====== Static and Dynamic IP on a Single Interface ======
<color #db5f0b>Oct 2017</color>
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===== Introduction =====
During the configuration of an MFEL (CentOS 7.2, MFEL 7x) I suddenly lost connection. After some investigation i noticed that my control interface had two addresses. When I did an <color #ed1c24>ip a</color> on the interface, I saw something similar to the section below.
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<file>
6: enp4s0f0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP qlen 1000
    link/ether 00:1e:67:eb:69:4c brd ff:ff:ff:ff:ff:ff
    inet 10.43.3.67/19 brd 10.43.31.255 scope global enp4s0f0
       valid_lft forever preferred_lft forever
    inet 10.43.2.244/22 brd 10.43.2.254 scope dynamic enp4s0f0
       valid_lft forever preferred_lft forever
</file>
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I tried to add <color #ed1c24>NM_Controlled=no</color> to the interface configuration file, but that didn't help. So in the end I had to disable the built in Network Manager, which to be honest we don't use because our interfaces are always set to Static.
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==== Disable Network Manager ====
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To disable the Network Manager, at the CLI, enter the following:
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<file>
systemctl disable NetworkManager.service
systemctl stop NetworkManager.service
systemctl restart network
</file>
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I did a reboot and confirmed that I now only had the Static IP that I had configured in my interface configuration file (/etc/sysconfig/network-scripts/ifcfg-enp4s0f0)
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