Netgate Discussion Forum
    • Categories
    • Recent
    • Tags
    • Popular
    • Users
    • Search
    • Register
    • Login

    IPv6 unable to access internet on LAN interface

    Scheduled Pinned Locked Moved IPv6
    25 Posts 5 Posters 3.6k Views
    Loading More Posts
    • Oldest to Newest
    • Newest to Oldest
    • Most Votes
    Reply
    • Reply as topic
    Log in to reply
    This topic has been deleted. Only users with topic management privileges can see it.
    • X
      xayumi
      last edited by

      Yes it works now, but any ideas for how to enable Privacy Extensions (RFC 4941) for SLAAC/DHCPv6 on WAN?

      Since I am using virtual router, i don't wanna expose my mac address or mac vendor, thanks!

      0_1549868299621_768e6fad-bee1-4da5-a50c-fdf9821063c9-image.png

      DerelictD 1 Reply Last reply Reply Quote 0
      • GertjanG
        Gertjan
        last edited by

        I'm trying to stay away from SLAAC.
        I received a routable /64 from he.net, setup the DHCP6 on my LAN's, and stopped looking at it.

        0_1549869199767_804a1b6a-c924-43d0-8def-577f79ffc681-image.png

        No "help me" PM's please. Use the forum, the community will thank you.
        Edit : and where are the logs ??

        1 Reply Last reply Reply Quote 0
        • DerelictD
          Derelict LAYER 8 Netgate @xayumi
          last edited by

          @xayumi Not really.

          IPv6 in pfSense is designed to be used properly.

          What you (Or actually, your ISP) is doing is pretty much nonsense.

          Chattanooga, Tennessee, USA
          A comprehensive network diagram is worth 10,000 words and 15 conference calls.
          DO NOT set a source address/port in a port forward or firewall rule unless you KNOW you need it!
          Do Not Chat For Help! NO_WAN_EGRESS(TM)

          1 Reply Last reply Reply Quote 0
          • JKnottJ
            JKnott @xayumi
            last edited by JKnott

            @xayumi said in IPv6 unable to access internet on LAN interface:

            I called up ISP, they told a /64 address but single IP one and only one is assigned to me (unless i subscribe to other plan with additional $$)

            They only give you 1 IPv6 address???? I get a /64 on my cell phone and a /56 at home. Unbelievable!!!

            Yes it works now, but any ideas for how to enable Privacy Extensions (RFC 4941) for SLAAC/DHCPv6 on WAN?

            You can't do it with only 1 address. With privacy extensions, You'll wind up with 8 addresses after a week.

            PfSense running on Qotom mini PC
            i5 CPU, 4 GB memory, 32 GB SSD & 4 Intel Gb Ethernet ports.
            UniFi AC-Lite access point

            I haven't lost my mind. It's around here...somewhere...

            X 2 Replies Last reply Reply Quote 0
            • X
              xayumi @JKnott
              last edited by

              @gertjan said in IPv6 unable to access internet on LAN interface:

              I received a routable /64 from he.net, setup the DHCP6 on my LAN's, and stopped looking at it.

              That's nice, do you need to run any routing protocol on your WAN or you'd just enable WAN with DHCPv6?

              Thanks !!

              1 Reply Last reply Reply Quote 0
              • X
                xayumi @JKnott
                last edited by xayumi

                @jknott said in IPv6 unable to access internet on LAN interface:

                @xayumi said in IPv6 unable to access internet on LAN interface:

                I called up ISP, they told a /64 address but single IP one and only one is assigned to me (unless i subscribe to other plan with additional $$)

                They only give you 1 IPv6 address???? I get a /64 on my cell phone and a /56 at home. Unbelievable!!!

                Yes it works now, but any ideas for how to enable Privacy Extensions (RFC 4941) for SLAAC/DHCPv6 on WAN?

                You can't do it with only 1 address. With privacy extensions, You'll wind up with 8 addresses after a week.

                Hi JKnottt, yes they give me /64 for my home, and I was unable to create subnet or whatever within my LAN, currently I am using IPv6 NAT like v4 do for my pfsense... @@!!

                Oh got ya ... maybe I will try to generate a random mac address on my VM's wan to hide this info then if it's not possible to do a quick setting in pfsense :)

                1 Reply Last reply Reply Quote 0
                • DerelictD
                  Derelict LAYER 8 Netgate
                  last edited by Derelict

                  If they are assigning a /64 to your WAN you cannot use it on LAN.

                  If they are assigning an IPv6 address on WAN and ROUTING a /64 to that you can use that /64 on LAN.

                  This is not a pfSense problem. It is an ISP problem.

                  Chattanooga, Tennessee, USA
                  A comprehensive network diagram is worth 10,000 words and 15 conference calls.
                  DO NOT set a source address/port in a port forward or firewall rule unless you KNOW you need it!
                  Do Not Chat For Help! NO_WAN_EGRESS(TM)

                  X 1 Reply Last reply Reply Quote 0
                  • X
                    xayumi @Derelict
                    last edited by

                    @derelict

                    Hi yes, I understand, they just assigned me a ipv6 address with mark /64 on my WAN, instead of a ipv6 and /64 subnet to me.

                    I am new to IPv6 just really does spent some hours to figure it out!
                    Thanks for your help! NAT for IPv6 is current a solution for me :)

                    JKnottJ 1 Reply Last reply Reply Quote 0
                    • JKnottJ
                      JKnott @xayumi
                      last edited by

                      @xayumi said in IPv6 unable to access internet on LAN interface:

                      @derelict

                      Hi yes, I understand, they just assigned me a ipv6 address with mark /64 on my WAN, instead of a ipv6 and /64 subnet to me.

                      I am new to IPv6 just really does spent some hours to figure it out!
                      Thanks for your help! NAT for IPv6 is current a solution for me :)

                      One thing a lot of people have to figure out is the WAN address is not used for routing. It's a /128, which means it's to identify an interface only. It cannot be used to communicate with another device, without going through a router (pfSense). On IPv6, link local addresses are normally used for routing. Link local addresses start with fe80.

                      PfSense running on Qotom mini PC
                      i5 CPU, 4 GB memory, 32 GB SSD & 4 Intel Gb Ethernet ports.
                      UniFi AC-Lite access point

                      I haven't lost my mind. It's around here...somewhere...

                      1 Reply Last reply Reply Quote 1
                      • X
                        xayumi
                        last edited by

                        @JKnott yes, JKnott, thanks a lot !!!

                        @Derelict
                        Thanks for your tips !!!
                        Between recently I have enabled the OpenVPN with IPv6 (another subnet) fc01::1/64 and found that the fc::1/64 on LAN side those computers then now unable to route through pfSense but fine via VPN, which is quite strange, both subnet are in NAT rules and policy had enable IPv6

                        Attached is the configuration which i made changes on VPN side, I look through the log but had no ideas yet why the LAN is not able to goes through IPv6 suddenly after enable IPv6 VPN.

                        Below is my configuration for OpenVPN for IPv6.

                        OpenVPN Setting
                        openvpn setting.png

                        Network Policy
                        policy.png

                        NAT
                        nat.png

                        End up in routing issues on LAN IPv6 - With OpenVPN clients, able to run both IPv4 and v6 internet access, but LAN side are not working after enable OpenVPN IPv6 setting.

                        routing issues 1.png

                        1 Reply Last reply Reply Quote 0
                        • DerelictD
                          Derelict LAYER 8 Netgate
                          last edited by

                          Glad it's working.

                          Note: Even though the ULA space is assigned as fc00::/7, only fd00::/8 should be used. And specifically in /48 prefixes.

                          https://en.wikipedia.org/wiki/Unique_local_address#Definition

                          Chattanooga, Tennessee, USA
                          A comprehensive network diagram is worth 10,000 words and 15 conference calls.
                          DO NOT set a source address/port in a port forward or firewall rule unless you KNOW you need it!
                          Do Not Chat For Help! NO_WAN_EGRESS(TM)

                          X JKnottJ 2 Replies Last reply Reply Quote 0
                          • X
                            xayumi @Derelict
                            last edited by

                            @Derelict
                            Great, let me try re-addressing those! and see :)

                            1 Reply Last reply Reply Quote 0
                            • JKnottJ
                              JKnott @Derelict
                              last edited by JKnott

                              @Derelict said in IPv6 unable to access internet on LAN interface:

                              Glad it's working.

                              Note: Even though the ULA space is assigned as fc00::/7, only fd00::/8 should be used. And specifically in /48 prefixes.

                              https://en.wikipedia.org/wiki/Unique_local_address#Definition

                              I thought fd00 was for when you picked your own prefix and fc00 was when you got it from some central server. The idea for the server was to avoid the possibility of a collsion, though it would be hard to collide, when you can choose a random number with 32 bits. I created my prefix by using the command "ps aux|md5sum" on a Linux box and taking enough of it to fill out the prefix.

                              PfSense running on Qotom mini PC
                              i5 CPU, 4 GB memory, 32 GB SSD & 4 Intel Gb Ethernet ports.
                              UniFi AC-Lite access point

                              I haven't lost my mind. It's around here...somewhere...

                              1 Reply Last reply Reply Quote 0
                              • X
                                xayumi
                                last edited by

                                @Derelict Thanks! I do the re-addressing,

                                with OpenVPN as fd00::2:0:0:0:0:1/64
                                With LAN as fd00:0:1::/48, and DHCPv6 with allow PD on fd00:0:1:ffff::/64

                                Now all works finally like a Cham !! Cheers !!

                                @JKnott Thanks for your tips too !!

                                1 Reply Last reply Reply Quote 0
                                • DerelictD
                                  Derelict LAYER 8 Netgate
                                  last edited by Derelict

                                  OK. That is not right either, unfortunately.

                                  You should ALWAYS set an interface network to /64. Always.

                                  You should generate 40 random bits and append them to fd so you have `fd(forty-random-bits)::/48 to use at THAT SITE.

                                  There are 65536 /64 networks to use out of that prefix, 256 /56 prefixes.

                                  For instance, generate a random prefix using a site such as this:

                                  https://cd34.com/rfc4193/

                                  Plug in any MAC address from your network (pretty much guaranteed to be globally-unique) and get the result. That is your /48.

                                  I got this:

                                  Your Private IPv6 network is:
                                  fda9:e2c2:07be::/48
                                  
                                  giving you access to the to the following /64s:
                                  fda9:e2c2:07be:0::/64 through fda9:e2c2:07be:ffff::/64
                                  
                                  This page uses the first method suggested by IETF using the current
                                  timestamp plus the mac address, sha1 hashed, and the lower 40 bits to
                                  generate your random ULA. Consequently, if two organizations hit this page
                                  within the same second, with the same mac address to generate a ULA, they
                                  could have identical ULAs.
                                  

                                  So you use address bits 49-63 from 0 to ffff as the subnet identifier to place on interfaces.

                                  Chattanooga, Tennessee, USA
                                  A comprehensive network diagram is worth 10,000 words and 15 conference calls.
                                  DO NOT set a source address/port in a port forward or firewall rule unless you KNOW you need it!
                                  Do Not Chat For Help! NO_WAN_EGRESS(TM)

                                  JKnottJ 1 Reply Last reply Reply Quote 0
                                  • JKnottJ
                                    JKnott @Derelict
                                    last edited by

                                    @Derelict said in IPv6 unable to access internet on LAN interface:

                                    You should ALWAYS set an interface network to /64. Always.

                                    I read some discussion a while ago, about how that doesn't apply to point to point links, where a /126 or /127 should be used, for security reasons. However, it certainly applies on LANs so that SLAAC can work properly.

                                    PfSense running on Qotom mini PC
                                    i5 CPU, 4 GB memory, 32 GB SSD & 4 Intel Gb Ethernet ports.
                                    UniFi AC-Lite access point

                                    I haven't lost my mind. It's around here...somewhere...

                                    1 Reply Last reply Reply Quote 0
                                    • DerelictD
                                      Derelict LAYER 8 Netgate
                                      last edited by Derelict

                                      We're not talking about point-to-point links, bro.

                                      I don't have time to make every forum response cover every possible caveat.

                                      Chattanooga, Tennessee, USA
                                      A comprehensive network diagram is worth 10,000 words and 15 conference calls.
                                      DO NOT set a source address/port in a port forward or firewall rule unless you KNOW you need it!
                                      Do Not Chat For Help! NO_WAN_EGRESS(TM)

                                      1 Reply Last reply Reply Quote 0
                                      • First post
                                        Last post
                                      Copyright 2025 Rubicon Communications LLC (Netgate). All rights reserved.