Test if the GCP Load Balancer is working by sending a curl command from the backend VM.
Assume the load balancer IP address is 10.1.2.99, and the VM is called vm-a1.
curl http://10.1.2.99
The end result is …
Page served from: vm-a1
Make sure there’s an entry in the local table that matches the IP of the load balancer.
ip route show table local | grep 10.1.2.99
If not, add it.
ip route add to local 10.1.2.99/32 dev eth0 proto 66