Pfsense ipv6 outbound firewall rules on tracked interface

Pfsense ipv6 outbound firewall rules on tracked interface


 What are the functions of an IPv6 firewall?

The protection provided by an IPv6 firewall effectively filters and prevents unauthorized individuals from gaining access to confidential company data. However, in order to maximize online security and prevent data loss, it needs to be activated in the correct manner. Pfsense ipv6 outbound firewall rules on tracked interfaceare possible with DHCPv6 Prefix Delegation.

Because filtering is always performed in the inbound direction of every interface, there is never a need for outbound rules to be implemented. Having access to them can considerably cut the number of necessary firewall rules in some specific situations, such as a firewall with a large number of internal interfaces.


In this kind of scenario, you should implement egress rules for Internet traffic as outbound rules on the WAN to prevent having to duplicate them for each and every internal interface. The usage of incoming and outbound filtering may be desired in specific applications, even though it makes configurations more complicated and increases the likelihood of user mistakes.


Interface-Tracking- Pfsense ipv6 outbound firewall rules on tracked interface

Track Interface works with DHCPv6 Prefix Delegation. This option determines which interface receives ISP-delegated IPv6 addresses and, if a more significant delegation is received, which prefix is used.


Delegation of the DHCP6 prefix-Pfsense ipv6 outbound firewall rules on tracked interface

A routed IPv6 subnet is provided to a DHCP6 client through DHCP6 Prefix Delegation. It is possible to configure a WAN type interface to get a prefix with DHCP6 (DHCP6, Track Interface). A prefix delegation service can be provided to other routers within an extensive network by a router that is located at the network’s edge and is functioning correctly (DHCPv6 Prefix Delegation).


If you choose to utilize DHCP6, then the prefix delegation size will be determined by the amount of space that your ISP provides. If your Internet service provider only offers a /64, that is the most prominent IP address you can choose. Simply making a request for a DHCP6 address with no prefix is what the default setting does. For the router to function correctly, you must make a prefix request.


We are unable to speculate on this, however, because we do not know the maximum size of the prefix that the ISP will permit.

Choose Track interface WAN from the drop-down menu for the LAN interface, and enter 0 for the prefix id. This interface will not be configured if you do not enter a value of at least 0 in this box.



A list of all dynamic IPv6 WAN interfaces enabling prefix delegation (DHCPv6, PPPoE, 6rd, etc.). Choose the interface that will receive ISP subnet information.



IPv6 prefix id


If the ISP has assigned multiple prefixes via DHCPv6, the IPv6 Prefix ID governs which /64 subnet to use on this interface. Hexadecimal value.

If an ISP allocates /60, 16 /64 networks are available. Therefore prefix IDs 0 through f can be used.


Enable IPv6 in pfSense®:

Click “System” and then “Advanced.”

Click on “Networking” in the menu.

Check the box next to “Allow IPv6.”

At the bottom, click “Save.”

First, your WAN interface:

Choose “Interfaces.”

WAN stands for Wide Area Network.

Set “IPv6 Configuration Type” to “DHCP6” in the “General Configuration” area.

Set the following in the “DHCP6 Client Configuration” area:

Options -> Configuration Options: untick

Use connectivity to IPv4 as the parent interface: tick

Only ask for an IPv6 prefix: check

DHCPv6 Prefix Delegation size: 56

Send a hint about the IPv6 prefix:

Debug: untick

Don’t wait for a RA; uncheck the box.

Do not let PD/Address release: do not check the box.

Press “Save”

Second, the LAN connection- Pfsense ipv6 outbound firewall rules on tracked interface :

Read More: You may not need that C4000XG Firewall Settings

Choose “Interfaces.”

WAN stands for Wide Area Network.

Set the “IPv6 Configuration Type” to “Track Interface” in the “General Configuration” section. In the “Track IPv6 Interface” window that just popped up, do the following:

Set “IPv6 Prefix ID” to “0” and “IPv6 Interface” to “WAN.”

Let pfSense reload the interfaces after you click “Save,” and you’re done.

RFC 4890 says that you should always let the following ICMP types through:

Problem: “Destination Unreachable, Packet Too Big, Time Exceeded.”