Help Needed with IPv6 Configuration on FortiWiFi 40F

[ocastillocoopelessca]

Hi everyone,

I'm facing an issue that I need help resolving. I'm trying to configure a FortiWiFi 40F to distribute the IPv6 ::/56 prefix provided by my Starlink High Performance connection. I believe you might know how to set this up

I’ve checked some resources(https://docs.fortinet.com/document/fortigate/7.6.2/administration-guide/37673/ipv6-prefix-delegation), but they haven’t helped me successfully propagate IPv6 on the FortiWiFi 40F. I’ll attach the configuration script for your reference.

I really appreciate any assistance you can provide.

Best regards 

Octavio

FortiWiFi-40F-3G4G (interface) # edit wan

FortiWiFi-40F-3G4G (wan) # config ipv6

FortiWiFi-40F-3G4G (ipv6) # show
config ipv6
set ip6-mode dhcp
set ip6-allowaccess ping
set dhcp6-prefix-delegation enable
config dhcp6-iapd-list
edit 1
set prefix-hint ::/56
next
end
end

FortiWiFi-40F-3G4G (ipv6) # get
ip6-mode : dhcp
nd-mode : basic
ip6-address : ::/0
ip6-allowaccess : ping
icmp6-send-redirect : enable
ra-send-mtu : enable
ip6-reachable-time : 0
ip6-retrans-time : 0
ip6-hop-limit : 0
dhcp6-prefix-delegation: enable
delegated-prefix iaid 1 : 2605:59c8:727a:100::/56
preferred-life-time : 150
valid-life-time : 300
delegated-DNS1 : 2606:4700:4700::1111
delegated-DNS2 : 2001:4860:4860::8888
delegated-domain :
cli-conn6-status : 1
vrrp-virtual-mac6 : disable
vrip6_link_local : ::
ip6-dns-server-override: enable
Acquired DNS1 : ::
Acquired DNS2 : ::
dhcp6-iapd-list:
== [ 1 ]
iaid: 1 prefix-hint: ::/56 prefix-hint-plt: 604800 prefix-hint-vlt: 2592000

FortiWiFi-40F-3G4G (ipv6) # end

FortiWiFi-40F-3G4G (wan) # end
FortiWiFi-40F-3G4G (internal) # conf ipv6

FortiWiFi-40F-3G4G (ipv6) # show
config ipv6
set ip6-mode delegated
set ip6-delegated-prefix-iaid 1
set dhcp6-prefix-delegation enable
set ip6-send-adv enable
set ip6-manage-flag enable
set ip6-other-flag enable
set ip6-upstream-interface "wan"
set ip6-subnet 2605:59c8:727a:101::/56
config dhcp6-iapd-list
edit 1
set prefix-hint 2605:59c8:727a:100::/64
next
end
end

FortiWiFi-40F-3G4G (ipv6) # get
ip6-mode : delegated
nd-mode : basic
ip6-address : 2605:59c8:727a:101::/56
ip6-allowaccess :
icmp6-send-redirect : enable
ra-send-mtu : enable
ip6-reachable-time : 0
ip6-retrans-time : 0
ip6-hop-limit : 0
ip6-prefix-mode : dhcp6
ip6-delegated-prefix-iaid: 1
dhcp6-prefix-delegation: enable
delegated-prefix iaid 1 : ::/0
preferred-life-time : 0
valid-life-time : 0
delegated-DNS1 : ::
delegated-DNS2 : ::
delegated-domain :
cli-conn6-status : 3
vrrp-virtual-mac6 : disable
vrip6_link_local : ::
ip6-dns-server-override: enable
Acquired DNS1 : ::
Acquired DNS2 : ::
ip6-send-adv : enable
ip6-manage-flag : enable
ip6-other-flag : enable
ip6-max-interval : 600
ip6-min-interval : 198
ip6-link-mtu : 0
ip6-default-life : 1800
ip6-upstream-interface: wan
ip6-subnet : 2605:59c8:727a:101::/56
ip6-prefix-list:
ip6-delegated-prefix-list:
dhcp6-iapd-list:
== [ 1 ]
iaid: 1 prefix-hint: 2605:59c8:727a:100::/64 prefix-hint-plt: 604800 prefix-hint-vlt: 2592000

FortiWiFi-40F-3G4G (ipv6) # end

FortiWiFi-40F-3G4G (internal) # next
FortiWiFi-40F-3G4G (interface) # edit port3.657

FortiWiFi-40F-3G4G (port3.657) # confi ipv6

FortiWiFi-40F-3G4G (ipv6) # show
config ipv6
set ip6-mode delegated
set ip6-allowaccess ping
set ip6-delegated-prefix-iaid 1
set dhcp6-prefix-delegation enable
set ip6-send-adv enable
set ip6-manage-flag enable
set ip6-other-flag enable
set ip6-upstream-interface "wan"
config dhcp6-iapd-list
edit 1
set prefix-hint 2605:59c8:727a:101::/64
next
end
end

FortiWiFi-40F-3G4G (ipv6) # get
ip6-mode : delegated
nd-mode : basic
ip6-address : 2605:59c8:727a:100::/56
ip6-allowaccess : ping
icmp6-send-redirect : enable
ra-send-mtu : enable
ip6-reachable-time : 0
ip6-retrans-time : 0
ip6-hop-limit : 0
ip6-prefix-mode : dhcp6
ip6-delegated-prefix-iaid: 1
dhcp6-prefix-delegation: enable
delegated-prefix iaid 1 : ::/0
preferred-life-time : 0
valid-life-time : 0
delegated-DNS1 : ::
delegated-DNS2 : ::
delegated-domain :
cli-conn6-status : 3
vrrp-virtual-mac6 : disable
vrip6_link_local : ::
ip6-dns-server-override: enable
Acquired DNS1 : ::
Acquired DNS2 : ::
ip6-send-adv : enable
ip6-manage-flag : enable
ip6-other-flag : enable
ip6-max-interval : 600
ip6-min-interval : 198
ip6-link-mtu : 0
ip6-default-life : 1800
ip6-upstream-interface: wan
ip6-subnet : ::/0
ip6-prefix-list:
ip6-delegated-prefix-list:
dhcp6-iapd-list:
== [ 1 ]
iaid: 1 prefix-hint: 2605:59c8:727a:101::/64 prefix-hint-plt: 604800 prefix-hint-vlt: 2592000

FortiWiFi-40F-3G4G # diagnose ipv6 route list
vf=0 tbl=254 type=02(local) protocol=0(unspec) flag=80200000 prio=0 dst:::1/128 dev=14(root) pmtu=16436
vf=0 tbl=254 type=01(unicast) protocol=2(kernel) flag=004c0000 prio=256 dst:2605:59c8:7240:3411::/64 dev=6(wan) pmtu=1500
vf=0 tbl=254 type=02(local) protocol=0(unspec) flag=00300000 prio=0 dst:2605:59c8:727a:100::/128 dev=14(root) pmtu=16436
vf=0 tbl=254 type=02(local) protocol=0(unspec) flag=80200000 prio=0 dst:2605:59c8:727a:100::/128 dev=14(root) pmtu=16436
vf=0 tbl=254 type=02(local) protocol=0(unspec) flag=80200000 prio=0 dst:2605:59c8:727a:101::/128 dev=14(root) pmtu=16436
vf=0 tbl=254 type=01(unicast) protocol=2(kernel) flag=00000000 prio=256 dst:2605:59c8:727a:100::/56 dev=25(port3.657) pmtu=1500
vf=0 tbl=254 type=01(unicast) protocol=2(kernel) flag=00400000 prio=256 dst:2605:59c8:727a:100::/56 dev=18(internal) pmtu=1500
vf=0 tbl=254 type=02(local) protocol=0(unspec) flag=00300000 prio=0 dst:fe80::/128 dev=14(root) pmtu=16436
vf=0 tbl=254 type=02(local) protocol=0(unspec) flag=00300000 prio=0 dst:fe80::/128 dev=14(root) pmtu=16436
vf=0 tbl=254 type=02(local) protocol=0(unspec) flag=00300000 prio=0 dst:fe80::/128 dev=14(root) pmtu=16436
vf=0 tbl=254 type=02(local) protocol=0(unspec) flag=80200000 prio=0 dst:fe80::2ff:ebff:feec:fd57/128 dev=14(root) pmtu=16436
vf=0 tbl=254 type=02(local) protocol=0(unspec) flag=80200000 prio=0 dst:fe80::eaed:d6ff:fe54:7120/128 dev=14(root) pmtu=16436
vf=0 tbl=254 type=02(local) protocol=0(unspec) flag=80200000 prio=0 dst:fe80::eaed:d6ff:fe54:7124/128 dev=14(root) pmtu=16436
vf=0 tbl=254 type=07(unreachable) protocol=2(kernel) flag=00200000 prio=256 dst:fe80::/64 dev=14(root) pmtu=16436
vf=0 tbl=254 type=01(unicast) protocol=2(kernel) flag=00000000 prio=256 dst:fe80::/64 dev=15(naf.root) pmtu=1500
vf=0 tbl=254 type=01(unicast) protocol=2(kernel) flag=00000000 prio=256 dst:fe80::/64 dev=16(l2t.root) pmtu=1300
vf=0 tbl=254 type=01(unicast) protocol=2(kernel) flag=00000000 prio=256 dst:fe80::/64 dev=17(ssl.root) pmtu=1500
vf=0 tbl=254 type=01(unicast) protocol=2(kernel) flag=00000000 prio=256 dst:fe80::/64 dev=29(VPN_Info) pmtu=1420
vf=0 tbl=254 type=01(unicast) protocol=2(kernel) flag=00000000 prio=256 dst:fe80::/64 dev=18(internal) pmtu=1500
vf=0 tbl=254 type=01(unicast) protocol=2(kernel) flag=00000000 prio=256 dst:fe80::/64 dev=27(lan) pmtu=1500
vf=0 tbl=254 type=01(unicast) protocol=2(kernel) flag=00000000 prio=256 dst:fe80::/64 dev=19(wqt.root) pmtu=1500
vf=0 tbl=254 type=01(unicast) protocol=2(kernel) flag=00000000 prio=256 dst:fe80::/64 dev=23(wqtn.14.guestwi) pmtu=1500
vf=0 tbl=254 type=01(unicast) protocol=2(kernel) flag=00000000 prio=256 dst:fe80::/64 dev=24(wqtn.12.wifi) pmtu=1500
vf=0 tbl=254 type=01(unicast) protocol=2(kernel) flag=00000000 prio=256 dst:fe80::/64 dev=10(a) pmtu=1500
vf=0 tbl=254 type=01(unicast) protocol=2(kernel) flag=00000000 prio=256 dst:fe80::/64 dev=7(lan1) pmtu=1500
vf=0 tbl=254 type=01(unicast) protocol=2(kernel) flag=00000000 prio=256 dst:fe80::/64 dev=8(lan2) pmtu=1500
vf=0 tbl=254 type=01(unicast) protocol=2(kernel) flag=00000000 prio=256 dst:fe80::/64 dev=9(lan3) pmtu=1500
vf=0 tbl=254 type=01(unicast) protocol=2(kernel) flag=00000000 prio=256 dst:fe80::/64 dev=13(modem) pmtu=1500
vf=0 tbl=254 type=01(unicast) protocol=2(kernel) flag=00000000 prio=256 dst:fe80::/64 dev=25(port3.657) pmtu=1500
vf=0 tbl=254 type=01(unicast) protocol=2(kernel) flag=00000000 prio=256 dst:fe80::/64 dev=26(port3.659) pmtu=1500
vf=0 tbl=254 type=01(unicast) protocol=2(kernel) flag=00000000 prio=256 dst:fe80::/64 dev=6(wan) pmtu=1500
vf=0 tbl=254 type=01(unicast) protocol=2(kernel) flag=00000000 prio=256 dst:fe80::/64 dev=28(wwan) pmtu=1500
vf=0 tbl=254 type=01(unicast) protocol=2(kernel) flag=00000000 prio=256 dst:fe80::/64 dev=21(guestwifi) pmtu=1500
vf=0 tbl=254 type=01(unicast) protocol=2(kernel) flag=00000000 prio=256 dst:fe80::/64 dev=20(wifi) pmtu=1500
vf=0 tbl=254 type=01(unicast) protocol=0(unspec) flag=01000200 prio=0 dst:ff02::1:2/128 dev=18(internal) pmtu=1500
vf=0 tbl=254 type=01(unicast) protocol=3(boot) flag=00000000 prio=256 dst:ff00::/8 dev=15(naf.root) pmtu=1500
vf=0 tbl=254 type=01(unicast) protocol=3(boot) flag=00000000 prio=256 dst:ff00::/8 dev=16(l2t.root) pmtu=1300
vf=0 tbl=254 type=01(unicast) protocol=3(boot) flag=00000000 prio=256 dst:ff00::/8 dev=17(ssl.root) pmtu=1500
vf=0 tbl=254 type=01(unicast) protocol=3(boot) flag=00000000 prio=256 dst:ff00::/8 dev=29(VPN_Info) pmtu=1420
vf=0 tbl=254 type=01(unicast) protocol=3(boot) flag=00000000 prio=256 dst:ff00::/8 dev=18(internal) pmtu=1500
vf=0 tbl=254 type=01(unicast) protocol=3(boot) flag=00000000 prio=256 dst:ff00::/8 dev=27(lan) pmtu=1500
vf=0 tbl=254 type=01(unicast) protocol=3(boot) flag=00000000 prio=256 dst:ff00::/8 dev=19(wqt.root) pmtu=1500
vf=0 tbl=254 type=01(unicast) protocol=3(boot) flag=00000000 prio=256 dst:ff00::/8 dev=23(wqtn.14.guestwi) pmtu=1500
vf=0 tbl=254 type=01(unicast) protocol=3(boot) flag=00000000 prio=256 dst:ff00::/8 dev=24(wqtn.12.wifi) pmtu=1500
vf=0 tbl=254 type=01(unicast) protocol=3(boot) flag=00000000 prio=256 dst:ff00::/8 dev=10(a) pmtu=1500
vf=0 tbl=254 type=01(unicast) protocol=3(boot) flag=00000000 prio=256 dst:ff00::/8 dev=7(lan1) pmtu=1500
vf=0 tbl=254 type=01(unicast) protocol=3(boot) flag=00000000 prio=256 dst:ff00::/8 dev=8(lan2) pmtu=1500
vf=0 tbl=254 type=01(unicast) protocol=3(boot) flag=00000000 prio=256 dst:ff00::/8 dev=9(lan3) pmtu=1500
vf=0 tbl=254 type=01(unicast) protocol=3(boot) flag=00000000 prio=256 dst:ff00::/8 dev=13(modem) pmtu=1500
vf=0 tbl=254 type=01(unicast) protocol=3(boot) flag=00000000 prio=256 dst:ff00::/8 dev=25(port3.657) pmtu=1500
vf=0 tbl=254 type=01(unicast) protocol=3(boot) flag=00000000 prio=256 dst:ff00::/8 dev=26(port3.659) pmtu=1500
vf=0 tbl=254 type=01(unicast) protocol=3(boot) flag=00000000 prio=256 dst:ff00::/8 dev=6(wan) pmtu=1500
vf=0 tbl=254 type=01(unicast) protocol=3(boot) flag=00000000 prio=256 dst:ff00::/8 dev=28(wwan) pmtu=1500
vf=0 tbl=254 type=01(unicast) protocol=3(boot) flag=00000000 prio=256 dst:ff00::/8 dev=21(guestwifi) pmtu=1500
vf=0 tbl=254 type=01(unicast) protocol=3(boot) flag=00000000 prio=256 dst:ff00::/8 dev=20(wifi) pmtu=1500
vf=0 tbl=254 type=01(unicast) protocol=2(kernel) flag=00450000 prio=1024 gwy:fe80::200:5eff:fe00:101 dev=6(wan) pmtu=1500
vf=0 tbl=0 type=07(unreachable) protocol=2(kernel) flag=00200000 prio=-1 dev=14(root) pmtu=16436

FortiWiFi-40F-3G4G # diagnose ipv6 address list
dev=6 devname=wan flag=P scope=253 prefix=64 addr=fe80::eaed:d6ff:fe54:7120 preferred=4294967295 valid=4294967295 cstamp=8321 tstamp=8321
dev=14 devname=root flag=P scope=254 prefix=128 addr=::1 preferred=4294967295 valid=4294967295 cstamp=4987 tstamp=4987
dev=18 devname=internal flag= scope=0 prefix=56 addr=2605:59c8:727a:101:: preferred=141 valid=291 cstamp=1526929 tstamp=1585190
dev=18 devname=internal flag=P scope=253 prefix=64 addr=fe80::2ff:ebff:feec:fd57 preferred=4294967295 valid=4294967295 cstamp=7123 tstamp=7123
dev=25 devname=port3.657 flag= scope=0 prefix=56 addr=2605:59c8:727a:100:: preferred=141 valid=291 cstamp=1534933 tstamp=1585190
dev=25 devname=port3.657 flag=P scope=253 prefix=64 addr=fe80::eaed:d6ff:fe54:7124 preferred=4294967295 valid=4294967295 cstamp=1001592 tstamp=1001592
dev=30 devname=vsys_ha flag=P scope=254 prefix=128 addr=::1 preferred=4294967295 valid=4294967295 cstamp=7646 tstamp=7646
dev=32 devname=vsys_fgfm flag=P scope=254 prefix=128 addr=::1 preferred=4294967295 valid=4294967295 cstamp=8324 tstamp=8324

[Stephen_G]

Hello,

Thank you for using the Community Forum. I will seek to get you an answer or help. We will reply to this thread with an update as soon as possible.

Thanks,

[ocastillocoopelessca]

Yes, thank you for your response. That’s exactly what I want to do.

[funkylicious]

hi,

just to make sure that i understand correctly what you are trying to achieve.

do you want this FWF-40F-3G4G to assign ipv6 prefixes from the /56 prefix provided by Starlink to downstream devices connected to it?

[ocastillocoopelessca]

Yes, thank you for your response. That’s exactly what I want to do.

[funkylicious · Accepted solution]

From the guide, i think you missed step 5 configuring the dhcp6 server.

[tatereal]

---

@ocastillocoopelessca wrote:

Hi everyone,

I'm facing an issue that I need help resolving. I'm trying to configure a FortiWiFi 40F to distribute the IPv6 ::/56 prefix provided by my Starlink High Performance connection. I believe you might know how to set this up

I’ve checked some resources(https://docs.fortinet.com/document/fortigate/7.6.2/administration-guide/37673/ipv6-prefix-delegation), but they haven’t helped me successfully propagate IPv6 on the FortiWiFi 40F. I’ll attach the configuration script for your reference.

I really appreciate any assistance you can provide.

Best regards 

Octavio

FortiWiFi-40F-3G4G (interface) # edit wan

FortiWiFi-40F-3G4G (wan) # config ipv6

FortiWiFi-40F-3G4G (ipv6) # show
config ipv6
set ip6-mode dhcp
set ip6-allowaccess ping
set dhcp6-prefix-delegation enable
config dhcp6-iapd-list
edit 1
set prefix-hint ::/56
next
end
end

FortiWiFi-40F-3G4G (ipv6) # get
ip6-mode : dhcp
nd-mode : basic
ip6-address : ::/0
ip6-allowaccess : ping
icmp6-send-redirect : enable
ra-send-mtu : enable
ip6-reachable-time : 0
ip6-retrans-time : 0
ip6-hop-limit : 0
dhcp6-prefix-delegation: enable
delegated-prefix iaid 1 : 2605:59c8:727a:100::/56
preferred-life-time : 150
valid-life-time : 300
delegated-DNS1 : 2606:4700:4700::1111
delegated-DNS2 : 2001:4860:4860::8888
delegated-domain :
cli-conn6-status : 1
vrrp-virtual-mac6 : disable
vrip6_link_local : ::
ip6-dns-server-override: enable
Acquired DNS1 : ::
Acquired DNS2 : ::
dhcp6-iapd-list:
== [ 1 ]
iaid: 1 prefix-hint: ::/56 prefix-hint-plt: 604800 prefix-hint-vlt: 2592000

FortiWiFi-40F-3G4G (ipv6) # end

FortiWiFi-40F-3G4G (wan) # end
FortiWiFi-40F-3G4G (internal) # conf ipv6

FortiWiFi-40F-3G4G (ipv6) # show
config ipv6
set ip6-mode delegated
set ip6-delegated-prefix-iaid 1
set dhcp6-prefix-delegation enable
set ip6-send-adv enable
set ip6-manage-flag enable
set ip6-other-flag enable
set ip6-upstream-interface "wan"
set ip6-subnet 2605:59c8:727a:101::/56
config dhcp6-iapd-list
edit 1
set prefix-hint 2605:59c8:727a:100::/64
next
end
end

FortiWiFi-40F-3G4G (ipv6) # get
ip6-mode : delegated
nd-mode : basic
ip6-address : 2605:59c8:727a:101::/56
ip6-allowaccess :
icmp6-send-redirect : enable
ra-send-mtu : enable
ip6-reachable-time : 0
ip6-retrans-time : 0
ip6-hop-limit : 0
ip6-prefix-mode : dhcp6
ip6-delegated-prefix-iaid: 1
dhcp6-prefix-delegation: enable
delegated-prefix iaid 1 : ::/0
preferred-life-time : 0
valid-life-time : 0
delegated-DNS1 : ::
delegated-DNS2 : ::
delegated-domain :
cli-conn6-status : 3
vrrp-virtual-mac6 : disable
vrip6_link_local : ::
ip6-dns-server-override: enable
Acquired DNS1 : ::
Acquired DNS2 : ::
ip6-send-adv : enable
ip6-manage-flag : enable
ip6-other-flag : enable
ip6-max-interval : 600
ip6-min-interval : 198
ip6-link-mtu : 0
ip6-default-life : 1800
ip6-upstream-interface: wan
ip6-subnet : 2605:59c8:727a:101::/56
ip6-prefix-list:
ip6-delegated-prefix-list:
dhcp6-iapd-list:
== [ 1 ]
iaid: 1 prefix-hint: 2605:59c8:727a:100::/64 prefix-hint-plt: 604800 prefix-hint-vlt: 2592000

FortiWiFi-40F-3G4G (ipv6) # end

FortiWiFi-40F-3G4G (internal) # next
FortiWiFi-40F-3G4G (interface) # edit port3.657

FortiWiFi-40F-3G4G (port3.657) # confi ipv6

FortiWiFi-40F-3G4G (ipv6) # show
config ipv6
set ip6-mode delegated
set ip6-allowaccess ping
set ip6-delegated-prefix-iaid 1
set dhcp6-prefix-delegation enable
set ip6-send-adv enable
set ip6-manage-flag enable
set ip6-other-flag enable
set ip6-upstream-interface "wan"
config dhcp6-iapd-list
edit 1
set prefix-hint 2605:59c8:727a:101::/64
next
end
end

FortiWiFi-40F-3G4G (ipv6) # get
ip6-mode : delegated
nd-mode : basic
ip6-address : 2605:59c8:727a:100::/56
ip6-allowaccess : ping
icmp6-send-redirect : enable
ra-send-mtu : enable
ip6-reachable-time : 0
ip6-retrans-time : 0
ip6-hop-limit : 0
ip6-prefix-mode : dhcp6
ip6-delegated-prefix-iaid: 1
dhcp6-prefix-delegation: enable
delegated-prefix iaid 1 : ::/0
preferred-life-time : 0
valid-life-time : 0
delegated-DNS1 : ::
delegated-DNS2 : ::
delegated-domain :
cli-conn6-status : 3
vrrp-virtual-mac6 : disable
vrip6_link_local : ::
ip6-dns-server-override: enable
Acquired DNS1 : ::
Acquired DNS2 : ::
ip6-send-adv : enable
ip6-manage-flag : enable
ip6-other-flag : enable
ip6-max-interval : 600
ip6-min-interval : 198
ip6-link-mtu : 0
ip6-default-life : 1800
ip6-upstream-interface: wan
ip6-subnet : ::/0
ip6-prefix-list:
ip6-delegated-prefix-list:
dhcp6-iapd-list:
== [ 1 ]
iaid: 1 prefix-hint: 2605:59c8:727a:101::/64 prefix-hint-plt: 604800 prefix-hint-vlt: 2592000

FortiWiFi-40F-3G4G # diagnose ipv6 route list
vf=0 tbl=254 type=02(local) protocol=0(unspec) flag=80200000 prio=0 dst:::1/128 dev=14(root) pmtu=16436
vf=0 tbl=254 type=01(unicast) protocol=2(kernel) flag=004c0000 prio=256 dst:2605:59c8:7240:3411::/64 dev=6(wan) pmtu=1500
vf=0 tbl=254 type=02(local) protocol=0(unspec) flag=00300000 prio=0 dst:2605:59c8:727a:100::/128 dev=14(root) pmtu=16436
vf=0 tbl=254 type=02(local) protocol=0(unspec) flag=80200000 prio=0 dst:2605:59c8:727a:100::/128 dev=14(root) pmtu=16436
vf=0 tbl=254 type=02(local) protocol=0(unspec) flag=80200000 prio=0 dst:2605:59c8:727a:101::/128 dev=14(root) pmtu=16436
vf=0 tbl=254 type=01(unicast) protocol=2(kernel) flag=00000000 prio=256 dst:2605:59c8:727a:100::/56 dev=25(port3.657) pmtu=1500
vf=0 tbl=254 type=01(unicast) protocol=2(kernel) flag=00400000 prio=256 dst:2605:59c8:727a:100::/56 dev=18(internal) pmtu=1500
vf=0 tbl=254 type=02(local) protocol=0(unspec) flag=00300000 prio=0 dst:fe80::/128 dev=14(root) pmtu=16436
vf=0 tbl=254 type=02(local) protocol=0(unspec) flag=00300000 prio=0 dst:fe80::/128 dev=14(root) pmtu=16436
vf=0 tbl=254 type=02(local) protocol=0(unspec) flag=00300000 prio=0 dst:fe80::/128 dev=14(root) pmtu=16436
vf=0 tbl=254 type=02(local) protocol=0(unspec) flag=80200000 prio=0 dst:fe80::2ff:ebff:feec:fd57/128 dev=14(root) pmtu=16436
vf=0 tbl=254 type=02(local) protocol=0(unspec) flag=80200000 prio=0 dst:fe80::eaed:d6ff:fe54:7120/128 dev=14(root) pmtu=16436
vf=0 tbl=254 type=02(local) protocol=0(unspec) flag=80200000 prio=0 dst:fe80::eaed:d6ff:fe54:7124/128 dev=14(root) pmtu=16436
vf=0 tbl=254 type=07(unreachable) protocol=2(kernel) flag=00200000 prio=256 dst:fe80::/64 dev=14(root) pmtu=16436
vf=0 tbl=254 type=01(unicast) protocol=2(kernel) flag=00000000 prio=256 dst:fe80::/64 dev=15(naf.root) pmtu=1500
vf=0 tbl=254 type=01(unicast) protocol=2(kernel) flag=00000000 prio=256 dst:fe80::/64 dev=16(l2t.root) pmtu=1300
vf=0 tbl=254 type=01(unicast) protocol=2(kernel) flag=00000000 prio=256 dst:fe80::/64 dev=17(ssl.root) pmtu=1500
vf=0 tbl=254 type=01(unicast) protocol=2(kernel) flag=00000000 prio=256 dst:fe80::/64 dev=29(VPN_Info) pmtu=1420
vf=0 tbl=254 type=01(unicast) protocol=2(kernel) flag=00000000 prio=256 dst:fe80::/64 dev=18(internal) pmtu=1500
vf=0 tbl=254 type=01(unicast) protocol=2(kernel) flag=00000000 prio=256 dst:fe80::/64 dev=27(lan) pmtu=1500
vf=0 tbl=254 type=01(unicast) protocol=2(kernel) flag=00000000 prio=256 dst:fe80::/64 dev=19(wqt.root) pmtu=1500
vf=0 tbl=254 type=01(unicast) protocol=2(kernel) flag=00000000 prio=256 dst:fe80::/64 dev=23(wqtn.14.guestwi) pmtu=1500
vf=0 tbl=254 type=01(unicast) protocol=2(kernel) flag=00000000 prio=256 dst:fe80::/64 dev=24(wqtn.12.wifi) pmtu=1500
vf=0 tbl=254 type=01(unicast) protocol=2(kernel) flag=00000000 prio=256 dst:fe80::/64 dev=10(a) pmtu=1500
vf=0 tbl=254 type=01(unicast) protocol=2(kernel) flag=00000000 prio=256 dst:fe80::/64 dev=7(lan1) pmtu=1500
vf=0 tbl=254 type=01(unicast) protocol=2(kernel) flag=00000000 prio=256 dst:fe80::/64 dev=8(lan2) pmtu=1500
vf=0 tbl=254 type=01(unicast) protocol=2(kernel) flag=00000000 prio=256 dst:fe80::/64 dev=9(lan3) pmtu=1500
vf=0 tbl=254 type=01(unicast) protocol=2(kernel) flag=00000000 prio=256 dst:fe80::/64 dev=13(modem) pmtu=1500
vf=0 tbl=254 type=01(unicast) protocol=2(kernel) flag=00000000 prio=256 dst:fe80::/64 dev=25(port3.657) pmtu=1500
vf=0 tbl=254 type=01(unicast) protocol=2(kernel) flag=00000000 prio=256 dst:fe80::/64 dev=26(port3.659) pmtu=1500
vf=0 tbl=254 type=01(unicast) protocol=2(kernel) flag=00000000 prio=256 dst:fe80::/64 dev=6(wan) pmtu=1500
vf=0 tbl=254 type=01(unicast) protocol=2(kernel) flag=00000000 prio=256 dst:fe80::/64 dev=28(wwan) pmtu=1500
vf=0 tbl=254 type=01(unicast) protocol=2(kernel) flag=00000000 prio=256 dst:fe80::/64 dev=21(guestwifi) pmtu=1500
vf=0 tbl=254 type=01(unicast) protocol=2(kernel) flag=00000000 prio=256 dst:fe80::/64 dev=20(wifi) pmtu=1500
vf=0 tbl=254 type=01(unicast) protocol=0(unspec) flag=01000200 prio=0 dst:ff02::1:2/128 dev=18(internal) pmtu=1500
vf=0 tbl=254 type=01(unicast) protocol=3(boot) flag=00000000 prio=256 dst:ff00::/8 dev=15(naf.root) pmtu=1500
vf=0 tbl=254 type=01(unicast) protocol=3(boot) flag=00000000 prio=256 dst:ff00::/8 dev=16(l2t.root) pmtu=1300
vf=0 tbl=254 type=01(unicast) protocol=3(boot) flag=00000000 prio=256 dst:ff00::/8 dev=17(ssl.root) pmtu=1500
vf=0 tbl=254 type=01(unicast) protocol=3(boot) flag=00000000 prio=256 dst:ff00::/8 dev=29(VPN_Info) pmtu=1420
vf=0 tbl=254 type=01(unicast) protocol=3(boot) flag=00000000 prio=256 dst:ff00::/8 dev=18(internal) pmtu=1500
vf=0 tbl=254 type=01(unicast) protocol=3(boot) flag=00000000 prio=256 dst:ff00::/8 dev=27(lan) pmtu=1500
vf=0 tbl=254 type=01(unicast) protocol=3(boot) flag=00000000 prio=256 dst:ff00::/8 dev=19(wqt.root) pmtu=1500
vf=0 tbl=254 type=01(unicast) protocol=3(boot) flag=00000000 prio=256 dst:ff00::/8 dev=23(wqtn.14.guestwi) pmtu=1500
vf=0 tbl=254 type=01(unicast) protocol=3(boot) flag=00000000 prio=256 dst:ff00::/8 dev=24(wqtn.12.wifi) pmtu=1500
vf=0 tbl=254 type=01(unicast) protocol=3(boot) flag=00000000 prio=256 dst:ff00::/8 dev=10(a) pmtu=1500
vf=0 tbl=254 type=01(unicast) protocol=3(boot) flag=00000000 prio=256 dst:ff00::/8 dev=7(lan1) pmtu=1500
vf=0 tbl=254 type=01(unicast) protocol=3(boot) flag=00000000 prio=256 dst:ff00::/8 dev=8(lan2) pmtu=1500
vf=0 tbl=254 type=01(unicast) protocol=3(boot) flag=00000000 prio=256 dst:ff00::/8 dev=9(lan3) pmtu=1500
vf=0 tbl=254 type=01(unicast) protocol=3(boot) flag=00000000 prio=256 dst:ff00::/8 dev=13(modem) pmtu=1500
vf=0 tbl=254 type=01(unicast) protocol=3(boot) flag=00000000 prio=256 dst:ff00::/8 dev=25(port3.657) pmtu=1500
vf=0 tbl=254 type=01(unicast) protocol=3(boot) flag=00000000 prio=256 dst:ff00::/8 dev=26(port3.659) pmtu=1500
vf=0 tbl=254 type=01(unicast) protocol=3(boot) flag=00000000 prio=256 dst:ff00::/8 dev=6(wan) pmtu=1500
vf=0 tbl=254 type=01(unicast) protocol=3(boot) flag=00000000 prio=256 dst:ff00::/8 dev=28(wwan) pmtu=1500
vf=0 tbl=254 type=01(unicast) protocol=3(boot) flag=00000000 prio=256 dst:ff00::/8 dev=21(guestwifi) pmtu=1500
vf=0 tbl=254 type=01(unicast) protocol=3(boot) flag=00000000 prio=256 dst:ff00::/8 dev=20(wifi) pmtu=1500
vf=0 tbl=254 type=01(unicast) protocol=2(kernel) flag=00450000 prio=1024 gwy:fe80::200:5eff:fe00:101 dev=6(wan) pmtu=1500
vf=0 tbl=0 type=07(unreachable) protocol=2(kernel) flag=00200000 prio=-1 dev=14(root) pmtu=16436

FortiWiFi-40F-3G4G # diagnose ipv6 address list
dev=6 devname=wan flag=P scope=253 prefix=64 addr=fe80::eaed:d6ff:fe54:7120 preferred=4294967295 valid=4294967295 cstamp=8321 tstamp=8321
dev=14 devname=root flag=P scope=254 prefix=128 addr=::1 preferred=4294967295 valid=4294967295 cstamp=4987 tstamp=4987
dev=18 devname=internal flag= scope=0 prefix=56 addr=2605:59c8:727a:101:: preferred=141 valid=291 cstamp=1526929 tstamp=1585190
dev=18 devname=internal flag=P scope=253 prefix=64 addr=fe80::2ff:ebff:feec:fd57 preferred=4294967295 valid=4294967295 cstamp=7123 tstamp=7123
dev=25 devname=port3.657 flag= scope=0 prefix=56 addr=2605:59c8:727a:100:: preferred=141 valid=291 cstamp=1534933 tstamp=1585190
dev=25 devname=port3.657 flag=P scope=253 prefix=64 addr=fe80::eaed:d6ff:fe54:7124 preferred=4294967295 valid=4294967295 cstamp=1001592 tstamp=1001592
dev=30 devname=vsys_ha flag=P scope=254 prefix=128 addr=::1 preferred=4294967295 valid=4294967295 cstamp=7646 tstamp=7646
dev=32 devname=vsys_fgfm flag=P scope=254 prefix=128 addr=::1 preferred=4294967295 valid=4294967295 cstamp=8324 tstamp=8324

---

Check if your WAN interface is set to dhcp for IPv6 and has prefix delegation enabled. Check if the FortiGate is receiving a valid prefix from Starlink by running get system interface wan. Next, configure your LAN interfaces to use set ip6-mode delegated and assign the received prefix using set ip6-upstream-interface "wan".

Also, enable set ip6-send-adv enable so devices on your network can receive IPv6 addresses. If your prefix shows ::/0, remove and re-add the prefix hint (2605:59c8:727a:101::/56). Finally, verify IPv6 routing with diagnose ipv6 route list to confirm the correct delegation. If the issue persists, reboot the FortiGate and check the settings again.

[tatereal]

I don't get it