Prefix Delegation From address is not a valid IPv6 Netmask …
I have fixed IP & My Service provider granted me a IPv6 which is correctly configured.
The IPv6 is correctly configured & I can ping the outside world
PING6(56=40+8+8 bytes) 2a02:2788:feff:6a::8 –> 2001:4860:4860::8888
16 bytes from 2001:4860:4860::8888, icmp_seq=0 hlim=59 time=18.113 ms
16 bytes from 2001:4860:4860::8888, icmp_seq=1 hlim=59 time=17.897 ms
--- 2001:4860:4860::8888 ping6 statistics ---
2 packets transmitted, 2 packets received, 0.0% packet loss
round-trip min/avg/max/std-dev = 17.897/18.005/18.113/0.108 ms
LAN interface has received the following informations based on ISP proposed :
Prefix delegation Mask : 2a02:2788:feff:1300::/64
LANinterface has therefore been assigned the following IP : 2a02:2788:feff:1300::1
I thought it was time to have my UBUNTU configured in IPv6.
First going on the pfSense
Services –> DHCPv6 Server & RA --> LAN -->DHCPv6 Server
I completed all the informations the best I could as indicate in the attached image but I always received the following :
The following input errors were detected:
Prefix Delegation From address is not a valid IPv6 Netmask for 2a02:2788:feff:1300::/64
Prefix Delegation To address is not a valid IPv6 Netmask for 2a02:2788:feff:1300::/64
I do not understand what I am doing wrong ???
JKnott last edited by
Why are you trying to use a DHCP server? It's normally not needed with IPv6. Using SLAAC, an IPv6 address is automagically created from the prefix and NIC MAC address or a random number. You may have one, the other or both. The random number address will change periodically and you'll have a few deprecated addresses.
Because, it does not find the route …
eth0 Link encap:Ethernet HWaddr 10:c3:7b:50:55:ae
inet addr:192.168.1.5 Bcast:192.168.1.31 Mask:255.255.255.224
inet6 addr: fe80::12c3:7bff:fe50:55ae/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:80227219 errors:0 dropped:0 overruns:0 frame:0
TX packets:134776834 errors:0 dropped:0 overruns:0 carrier:0
RX bytes:25496050173 (25.4 GB) TX bytes:189485686790 (189.4 GB)
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:65536 Metric:1
RX packets:656872 errors:0 dropped:0 overruns:0 frame:0
TX packets:656872 errors:0 dropped:0 overruns:0 carrier:0
RX bytes:67104654 (67.1 MB) TX bytes:67104654 (67.1 MB)
$ traceroute6 2001:4860:4860::8888
connect: Network is unreachable
hda last edited by
Don't do Prefix Delegation Range in your DHCP-config, if you just want a DHCP-server for your LAN (Ubuntu-client).
You probably do not want to delegate a block to the next router ? Anyway a /64 is not correct.
But you do not need an active DHCP-server as indicated. Maybe disable the DHCP-server ?
Then to start with IPv6, first try "Track Interface" on the LAN IPv6 configuration page.
This will hand-out a suitable subnet value in a /64 format, with and from your ISP prefix assignment to your LAN.
Now you can expect RA, a route, the SLAAC method to let the LAN & Ubuntu-box make an IP.
Next from here you could activate and experiment with DHCP6-Server and RA configs.
I think I understand what I did wrong in the DHCP v6 configuration but if I try to do as you suggest, I have the following now :
WAN interface in IP v6 is set to 2a02:2788:feff:006a::8
Gtw for the WAN is 2a02:2788:feff:006a::1 when this is set, I can ping the opendns/google ipv6 hosts (actually I did a traceroute6 to google DNS)!
Now I go to the LAN configuration and choose IPv6 configuration type : Track Interface
I need then to fill the "Track IPv6 interface" but the Drop down box is not filled.
![Screenshot from 2017-01-23 01:49:03.png](/public/imported_attachments/1/Screenshot from 2017-01-23 01:49:03.png)
![Screenshot from 2017-01-23 01:49:03.png_thumb](/public/imported_attachments/1/Screenshot from 2017-01-23 01:49:03.png_thumb)