Posted on January 24, 2019 at 12:06 pm
If you need to create firewall rules related to Google Load Balancer:
You must create a firewall rule that allows traffic from 126.96.36.199/22 and 188.8.131.52/16 to reach your instances. This rule allows traffic from both the load balancer and the health checker. The rule must allow traffic on the port your global forwarding rule has been configured to use, and your health checker should be configured to use the same port. If your health checker uses a different port, then you must create another firewall rule for that port. Note that firewall rules block and allow traffic at the instance level, not at the edges of the network. They cannot prevent traffic from reaching the load balancer itself.
More information here:
* Firewall rules do not affect the LB since it sits outside the VPC network.
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