Adding an IP Address and a Static Route

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Adding an IP Address and a Static Route

Managing network settings is a crucial ability for a System Administrator to have. In today's environment, adding and deleting IP addresses and static routes is an expected capability. In this activity, we will be creating one script to add an IP address and a static route, then another script to remove an IP address and a static route.

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Lab Info

Level

Intermediate

Last updated

Sep 25, 2025

Duration

30m

Challenge

Use the sudo Command to Start a Root Account Shell
Using sudo -i, start an interactive root shell:
```
sudo -i
```
Challenge

Add and Delete the IP Address 10.0.5.20/24 from the eth0 Interface, and Create net-up.sh and net-down.sh Scripts
Using the ip a command, add and delete the address 10.0.5.20/24 from the ens5 interface. Use these commands to create the net-up.sh and net-down.sh scripts:
```
ip a
ip a add 10.0.5.20/24 dev ens5
ip a
echo ip a add 10.0.5.20/24 dev ens5 > net-up.sh
chmod +x net-up.sh
ip a del 10.0.5.20/24 dev ens5
ip a
echo ip a del 10.0.5.20/24 dev ens5 > net-down.sh
chmod +x net-down.sh
./net-up.sh
ip a 
./net-down.sh
ip a
```
Challenge

Update net-up.sh and net-down.sh Scripts to Add and Delete Route Using 10.0.5.5 as a Router to Provide Access to the 10.0.6.0/24 Network
Using the ip r command add a route to the 10.0.6.0 subnet using 10.0.5.5 as a router with the ens5 device. Add this command to the net-up.sh script file. Delete the new route using the ip r command, and add it to the net-down.sh script.
```
ip r
ip r add 10.0.6.0/24 via 10.0.5.5 dev ens5
ip r
echo ip r add 10.0.6.0/24 via 10.0.5.5 dev ens5 >> net-up.sh
ip r del 10.0.6.0/24 via 10.0.5.5 dev ens5
echo ip r del 10.0.6.0/24 via 10.0.5.5 dev ens5 >> net-down.sh
ip r
```
Challenge

Verify the net-up.sh Script Adds the Correct Address and Route, and net-down.sh Script Deletes the Address and Route
Execute the net-down.sh script. Check the current IP address information and it should not contain 10.0.5.20. If it does, try fixing net-down.sh until it does not:
```
./net-down.sh
ip a | grep 10.0.5.20
```
Check the routing table and it should not have the router 10.0.5.5. If it does, try fixing the net-down.sh until it does not:
```
ip r | grep 10.0.5.5
```
Execute the net-up.sh script:
```
./net-up.sh
```
Check the current IP address information, and it and should contain 10.0.5.20. If it does not, try fixing net-up.sh until it does:
```
ip a | grep 10.0.5.20
```
Check the routing table and it should have the router 10.0.5.5. If it does not, try fixing the net-up.sh until it does:
```
ip r | grep 10.0.5.5
```
Double-check our work by repeating the previous steps in this task.

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