don't send DHCP requests
+#static ip6_address=fd51:42f8:caae:d92e::ff/64
+#static routers=192.168.0.1
+#static domain_name_servers=192.168.0.1 8.8.8.8 fd51:42f8:caae:d92e::1
+
+# It is possible to fall back to a static IP if DHCP fails:
+# define static profile
+#profile static_eth0
+#static ip_address=192.168.1.23/24
+#static routers=192.168.1.1
+#static domain_name_servers=192.168.1.1
+
+# fallback to static profile on eth0
+#interface eth0
+#fallback static_eth0

etc/dnsmasq.conf

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+dhcp-authoritative
+dhcp-rapid-commit
+no-ping
+interface=usb0
+dhcp-range=10.55.0.2,10.55.0.6,255.255.255.248,1h
+dhcp-option=3,10.55.0.1
+leasefile-ro

etc/network/interfaces.d/wlan0

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+auto wlan0
+allow-hotplug wlan0
+iface wlan0 inet dhcp
+wpa-conf /etc/wpa_supplicant/wpa_supplicant.conf

etc/sysctl.conf

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+#
+# /etc/sysctl.conf - Configuration file for setting system variables
+# See /etc/sysctl.d/ for additional system variables.
+# See sysctl.conf (5) for information.
+#
+
+#kernel.domainname = example.com
+
+# Uncomment the following to stop low-level messages on console
+#kernel.printk = 3 4 1 3
+
+##############################################################3
+# Functions previously found in netbase
+#
+
+# Uncomment the next two lines to enable Spoof protection (reverse-path filter)
+# Turn on Source Address Verification in all interfaces to
+# prevent some spoofing attacks
+#net.ipv4.conf.default.rp_filter=1
+#net.ipv4.conf.all.rp_filter=1
+
+# Uncomment the next line to enable TCP/IP SYN cookies
+# See http://lwn.net/Articles/277146/
+# Note: This may impact IPv6 TCP sessions too
+#net.ipv4.tcp_syncookies=1
+
+# Uncomment the next line to enable packet forwarding for IPv4
+net.ipv4.ip_forward=1
+
+# Uncomment the next line to enable packet forwarding for IPv6
+#  Enabling this option disables Stateless Address Autoconfiguration
+#  based on Router Advertisements for this host
+#net.ipv6.conf.all.forwarding=1
+
+
+###################################################################
+# Additional settings - these settings can improve the network
+# security of the host and prevent against some network attacks
+# including spoofing attacks and man in the middle attacks through
+# redirection. Some network environments, however, require that these
+# settings are disabled so review and enable them as needed.
+#
+# Do not accept ICMP redirects (prevent MITM attacks)
+#net.ipv4.conf.all.accept_redirects = 0
+#net.ipv6.conf.all.accept_redirects = 0
+# _or_
+# Accept ICMP redirects only for gateways listed in our default
+# gateway list (enabled by default)
+# net.ipv4.conf.all.secure_redirects = 1
+#
+# Do not send ICMP redirects (we are not a router)
+#net.ipv4.conf.all.send_redirects = 0
+#
+# Do not accept IP source route packets (we are not a router)
+#net.ipv4.conf.all.accept_source_route = 0
+#net.ipv6.conf.all.accept_source_route = 0
+#
+# Log Martian Packets
+#net.ipv4.conf.all.log_martians = 1
+#
+
+###################################################################
+# Magic system request Key
+# 0=disable, 1=enable all, >1 bitmask of sysrq functions
+# See https://www.kernel.org/doc/html/latest/admin-guide/sysrq.html
+# for what other values do
+#kernel.sysrq=438
+

etc/wpa_supplicant/wpa_supplicant.conf

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+ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
+update_config=1
+
+country=FR
+network={
+        ssid="<YOUR-SSID>"
+        psk="<YOUR-PASSPHRASE>"
+        key_mgmt=WPA-PSK
+}