PfSense getting flooded with DHCPv6 requests on WAN

  • Hi everyone,

    I just noticed that my PfSense box is getting absolutely flooded with DHCPv6 requests on it's WAN interface:


    The source address appears to be a link-local address acting as a DHCPv6 client trying to access a link-local DHCP agent. However, both DHCPv6 relay and server are disabled on the box. Also, the WAN IPv6 configuration type is set to "None".

    Does anyone have an idea what's going on here? Could this be the fiber modem trying to get an IPv6 address or something on my ISPs side that is misconfigured? Or did I mess something up in the PfSense settings?

  • Rebel Alliance Developer Netgate

    You may not use IPv6, but other devices on that segment might.

    Capture the traffic and take a closer look at the source. See if it's from a MAC address on your network, or on the ISP gear.

    It's likely some other client on the same WAN segment making the requests. Depending on how the ISP has constructed their network, it might be another customer on the same segment as you.

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