A quick reminder. When using a CentOS machine on network with a DDNS then in order for the host name to appear correctly on the DDNS managed local zones, create or edit the file
/etc/sysconfig/network-scripts/ifcfg-deviceID where deviceID is the actual device name of your network interface e.g. eth0, wlan0 etc. Make sure that the line DHCP_HOSTNAME appears as shown below
DHCP_HOSTNAME="my-machine"NAME="System eth0" BROADCAST=255.255.255.255 ONBOOT=yes
There can be one
ifcfg-XXX file per network interface. That way you can have two different names for the same machine connecting to the same network using different network cards like Ethernet and Wi-fi.