Hi  @itkairos 

IPv6 addresses that begin with “fe80” are IPv6 link - local address.

1. **Explanation of Address Type** - IPv6 addresses are divided into various types, and the link - local address is one of them. This type of address is mainly used for communication on a single link, such as a local local - area - network (LAN) segment.  Its function is similar to the Automatic Private IP Addressing (APIPA) addresses (169.254.x.x) in IPv4, which is used to enable communication between devices within the local - link range when there is no other configuration.

2. **Application Scenarios** - In a local network, devices use link - local addresses to discover other devices or for some local network - service discovery. For example, when a global unicast IPv6 address is not configured or during the network - initialization stage, devices can use link - local addresses to perform operations of the Neighbor Discovery Protocol (NDP). Through NDP, devices can discover each other's link - layer addresses and check the reachability of addresses, which is very important for building local - network connections.

3. **Difference from Other Addresses** - Compared with global unicast IPv6 addresses, the scope of link - local addresses is limited to the local link. Global unicast addresses can be used for communication across the Internet, while link - local addresses are mainly used for communication within the local network and cannot be directly used to access the Internet. If a device wants to access an external network such as the Internet, it usually needs to obtain a global unicast IPv6 address or use some Network Address Translation (NAT - Pt and similar techniques) to achieve this.

@itkairos 

As for the LAN3 feedback, we are aware of this now. 

The workaround is to change it as a WAN port first, then configure it as a LAN port again.

Thanks for the feedback, we will fix it soon.