Adding debian specific Static IP address changes, and hostname updates

2025-12-07 14:45:56 +13:00
parent 03fe3c8ab9
commit 37ced0534d
2 changed files with 179 additions and 0 deletions
--- a/Networking/Debian-Static_IP
+++ b/Networking/Debian-Static_IP
@@ -0,0 +1,126 @@
+**Debian Specific Static IP Address Setup**
+
+Get the interface name by looking at 
+
+```
+ip a
+```
+
+Example - here the interface we are targeting is enp1s0
+
+```
+~$ ip a
+1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
+    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
+    inet 127.0.0.1/8 scope host lo
+       valid_lft forever preferred_lft forever
+    inet6 ::1/128 scope host noprefixroute
+       valid_lft forever preferred_lft forever
+2: enp1s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
+    link/ether 52:54:00:0c:f6:e7 brd ff:ff:ff:ff:ff:ff
+    altname enx5254000cf6e7
+    inet 192.168.50.80/24 brd 192.168.50.255 scope global dynamic noprefixroute enp1s0
+       valid_lft 85984sec preferred_lft 75184sec
+    inet6 2404:4400:4181:9200:5054:ff:fe0c:f6e7/64 scope global dynamic mngtmpaddr proto kernel_ra
+       valid_lft 86366sec preferred_lft 86366sec
+    inet6 2404:4400:4181:9200:617f:906e:3877:3f00/64 scope global dynamic mngtmpaddr noprefixroute
+       valid_lft 86366sec preferred_lft 86366sec
+    inet6 fe80::b2a2:4462:bece:c8b7/64 scope link
+       valid_lft forever preferred_lft forever
+~$
+```
+
+We will be updated the interfaces file int he networking dir.  
+Before we do anything we always make a backup copy 
+
+```
+sudo cp /etc/network/interfaces /etc/network/interfaces.bak
+```
+
+looking at the interface file its shows that the interface is set to dynamic
+
+** Orginal interface file
+
+```
+# This file describes the network interfaces available on your system
+# and how to activate them. For more information, see interfaces(5).
+
+source /etc/network/interfaces.d/*
+
+# The loopback network interface
+auto lo
+iface lo inet loopback
+
+# The primary network interface
+allow-hotplug enp1s0
+iface enp1s0 inet dhcp
+# This is an autoconfigured IPv6 interface
+iface enp1s0 inet6 auto
+```
+
+We will update the ***face enp1s0 inet dhcp***
+
+section to look like this 
+
+Example of updated file
+
+# This file describes the network interfaces available on your system
+# and how to activate them. For more information, see interfaces(5).
+
+source /etc/network/interfaces.d/*
+
+# The loopback network interface
+auto lo
+iface lo inet loopback
+
+# The primary network interface
+allow-hotplug enp1s0
+iface enp1s0 inet static
+    address 192.168.50.20
+    netmask 255.255.255.0
+    gateway 192.168.50.254
+    dns-nameservers 192.168.50.254 8.8.8.8
+# This is an autoconfigured IPv6 interface
+iface enp1s0 inet6 auto
+
+After you have made this edit you can restart the service to get the new IP address
+
+```
+luddie@Node1-master:~$ ip a
+1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
+    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
+    inet 127.0.0.1/8 scope host lo
+       valid_lft forever preferred_lft forever
+    inet6 ::1/128 scope host noprefixroute
+       valid_lft forever preferred_lft forever
+2: enp1s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
+    link/ether 52:54:00:0c:f6:e7 brd ff:ff:ff:ff:ff:ff
+    altname enx5254000cf6e7
+    inet 192.168.50.20/24 brd 192.168.50.255 scope global enp1s0
+       valid_lft forever preferred_lft forever
+    inet 192.168.50.80/24 brd 192.168.50.255 scope global secondary dynamic noprefixroute enp1s0
+       valid_lft 86372sec preferred_lft 75572sec
+    inet6 2404:4400:4181:9200:617f:906e:3877:3f00/64 scope global dynamic mngtmpaddr noprefixroute
+       valid_lft 86369sec preferred_lft 86369sec
+    inet6 2404:4400:4181:9200:5054:ff:fe0c:f6e7/64 scope global dynamic mngtmpaddr proto kernel_ra
+       valid_lft 86369sec preferred_lft 86369sec
+    inet6 fe80::b2a2:4462:bece:c8b7/64 scope link
+       valid_lft forever preferred_lft forever
+luddie@Node1-master:~$
+```
+
+The network is now available via the updated ip address... HOWEVER did you see the old IP is still there?
+
+```
+inet 192.168.50.80/24 brd 192.168.50.255 scope global secondary dynamic noprefixroute enp1s0
+       valid_lft 86372sec preferred_lft 75572sec
+```
+
+Easiest way of dealing with this... 
+
+```
+sudo reboot
+
+```
+
+And when the machine comes back up, ssh using the newly statically assigned IP address.