Adding an IP Address and a Static Route

Using sudo -i, start an interactive root shell:

sudo -i

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

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

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.