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--- multiple_ip_addresses_on_single_interface [2023/11/13 17:05] – [The Better Method] walkeradmin
+++ multiple_ip_addresses_on_single_interface [2023/11/13 17:26] (current) – [The Better Method] walkeradmin
@@ Line 109: / Line 109: @@
 \\
 In the directory /etc/sysconfig/network-scripts we can see in this example we two interfaces:
-\\
 \\
 <file>
@@ Line 124: / Line 123: @@
 \\
 \\
+Now we have three configuration files for interface <color #ed1c24>eno1</color>.
+\\
+\\
+<color #ed1c24>-rw-r--r--. 1 root root 255 Nov 13 17:01 ifcfg-eno1</color>\\
+<color #00a2e8>-rw-r--r--. 1 root root 255 Nov 13 17:04 ifcfg-eno1:0</color> (Alias 1)\\
+<color #22b14c>-rw-r--r--. 1 root root 255 Nov 13 17:06 ifcfg-eno1:1</color> (Alias 2)\\
+\\
+Each one of these interface files will contain the specific IP Address details that are required, but they will all be associated with a single interface. The <color #ed1c24>ifcfg-eno1</color> file is the main interface configuration file and the other two files <color #00a2e8>ifcfg-eno1:0</color> and <color #22b14c>ifcfg-eno1:1</color> only contain the extra information, these are known as aliases.
+\\
+\\
+**<color #ed1c24>ifcfg-eno1</color>** - In this file we have all of the primary IP Address details:
+\\
+<file>
 TYPE=Ethernet
 PROXY_METHOD=none
@@ Line 147: / Line 151: @@
 IPV6_DISABLED=yes
 IPV6INIT=no
+</file>
+In the next two files, we just enter the additional information:
+\\
+\\
+**<color #00a2e8>ifcfg-eno1:0</color>**
+\\
+<file>
+NAME=eno1
+UUID=ca90417f-9df9-4f34-bae5-77aa6531cc00
+DEVICE=eno1:0
+ONBOOT=yes
+IPADDR=10.32.13.233
+PREFIX=24
+GATEWAY=10.32.13.1
+PREFIX1=24
+</file>
+\\
+**<color #22b14c>ifcfg-eno1:1</color>**
+<file>
+NAME=eno1
+UUID=ca90417f-9df9-4f34-bae5-77aa6531cc00
+DEVICE=eno1:1
+ONBOOT=yes
+IPADDR=137.1.0.100
+PREFIX=24
+GATEWAY=137.1.0.1
+PREFIX1=24
+</file>
+Play close attention to the **DEVICE** setting, you must set the name to match the interface file name (so for file <color #22b14c>ifcfg-eno1:1</color> the **DEVICE** name must be <color #22b14c>eno1:1</color>)
+\\
+\\
+After rebooting the unit, we can now see that there are three IP Addresses on interface ifcfg-eno1.
+\\
+\\
+Using ip -br -c a to show the IP Addresses:
+\\
+\\
+eno1   UP   <color #ed1c24>192.168.1.223</color>/24 1<color #00a2e8>0.32.13.223</color>/24 <color #22b14c>130.1.0.233</color>/24
+\\
+\\
+If we perform an ip route:
+\\
+<file>
+default via 192.168.1.1 dev eno1 proto static metric 101
+.32.13.0/24 dev eno1 proto kernel scope link src 10.32.13.223 metric 101
+.1.0.0/24 dev eno1 proto kernel scope link src 130.1.0.233 metric 101
+.168.1.0/24 dev eno1 proto kernel scope link src 192.168.1.223 metric 101
+.0.0.0/16 dev eno2 proto kernel scope link src 11.0.223.2 metric 102
+</file>
+We can see that the default route is still via **eno1**, and that the other alias IP Addresses are still going via **eno1**.
+\\
+\\