@patient0 @pst

I am testing on windows. Only have VM labs on linux; all user computers are windows. And all linux machines have static ip:s.

I actually have two issues. DHCP6 and the router problem.
Switched to use DHCP on the pfsense, and IPv6 leases don't work on KEA at all (it gets permission denied sending message().
Switched to ISC and then the engine issues addresses, but pfsense does it wierdly somehow, from a windows perspective, so windows clients never accept the address, so ISC issues 4 or 5 before giving up, and the client ends up without an address.
It sends them to the fe80 address that requested it, with XID matching that client and the address in the IAA tag.
Instead of sending out addresses directly they are sending it in IAA tag to the questioning link local address. Which windows don't seem to handle. To my unpracticed eye
Tried to run KEA and ISC on Debian, and there DHCP6 works, and ISC on openSuSE works as well.

I can see if I can share some wireshark ss later on using them as DHCP6 server.
But here is a ws screenshot of it from pfSense:

96d09a03-a9e2-45e0-9eb4-e0fb2cf30382-image.png

For alternate gateway monitoring with IPv6, here’s a short overview:

IPv6 routers typically use Router Advertisements RA to announce themselves. Monitoring alternate gateways means checking reachability of these routers. Tools like rdisc6, ndp or radvdump can help observe RA behavior and detect when a router stops responding. For dynamic failover use VRRPv3, HSRP for IPv6 or scripting with Netlink/ICMPv6 listeners to switch default routes when a gateway fails. You can also script ip -6 route adjustments based on ping results or neighbor table states.

@bearhntr

I would presume not, at least not yet.

☕️

@Gertjan Yes I'm running in debug mode

Jul 11 16:29:49 dhcp6c 82560 extracted an existing DUID from /var/db/dhcp6c_duid: 00:01:00:01:2b:8f:81:6a:20:7c:14:a1:bf:06
Jul 11 16:29:49 dhcp6c 82560 failed to open /usr/local/etc/dhcp6cctlkey: No such file or directory
Jul 11 16:29:49 dhcp6c 82560 failed initialize control message authentication
Jul 11 16:29:49 dhcp6c 82560 skip opening control port
Jul 11 16:29:49 dhcp6c 82560 <3>[interface] (9)
Jul 11 16:29:49 dhcp6c 82560 <5>[igb0] (4)
Jul 11 16:29:49 dhcp6c 82560 <3>begin of closure [{] (1)
Jul 11 16:29:49 dhcp6c 82560 <3>[script] (6)
Jul 11 16:29:49 dhcp6c 82560 <3>["/var/etc/dhcp6c_wan_dhcp6withoutra_script.sh"] (46)
Jul 11 16:29:49 dhcp6c 82560 <3>end of sentence [;] (1)
Jul 11 16:29:49 dhcp6c 82560 <3>end of closure [}] (1)
Jul 11 16:29:49 dhcp6c 82560 <3>end of sentence [;] (1)
Jul 11 16:29:49 dhcp6c 82560 <3>[id-assoc] (8)
Jul 11 16:29:49 dhcp6c 82560 <13>[na] (2)
Jul 11 16:29:49 dhcp6c 82560 <13>[1] (1)
Jul 11 16:29:49 dhcp6c 82560 <13>begin of closure [{] (1)
Jul 11 16:29:49 dhcp6c 82560 <3>end of closure [}] (1)
Jul 11 16:29:49 dhcp6c 82560 <3>end of sentence [;] (1)
Jul 11 16:29:49 dhcp6c 82560 called
Jul 11 16:29:49 dhcp6c 82560 some IA configuration defined but not used
Jul 11 16:29:49 dhcp6c 82560 called
Jul 11 16:29:49 dhcp6c 82642 reset a timer on igb0, state=INIT, timeo=0, retrans=891
Jul 11 16:29:49 dhcp6c 82642 Sending Solicit
Jul 11 16:29:49 dhcp6c 82642 a new XID (93ca57) is generated
Jul 11 16:29:49 dhcp6c 82642 set client ID (len 14)
Jul 11 16:29:49 dhcp6c 82642 set elapsed time (len 2)
Jul 11 16:29:49 dhcp6c 82642 send solicit to ff02::1:2%igb0
Jul 11 16:29:49 dhcp6c 82642 reset a timer on igb0, state=SOLICIT, timeo=0, retrans=1091
Jul 11 16:29:49 dhcp6c 82642 receive advertise from fe80::88ce:87ff:fec6:156a%igb0 on igb0
Jul 11 16:29:49 dhcp6c 82642 get DHCP option client ID, len 14
Jul 11 16:29:49 dhcp6c 82642 DUID: 00:01:00:01:2b:8f:81:6a:20:7c:14:a1:bf:06
Jul 11 16:29:49 dhcp6c 82642 get DHCP option server ID, len 14
Jul 11 16:29:49 dhcp6c 82642 DUID: 00:01:00:01:21:56:39:cc:fa:32:37:34:e3:9f
Jul 11 16:29:49 dhcp6c 82642 get DHCP option identity association, len 40
Jul 11 16:29:49 dhcp6c 82642 IA_NA: ID=1, T1=1000, T2=2000
Jul 11 16:29:49 dhcp6c 82642 get DHCP option IA address, len 24
Jul 11 16:29:49 dhcp6c 82642 IA_NA address: 2a06:4000:8888:ffff::2 pltime=3000 vltime=4000
Jul 11 16:29:49 dhcp6c 82642 get DHCP option DNS, len 32
Jul 11 16:29:49 dhcp6c 82642 get DHCP option IA_PD, len 41
Jul 11 16:29:49 dhcp6c 82642 IA_PD: ID=1, T1=1000, T2=2000
Jul 11 16:29:49 dhcp6c 82642 get DHCP option IA_PD prefix, len 25
Jul 11 16:29:49 dhcp6c 82642 IA_PD prefix: 2a06:4000:8888::/48 pltime=3000 vltime=1546855634413031328
Jul 11 16:29:49 dhcp6c 82642 server ID: 00:01:00:01:21:56:39:cc:fa:32:37:34:e3:9f, pref=-1
Jul 11 16:29:49 dhcp6c 82642 reset timer for igb0 to 0.958394
Jul 11 16:29:49 dhcp6c 82642 receive advertise from fe80::88ce:87ff:fec6:156a%igb0 on igb0
Jul 11 16:29:49 dhcp6c 82642 get DHCP option client ID, len 14
Jul 11 16:29:49 dhcp6c 82642 DUID: 00:01:00:01:2b:8f:81:6a:20:7c:14:a1:bf:06
Jul 11 16:29:49 dhcp6c 82642 get DHCP option server ID, len 14
Jul 11 16:29:49 dhcp6c 82642 DUID: 00:01:00:01:21:5a:37:e1:96:96:78:4c:ae:6d
Jul 11 16:29:49 dhcp6c 82642 get DHCP option identity association, len 40
Jul 11 16:29:49 dhcp6c 82642 IA_NA: ID=1, T1=1000, T2=2000
Jul 11 16:29:49 dhcp6c 82642 get DHCP option IA address, len 24
Jul 11 16:29:49 dhcp6c 82642 IA_NA address: 2a06:4000:8888:ffff::2 pltime=3000 vltime=4000
Jul 11 16:29:49 dhcp6c 82642 get DHCP option DNS, len 32
Jul 11 16:29:49 dhcp6c 82642 get DHCP option IA_PD, len 41
Jul 11 16:29:49 dhcp6c 82642 IA_PD: ID=1, T1=1000, T2=2000
Jul 11 16:29:49 dhcp6c 82642 get DHCP option IA_PD prefix, len 25
Jul 11 16:29:49 dhcp6c 82642 IA_PD prefix: 2a06:4000:8888::/48 pltime=3000 vltime=1546855634413031328
Jul 11 16:29:49 dhcp6c 82642 server ID: 00:01:00:01:21:5a:37:e1:96:96:78:4c:ae:6d, pref=-1
Jul 11 16:29:50 dhcp6c 82642 picked a server (ID: 00:01:00:01:21:56:39:cc:fa:32:37:34:e3:9f)
Jul 11 16:29:50 dhcp6c 82642 Sending Request
Jul 11 16:29:50 dhcp6c 82642 a new XID (61396e) is generated
Jul 11 16:29:50 dhcp6c 82642 set client ID (len 14)
Jul 11 16:29:50 dhcp6c 82642 set server ID (len 14)
Jul 11 16:29:50 dhcp6c 82642 set elapsed time (len 2)
Jul 11 16:29:50 dhcp6c 82642 send request to ff02::1:2%igb0
Jul 11 16:29:50 dhcp6c 82642 reset a timer on igb0, state=REQUEST, timeo=0, retrans=909
Jul 11 16:29:50 dhcp6c 82642 receive reply from fe80::88ce:87ff:fec6:156a%igb0 on igb0
Jul 11 16:29:50 dhcp6c 82642 get DHCP option client ID, len 14
Jul 11 16:29:50 dhcp6c 82642 DUID: 00:01:00:01:2b:8f:81:6a:20:7c:14:a1:bf:06
Jul 11 16:29:50 dhcp6c 82642 get DHCP option server ID, len 14
Jul 11 16:29:50 dhcp6c 82642 DUID: 00:01:00:01:21:56:39:cc:fa:32:37:34:e3:9f
Jul 11 16:29:50 dhcp6c 82642 get DHCP option identity association, len 40
Jul 11 16:29:50 dhcp6c 82642 IA_NA: ID=1, T1=1000, T2=2000
Jul 11 16:29:50 dhcp6c 82642 get DHCP option IA address, len 24
Jul 11 16:29:50 dhcp6c 82642 IA_NA address: 2a06:4000:8888:ffff::2 pltime=3000 vltime=4000
Jul 11 16:29:50 dhcp6c 82642 get DHCP option DNS, len 32
Jul 11 16:29:50 dhcp6c 82642 get DHCP option IA_PD, len 41
Jul 11 16:29:50 dhcp6c 82642 IA_PD: ID=1, T1=1000, T2=2000
Jul 11 16:29:50 dhcp6c 82642 get DHCP option IA_PD prefix, len 25
Jul 11 16:29:50 dhcp6c 82642 IA_PD prefix: 2a06:4000:8888::/48 pltime=3000 vltime=1546855634413031328
Jul 11 16:29:50 dhcp6c 82642 dhcp6c Received REQUEST
Jul 11 16:29:50 dhcp6c 82642 nameserver[0] 2a06:4000:0:6::6
Jul 11 16:29:50 dhcp6c 82642 nameserver[1] 2a06:4000:0:6::5
Jul 11 16:29:50 dhcp6c 82642 executes /var/etc/dhcp6c_wan_dhcp6withoutra_script.sh
Jul 11 16:29:50 dhcp6c 36281 dhcp6c REQUEST on igb0 - running rtsold
Jul 11 16:29:50 dhcp6c 82642 script "/var/etc/dhcp6c_wan_dhcp6withoutra_script.sh" terminated
Jul 11 16:29:50 dhcp6c 82642 removing an event on igb0, state=REQUEST
Jul 11 16:29:50 dhcp6c 82642 removing server (ID: 00:01:00:01:21:56:39:cc:fa:32:37:34:e3:9f)
Jul 11 16:29:50 dhcp6c 82642 removing server (ID: 00:01:00:01:21:5a:37:e1:96:96:78:4c:ae:6d)
Jul 11 16:29:50 dhcp6c 82642 got an expected reply, sleeping.

@Gertjan plus I have that authenticated ntp patch on that file also

@Gertjan Fixed it. I had on the interface address both an IPv6 address and an "IPv4 address embedded in the IPv6 address (this is known as IPv6-mapped IPv4 addresses or IPv6 embedded IPv4 addresses)" before that is normally not for interfaces only the static device assignments so that is corrected my Pv6-mapped IPv4 addresses or IPv6 embedded IPv4 addresses are now only on the Lan devices and not on the firewall interfaces.

Screenshot 2025-07-09 at 15.29.37.png

I ran this command after upgrading from 2.7.2 to 2.8.0, as I started experiencing significant issues with my work VPN connection behind the firewall. Upon checking the connection properties, I noticed that the VPN was attempting to connect through an IPv6 gateway.

What’s particularly strange is that while the VPN would eventually connect, it often required multiple connection attempts before any traffic would actually pass through.

I’m hoping this fix resolves the issue moving forward—fingers crossed for the next time I need to connect.

@koyaan134 And just to be clear - as soon as I take a look at it again, it's back up.

@crazypotato142 said in [solved] WAN gets IPv6 but LAN can't:

Wouldn't that mean it has the connectivity and with a prefix translation I could use IPv6? Like Teredo or HE.

Imho : don't invest any time in using Toredo. That's a dying concept.
HE (tunnel broker) is something else. I've been using it for years, as they implement a clean and close to perfect, one of the best IPv6 implementations. Their services are not free ! That is, it won't cost you any money, and they even send you a free (yes) T-Shirt when you finish their IPv6 certification process. It's back to school-time-again, and do their multiple choice exam.
They offer a /64 to start with, but don't bother, go for the whopping /48 right way 65535 prefixes.
Your WAN will have a IPv6 GUA.
Downsides :
The POP needs to be close to you.
The connection can be interpreted by the site you visit as some sort of VPN connection (there is a work around available if you use pfBlockerng).
The POPs can be crowed, so the speed won't be stellar.

@johnpoz
Dear John As I suspected, the error was with the provider, after my request they solved the IPv6 problem. I am very grateful to you for your support.

@GeorgePatches

See the images below, maybe this can help. You could give it a try.

2fb49e34-f096-4f24-af9e-6ac1e6487cf5-image.png

2fe0db2f-1676-45bf-8182-717173a8742c-image.png

Thanks!

Raj

Unfortunately this issue still persists in pfsense 2.8.0. At least most European isps still hand out dynamic ipv6 prefixes to their customers which leads to the described issues with slaac.

Refer to: https://redmine.pfsense.org/issues/15746

@Superfletch I did using outbound NAT6, but I since switched to openwrt and no longer use pfSense

@GeorgePatches said in Applying a rule to a single client in a SLAAC only network?:

This won't solve the problem if the ISP rotates your prefix delegation on the regular (my personal experience with Verizon FIOS residential).

Very true.
If any of my LAN devices asks for DHCPv6 lease it will last, on a typical WIN11, 6 hours.
That is, that is what I see :

81557cd4-196e-4b55-adce-9077422a7604-image.png

and now it's 09h44, and I just renew the lease manually with ipconfig /renew6.

If, moment later, my upstream ISP allocated me a new prefix, the DHCP6 LAN server will get restarted with the new prefix ... but my LAN devices still use their now depreciated old prefix.
I'm not sure if other IPv6 magic exists that can warn the LAN device that 'something' has changed, and that it should force renew it's IPv6 lease.
If not, then yeah, now we have a routing issue.

Yes, a prefix can change, but shouldn't change "often". And that is an RFC standard.
For example, since my pfSense is activate on my now IPv6 ISP router, about 18 months now, my prefix didn't change.
France - country where I live - they managed to create a 'law' (privacy act stuff whatever) that an "IP" should at least change ones a year. As I have a 'pro' account, I opted out for that, so my WAN IPv4 and IPv6 (prefix) are pretty rock solid.

Constantly changes prefixes, imho, is a pure pain.
The real issue is : the (IPv6) RFCs exists. And every ISP out there interprets them somewhat differently.

@GeorgePatches said in Applying a rule to a single client in a SLAAC only network?:

The only solution to this problem that I've come up with is to setup dynamic DNS on the client I want to make a rule for, create an alias for said DDNS entry, and then use said alias in a firewall rule.

That is exactly what I do 😊
But I'm not using the classic "Services > Dynamic DNS > Dynamic DNS Clients" solution.
A DHCPv4 and DHCPv6 server can register the host name of a device that asked for a lease into a DNS server.
This already is/was possible with pfSense before, but then the host name is only known locally.
The DHCP ISC server (and kea also) can also use any other DNS server, so also my domain name server) to register the host name with the IP. That's not 'like' DDNS, it IS DDNS, and it also uses RFC2136 (which is a classic, very first DDNS method that existed out there).

As I'm using kea, and kea uses a separate process (program) for that, and pfSense has that program but isn't using it, I decide to use it.
Works great - an was pretty straight forward to implement.
And none of all this is a surprise as kea is written by the same guys who wrote "ISC DHCP", so they made it compatible.

Btw : not that I really need a LAN IPv6 (my NAS) so it can be accessed on a world Internet level, it just enables me to access my NAS over IPv4 or IPv6 anytime. It's more a "to be ready for the future" thing. And the future is here : 60+ % of all my pfSense LAN/WAN traffic is IPv6.

@CNLiberal I have never set up a DHCPv6-PD server, so I can't help with that.

@BigTulsa said in pfSense 2.7.2CE not working when trying to assign multiple interfaces:

I'm wondering if allowing the ia-na 0 is causing the problem here or if I should comment that out from the script. I will likely try it here shortly, but I wanted to jump in here to see if anyone has tried this?

Only one way to be sure :
packet capture the DHCPv6 traffic (dhcp6c and other) and see what 'you' send out and what your ISP box or DHCP4v6 send back as a result.

Be ware :of the reality : IPv4, after 5 decades or so, has reached the 'stable' situation and works pretty well.
IPv6 is another thing. There are the official IPv6 RFC's, and the joke of the century : every ISP interprets them 'differently'. So what works for me - doesn't work for you.
When dealing with IPv6, mention who is your ISP - what equipment you use on the other side of the pfSense WAN port.

Example, my ISP has a pretty good IPv6 support.
I get a IPv6 for my pfSense WAN, and a prefix for my LAN.
Here it comes : just one prefix, even if my pfSense wants more. So I can equip just one LAN with IPv6.
I use the pro version of the ISP Internet access of course. But my ISP (Orange, France) isn't aware of the fact that a company can use more the one LAN ..... (no joke 😕 )

My WAN DHCP6 settings :

1d91937c-1bd6-43fa-ba83-c658d10a97f2-image.png

If I change the /64 for 'something else' everything breaks.

edit : and my ISP box tells me :

f3a34e57-10b7-4aff-9d5e-0a0767aa7060-image.png

so it tells me that it has a /56 or 256 x /64 avaible ....

@BigTulsa said in pfSense 2.7.2CE not working when trying to assign multiple interfaces:

version of pfSense (2.7.2CE).

Hummm.
Your using bleeding edge technology = IPv6 prefixes for your pfSense LANs : what about using the bleeding edge solution : upgrade to 2.8.0 beta right away.
It works ...