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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
Linux Routing
Ensure IP Forwarding is enabled if using router like functionality
# Persistent Change that takes place upon system boot vim /etc/sysctl.d/overrides.conf net.ipv4.ip_forward = 1
Show Route Table
ip route show
Persistent Static Route
Creating a persistent static route.
Option A: Use nmcli
Interface specific route using nmcli.
- Create route
nmcli con mod enp0s3 +ipv4.routes 216.58.219.0/24
- Bring up the new connection config
nmcli con up enp0s3
- Verify route
ip route show
Option B: Use nmtui
- Open nmtui
nmtui
- 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
systemctl restart network
- View route
ip route show
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
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
- 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
systemctl restart network
- View route
ip route show