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Knowledge Center

Why don't my firewall rules have any effect?

Last updated:Mar 16, 2022

Why don't my firewall rules have any effect?

Symptoms

Your firewall rules do not allow/block access as desired.

Environment

Synology Router: SRM 1.3 or above.

Diagnosis

Synology Router's firewall rules cannot regulate access attempts within a local network. Nor can they be applied to private network's IP addresses if their network interface is not specified.

For example, firewall rules will not be effective when set up in the following ways:

  • Scenario 1
    • The source and destination interfaces are set as All.
    • The source IP and destination IP are within the same local network, e.g., Primary Network.
  • Scenario 2
    • The source and destination interfaces are the same, e.g., Primary Network. Also, the source/destination IPs are within the same local network.1
  • Scenario 3
    • The source interface is set as All, but the source IP is set as one or a range of private IP addresses, "192.168.0.6".

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Note:

  1. To block communication between two devices, we suggest connecting them to different local networks and creating firewall rules.