linux_wiki:route_ip_traffic_and_create_static_routes [Owlbear Consulting

This page is read only. You can view the source, but not change it. Ask your administrator if you think this is wrong.
====== Route IP Traffic And Create Static Routes ======

**General Information**

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>

----

====== Linux Routing ======

Ensure IP Forwarding is enabled if using router like functionality
<code bash>
# Persistent Change that takes place upon system boot
vim /etc/sysctl.d/overrides.conf

net.ipv4.ip_forward = 1
</code>

\\
Show Route Table
<code bash>
ip route show
</code>

===== Persistent Static Route =====

Creating a persistent static route.

----

==== Option A: Use nmcli ====

Interface specific route using nmcli.
  * Create route<code bash>nmcli con mod enp0s3 +ipv4.routes 216.58.219.0/24</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>

----