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IPv6: UTM doesn't respond to FF02::2

Hi,

We have Sophos UTM 9.2 with IPv6 enabled. We have 2A02:****:****:400::/56 subnet

Wan interface: 2a02:****:****:401::2/64
Wan gateway: 2a02:****:****:401::1/64 (Mikrotik router to ISP)

Lan interface: 2a02:***x:****:402::1/64

IPv6 works when I assign a static IPv6 address to a Windows 7 client on the lan segment of the UTM. The UTM will route it and I have internet connectivity.

But I want the clients to get the IPv6 address by them self, so I enabled the prefix advertisement on the lan interface. This however isn't working for me.

I can see the clients do router advertisements with wireshark but the UTM doesn't respond. Also when I do a multicast ping to FF02::2 (the all ipv6 routers address) the UTM doesn't respond.

I have also tested this with a Mikrotik router, it does respond to the FF02::2 ping and immediately delegates prefixes.

What can I do to make the IPv6 prefix advertisement to work? And shouldn't the UTM respond to the FF02::2 ping because it's a router?


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