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--- wiki:static_and_dynamic_ip_on_a_single_interface [2017/10/16 21:21] – created walkeradmin
+++ wiki:static_and_dynamic_ip_on_a_single_interface [2023/03/09 22:35] (current) – external edit 127.0.0.1
@@ Line 1: / Line 1: @@
+====== Static and Dynamic IP on a Single Interface ======
+<color #db5f0b>Oct 2017</color>
+\\
+\\
+----
+===== 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.
+\\
-: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN
+<file>
-    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
-: ens513f0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP qlen 1000
-    link/ether 00:1e:67:f2:75:66 brd ff:ff:ff:ff:ff:ff
-    inet 10.0.3.67/24 brd 10.0.3.255 scope global ens513f0
-       valid_lft forever preferred_lft forever
-: ens513f1: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN qlen 1000
-    link/ether 00:1e:67:f2:75:67 brd ff:ff:ff:ff:ff:ff
-: ens513f2: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN qlen 1000
-    link/ether 00:1e:67:f2:75:68 brd ff:ff:ff:ff:ff:ff
-: ens513f3: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN qlen 1000
-    link/ether 00:1e:67:f2:75:69 brd ff:ff:ff:ff:ff:ff
 : 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
-: enp4s0f3: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN qlen 1000
+    inet 10.43.2.244/22 brd 10.43.2.254 scope dynamic enp4s0f0
-    link/ether 00:1e:67:eb:69:4d brd ff:ff:ff:ff:ff:ff
+       valid_lft forever preferred_lft forever
+</file>
+\\
+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.
+\\
+\\
+==== Disable Network Manager ====
+\\
+To disable the Network Manager, at the CLI, enter the following:
+\\
+<file>
+systemctl disable NetworkManager.service
+systemctl stop NetworkManager.service
+systemctl restart network
+</file>
+\\
+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)
+\\
+\\