Has anyone swapped a BT hub with an MT992 modem and managed to get ipv6 working, preferably on g.fast?
I've just replaced my smart hub 2 (which got an ipv6 connection no problem, screenshot below) with an MT992 in front of my Unifi USG.
I can get ipv4 pppoe working no problem but I cannot get an ipv6 address no matter what I try.
In the USG there are 2 ipv6 WAN options, static ipv6 address or DHCPv6 DP. I've tried requesting a /56 or a /64 PD but no joy.
Output from tcpdump on my USG below. I'm not having much luck on the Unifi forums as I think this may be a BT specific problem?
tcpdump: listening on pppoe0, link-type LINUX_SLL (Linux cooked), capture size 262144 bytes 11:59:39.662773 IP6 (hlim 1, next-header UDP (17) payload length: 64) fe80::fde8:1b29:524a:2acd.546 > ff02::1:2.547: [udp sum ok] dhcp6 solicit (xid=438d15 (client-ID hwaddr/time type 1 time 662061098 74acb935f2b5) (IA_NA IAID:0 T1:0 T2:0) (rapid-commit) (elapsed-time 0) (option-request DNS-server DNS-search-list)) 11:59:39.665831 IP6 (class 0xc0, hlim 255, next-header UDP (17) payload length: 101) fe80::221:5ff:fe70:8434.547 > fe80::fde8:1b29:524a:2acd.546: [udp sum ok] dhcp6 reply (xid=438d15 (server-ID hwaddr type 1 002105708434) (client-ID hwaddr/time type 1 time 662061098 74acb935f2b5) (rapid-commit) (IA_NA IAID:0 T1:0 T2:0 (status-code no addresses)))
For reference this is what my smart hub 2 used to show:
Solved! Go to Solution.
You will only get a link local address on the WAN
Have a look at this thread https://community.bt.com/t5/Home-setup-Wi-Fi-network/IPv6-amp-pfSense-with-BT-FTTP/td-p/2080812
As the MT992 has no interface to tap into how do I know it's not the modem at fault?
Because the modem doesn't deal with the IP layer.
OK I have solved this temporarily with the following via ssh into my USG
configure set interfaces ethernet eth0 pppoe 0 dhcpv6-pd prefix-only commit save
I just need to work it into my existing config.gateway.json now to make it permanent...
/56 PD is indeed the right size.