Appliance IP addresses are static by default. Hence, changing the IP address of the appliance is a 4-steps process.

1. Change the IP of a network device by editing the network configuration file. (E.g. for network card eth0)

   vi /etc/sysconfig/network-scripts/ifcfg-eth0

   Change the values of IPADDR and NETMASK fields

   ifcfg-eth0

   #My IP description
   # IPv-4
   
   DEVICE="eth0"
   NM_CONTROLLED="yes"
   ONBOOT=yes
   HWADDR=00:ee:dd:cc:bb:aa
   TYPE=Ethernet
   BOOTPROTO=static
   NAME="System eth0"
   UUID=aaaabbbb-7777-8888-9999-aaaabbbbcccc
   IPADDR= 192.168.0.100
   NETMASK=255.255.255.0

   Use the command - ip addr show to see a device's IP address

2. When the appliance is moved to a different network subnet - Change the Default gateway

   vi /etc/sysconfig/network

   Change the value of the GATEWAY field in the file

   /etc/sysconfig/network

   NETWORKING=yes
   HOSTNAME=server1.example.com
   GATEWAY=192.168.0.1
   [...]

   Use the command - ip route show to see a device's IP address

3. Change DNS name (Optional step) - DNS can be added or changed in the file /etc/resolv.conf 

   vi /etc/resolv.conf

   Change or add Domain Name Servers if required.

   resolv.conf

   [...]
   nameserver	192.168.1.1
   nameserver	192.168.1.2
   [...]

4. Restart the network service

   restart network services

   service network restart

5. Edit the /etc/hosts file

   Change all the entries referring to the old IP address to use the new IP address. For example:
   
   

   restart network services

   192.168.65.175     montier-management
   192.168.65.175     montier-syslog
   192.168.65.175     montier-wsm
   192.168.65.175     montier-ext-eth

   No need to change entries using the IP address 127.0.0.1

   
   

6. Stop and Start all system services.
7. In the web console navigate to system → nodes and edit the IP address of the agents in your data node raw.
8. Re-configure syslog for the default domain on each monitored device (the Setup Syslog for device  on the Device Management section)