Network traffic may be affected after you enable VPC Firewall. However, network traffic is not affected after you enable Internet Firewall.
When you create a VPC firewall, Cloud Firewall automatically creates routes so that traffic can be directed to the VPC firewall. Network jitter may occur when traffic is directed to the VPC firewall.
- Whether your VPCs support automatic retransmission. If your VPCs use TCP-based networking, they support automatic retransmission.
- Whether the persistent connections of your VPCs support reconnection.
- Whether the traffic between your VPCs is large.