Then check if your FG can reach ipv6 hosts externally. In this situation, the internal hosts receive their ipv6 but cant reach the internet. Here are the steps I've taken to find my error. Set ip6-other-flag Again,I remember playing with these parameters because they where mentioned on various forums but it works without them. I have played with the "set dhcp6-prefix-hint" before but it looks like this setting is not necessary. Im not entirely sure we are facing the same problem. I'll keep you updated on my own config and let you know if find anything more interesting! Good luck, Andy. I see on the beta forum there someone questioning the routing of IPv6 in this type of configuration. I had been on 5.6 Beta 3 (as part of the 5.6 Beta programme) but rolled back to see if that made any difference. It almost seems like the wan interface (with the delegated subnet) doesn't have a valid address or something and therefore doesn't show up as a valid route in the routing table. The routing table shows the internal sub-nets as connected, but nothing towards the internet. However, I dont seem to have a valid outoging route. I can setup delegated subnets to internal ports and that seems to be working with internal devices getting valid IPv6 addresses in the delegated range. I'm currently on 5.4.4 and have got to the point now that I can see an IPv6 prexfix being delegated. Certainly not as easy as it could or should be. Set estimated-downstream-bandwidth 900000īart, Yes, my experiences have been pretty frustrating so far. When I sniff on the wan interface I can see the RA's from the upstream router and DHCPv6 solicit messages originating form the FortiGate. This setup is previously validated on a Ubiquiti EdgeRouter and working. None of this is happening, and I can't see where it goes wrong. Getting the IPv6 prefix delegated is done over DHCPv6, the DHCPv6 server should then assign a /56 prefix. Normally, once the PPP session is established, the FG should use IPv6CP to allocate an IP address to the (wan) interface. On the IPv6 side on the other hand I do not receive any IP. The wan interface is in PPPOE mode and receives it IPv4 address, so far so good. The dsl-modem is in PPPoE passthrough mode (bridge), ISP is Proximus (belgium). I'm trying to setup a FortiGate 51E at home on a vdsl-Line with dual-stack IPv4/IPv6.