GCP VPC

Default firewall actions

• Every network has an implied deny firewall rule for ingress traffic.
• Unless overridden by a higher priority rule, the implied allow rule for egress traffic permits outbound traffic from all instances.

ICMP firewall rules

• ICMP_PROTOCOL: the ICMP protocol type. Specify ICMPv4 by using the protocol name icmp or protocol number 1. Specify ICMPv6 by using protocol number 58.

References

• https://cloud.google.com/vpc/docs/vpc#firewall_rules