Help Center/ Cloud Firewall/ User Guide/ CFW Protection/ Enabling VPC Border Traffic Protection/ Managing VPC Border Firewalls/ Modifying a Private CIDR Block
Updated on 2025-09-24 GMT+08:00
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Modifying a Private CIDR Block

To use public network CIDR blocks other than 10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16, or the 100.64.0.0/10 segment reserved for carrier-level NAT as private network CIDR blocks, modify the CIDR private network segment or submit a service ticket to expand your private IP CIDR blocks; otherwise, CFW may fail to forward traffic between your VPCs.

Modifying a Private CIDR Block

  1. Log in to the CFW console.
  2. Click in the upper left corner of the management console and select a region or project.
  3. (Optional) Switch to another firewall instance. Select a firewall from the drop-down list in the upper left corner of the page.
  4. In the navigation pane, choose Assets > Inter-VPC Border Firewalls.
  5. Click Edit Private IP Address Segment next to Custom Private IP Address Segment.

Related Operations

Parent Topic: Managing VPC Border Firewalls