+--+ +--+ ++-+
|h1+------+s1+-----+h2+
+--+ +-++ +--+
In this example we show how to verify IPv4 checksums and drop packets accordingly.
Start the topology:
sudo p4run
Start a receiver at h2:
mx h2
python receive.py
Send valid and invalid packets to h2 from h1:
mx h1
python send.py 10.0.1.2 valid/invalid
You will observe that only packets with a valid checksum get forwarded.