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No Router Advertisement after Router Solicitation Request

Hi everyone,

i have problems getting an IPv6 address on clients using SLAAC on my Sophos UTM9.510-5.

The basics are configured, I'm getting an delegated prefix which is used by clients over "Prefix Advertisement".

Periodically the UTM sends Router Advertisement Messages which contains the correct prefix. So far so good :)

The problem is there is no answer from the router if a client sends a router solicitation request on ff02::2 (multicast).

It has to wait until the router is advertising anyway on ff02::1. Usually this takes up to a minute.

Can any of you please help me?

Thanks

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