Why does Scapy cause network to stop working?

Question

When performing a scan of my primary interface's network, I notice that the SSH console stops responding until the scan is over.

Lets use this example:

import scapy.all as scapy

scapy.arping("10.0.0.0/24")

While this is running, I have a continuous ping running in the background, and that stops until the python script is finished.

If I perform this same test on another interface that is not the primary interface, such as a secondary network: 192.168.1.0/24 then I do not have this problem.

1. Can someone explain why this happens?

2. How can this be avoided?