In order to migrate our internal network to a dual-stack configuration, we would need to provide v6 addresses via DHCP to all remote sites.
Each site is using a Sophos UTM 9.4 gateway, all connected via RED Client/Server channels to our 2 central sites (also running UTM 9.4 gateways). Each VPN link is configured with both v4 and v6, as well as all internal interfaces.
For the central sites DHCPv6 relay works fine, we added the client networks and the server network (running the DHCPv6 server) to the appropriate UTM and the clients are requesting their IDs and prefixes just fine. For the remote sites, however, it doesn't seem to work. I added the client networks as facing-clients and the VPN networks as facing-servers to the remote UTMs and also added the VPN networks as facing-clients to the central UTMs, but the DHCPv6 request doesn't seem to get forwarded correctly.
What is the best way to trouble shoot this scenario?
Thank you,
Ronny
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