Some networks have no DHCP server at all, and in that case you can pick any free IP you want with the instructions below.
Open the file /etc/network/interfaces in the nano text editor: # This file describes the network interfaces available on your system # and how to activate them. source /etc/network/interfaces.d/* # The loopback network interface auto lo iface lo inet loopback # The primary network interface auto ens192 iface ens192 inet static address 192.168.70.2 netmask 255.255.255.0 network 192.168.70.0 broadcast 192.1 gateway 192.1 # dns-* options are implemented by the resolvconf package, if installed dns-nameservers 192.1 Press ctrl x, then press y, and then press enter, to save and exit the file.
Even though the interface will work if classless is entered, the system might have problems in communicating with other network devices as they have a classful subnet mask.
Refer to the Wikipedia article on Classful network to check in which class your IP address lies.
If it is called something else in your system, obviously make allowances for this and adjust things as necessary.
If you have successfully changed the IP address, and you can gain access via SSH to the server, but the Access Server web services are not responding, it is possible you had your Access Server configured to listen to a very specific IP address, and if you have changed this, then the Access Server web services won't start.This is pretty useful when you need multiple IP addresses but you have only one network card.The program dhclient will get you the IP to the given interface using the Dynamic Host Configuration Protocol (DHCP).Means you will lose that IP and will get an other different IP assigned after reboot.To make this IP permanent we have to edit the configuration files. But if you have a headless server running on a physical server, or on Hyper V, ESXi, and so on, you can use this guide to set a static IP address.The process is relatively straightforward, there is a text file that contains the configuration for your network interfaces.It is also important to note that if you have a DHCP server in your network you can also choose to use the DHCP reservation option there (if present) to always assign the same DHCP IP address to this server. In such a case you can do a static IP address assignment in the Linux server operating system itself with the instructions below, but please then do not configure the static IP to one inside of the DHCP range, but outside of it.Otherwise the DHCP server may consider the IP address you have chosen for your server suitable for assignment to a DHCP client, and that can cause an IP address conflict.Assigning the IP address in Linux requires you to edit the network configuration file.The network interface files are located at different places according the Linux OS variant.