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Forum Discussion

coolwifi's avatar
coolwifi
Apprentice
Dec 19, 2025

RS500 - Hates custom ipv6 LAN interface ID

I am able to setup a custom LAN ipv6 interface ID of the router from the ipv6 setup, but the connected client devices lose the ipv6 addresses when doing so. Everything works perfectly when the ipv6 L...
rs500
StephenB's avatar
StephenB
Guru - Experienced User
Dec 20, 2025
coolwifi wrote:

I am able to setup a custom LAN ipv6 interface ID of the router from the ipv6 setup, but the connected client devices lose the ipv6 addresses when doing so

Does it work if you assign the same interface ID that you are getting from your ISP?  Though this can be tricky, since you might get a new IID when the lease expires.

  • coolwifi's avatar
    coolwifi
    Apprentice
    Dec 20, 2025

    ISP doesn't assign the interface ID on the LAN side, it only provides the /64 prefix for the router LAN. For now the issue seems to be resolved with a reboot. I am setting up my own interface ID rather than using the router generated interface ID from it's mac address for simplicity and reaching the router ipv6 address locally.