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1.11. Enabling traffic forwarding between different interfaces or sources within a firewalld zone

Intra-zone forwarding is a firewalld feature that enables traffic forwarding between interfaces or sources within a firewalld zone.

With intra-zone forwarding enabled, the traffic within a single firewalld zone can flow from one interface or source to another interface or source. The zone specifies the trust level of interfaces and sources. If the trust level is the same, the traffic stays inside the same zone.

注意

Enabling intra-zone forwarding in the default zone of firewalld, applies only to the interfaces and sources added to the current default zone.

firewalld uses different zones to manage incoming and outgoing traffic. Each zone has its own set of rules and behaviors. For example, the trusted zone allows all forwarded traffic by default.

Other zones can have different default behaviors. In standard zones, forwarded traffic is typically dropped by default when the target of the zone is set to default.

To control how the traffic is forwarded between different interfaces or sources within a zone, make sure you understand and configure the target of the zone accordingly.

You can use intra-zone forwarding to forward traffic between interfaces and sources within the same firewalld zone.

This feature brings the following benefits:

  • Seamless connectivity between wired and wireless devices (you can forward traffic between an Ethernet network connected to enp1s0 and a Wi-Fi network connected to wlp0s20)
  • Support for flexible work environments
  • Shared resources that are accessible and used by multiple devices or users within a network (such as printers, databases, network-attached storage, and others)
  • Efficient internal networking (such as smooth communication, reduced latency, resource accessibility, and others)

You can enable this functionality for individual firewalld zones.

For more details, see the firewalld.zones(5) man page on your system.

Procedure

  1. Enable packet forwarding in the kernel: 

    # echo "net.ipv4.ip_forward=1" > /etc/sysctl.d/95-IPv4-forwarding.conf
# sysctl -p /etc/sysctl.d/95-IPv4-forwarding.conf

  2. Ensure that interfaces between which you want to enable intra-zone forwarding are assigned only to the internal zone: 

    # firewall-cmd --get-active-zones

  3. If the interface is currently assigned to a zone other than internal, reassign it: 

    # firewall-cmd --zone=internal --change-interface=interface_name --permanent

  4. Add the enp1s0 and wlp0s20 interfaces to the internal zone: 

    # firewall-cmd --zone=internal --add-interface=enp1s0 --add-interface=wlp0s20

  5. Enable intra-zone forwarding: 

    # firewall-cmd --zone=internal --add-forward

Verification

  1. Log in to a host that is on the same network as the enp1s0 interface of the host on which you enabled zone forwarding.

  2. Start an echo service with ncat to test connectivity: 

    # ncat -e /usr/bin/cat -l 12345
  3. Log in to a host that is in the same network as the wlp0s20 interface.

  4. Connect to the echo server running on the host that is in the same network as the enp1s0: 

    # ncat <other_host> 12345
  5. Type something and press Enter. Verify the text is sent back.
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