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--- linux_wiki:route_ip_traffic_and_create_static_routes [2016/08/08 23:39]
billdozor [Persistent Static Route]
+++ linux_wiki:route_ip_traffic_and_create_static_routes [2019/05/25 23:50] (current)
@@ Line 4: / Line 4: @@
 Routing IP traffic and creating static routes.
+----
+====== Lab Setup ======
+The following virtual machines will be used:
+  * server1.example.com (192.168.1.150) -> Configure the routes here
+----
+====== Help ======
+Finding help in this section.
+  * nmcli examples<code bash>man nmcli-examples</code>
 ----
@@ Line 9: / Line 23: @@
 ====== Linux Routing ======
-Show Route Table
+Ensure IP Forwarding is enabled if using router like functionality
 <code bash>
-ip route show
+# Persistent Change that takes place upon system boot
-</code>
+vim /etc/sysctl.d/overrides.conf
-\\
+net.ipv4.ip_forward = 1
-Create static route (NOT persistent)
-<code bash>
-ip route add 216.58.217.0/24 via 192.168.1.254 dev eth1
 </code>
-  * 216.58.217.0/24 -> destination network
-  * via 192.168.1.254 -> use this gateway
-  * dev eth1 -> use this interface
 \\
-Remove static route
+Show Route Table
 <code bash>
-ip route delete 216.58.217.0/24 via 192.168.1.254 dev eth1
+ip route show
 </code>
-\\
 ===== Persistent Static Route =====
-Create config file (per interface routes)
+Creating a persistent static route.
-<code bash>
-vim /etc/sysconfig/network-scripts/route-eth0
-.58.217.0/24 via 192.168.1.254 dev eth0
+----
-</code>
-  * 216.58.217.0/24 -> traffic to this destination
-  * via 192.168.1.254 -> use this gateway
-  * dev eth0 -> use this device
-\\
+==== Option A: Use nmcli ====
-Restart the network service
-<code bash>
+Interface specific route using nmcli.
-systemctl restart network
+  * Create route<code bash>nmcli con mod enp0s3 +ipv4.routes 216.58.219.0/24</code>
-</code>
+  * Bring up the new connection config<code bash>nmcli con up enp0s3</code>
+  * Verify route<code bash>ip route show</code>
+----
+==== Option B: Use nmtui ====
+  * Open nmtui<code bash>nmtui</code>
+  * Enter on "Edit a connection"
+  * Select the target network interface to use, press Enter.
+    * Scroll down to "Routing", Enter on "<Edit...>"
+    * Enter on "<Add...>"
+      * Type the Destination/Prefix
+      * Next Hop
+      * Optional Metric (default static is 0)
+    * Tab to <OK> and press 'Enter'
+  * Scroll to the bottom and Enter on "<OK>"
+  * Tab over to <QUIT>
+  * File is created at: /etc/sysconfig/network-scripts/route-<ifname>
+  * Restart the network service<code bash>systemctl restart network</code>
+  * View route<code bash>ip route show</code>
+----
+==== Option C: Use a static config file ====
+**Note**: This method is considered "legacy", but if it works, that is all that matters on the exam.
+  * Create config file<code bash>vim /etc/sysconfig/static-routes
+# Minimal route entry
+any net 216.58.217.0/24 gw 192.168.1.254
+# Can also specify a device to use for the route
+any net 216.58.217.0/24 gw 192.168.1.254 dev eth0
+# Can also specify a route metric
+any net 216.58.217.0/24 gw 192.168.1.254 dev eth0 metric 110</code>
+    * any -> source from any
+    * net 216.58.217.0/24 -> traffic to this network destination
+    * gw 192.168.1.254 -> use this gateway
+    * **OPTIONAL**: dev eth0 -> use this device
+  * Restart the network service<code bash>systemctl restart network</code>
+  * View route<code bash>ip route show</code>
 ----