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    Ipv6 dhcp

    IPv6
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    • P
      pox last edited by

      i'd like to make my internal lan ipv6 ready.
      i set up my lan interface with a static ipv6 fdf5:4d23:bbbb:92fe:0:0:0:1/96 and now i would like to configure the dhcpv6 server.
      to do that i set the range of the dhcpv6 server to fdf5:4d23:bbbb:92fe:0:0:0:f000 - fdf5:4d23:bbbb:92fe:0:0:0:ffff and when i set a static mapping of a host to fdf5:4d23:bbbb:92fe:0:0:0:4 it works nicely.

      but if i would like to give a host more that one ip, and therefore set the IPv6 address field of the static mapping to fdf5:4d23:bbbb:92fe:0:0:4:0/112, the dhcpv6 server seems to stop responding to dhcp client requests.

      am i doing something wrong?

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      • N
        nfr last edited by

        Your address range is to small. You need at least a /64 to allow auto addres. Read RFC 4291 at https://www.ietf.org/rfc/rfc4291.txt .

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        • JKnott
          JKnott last edited by

          Why do you want to use DHCP?  SLAAC works fine.

          PfSense running on Qotom mini PC
          i5 CPU, 4 GB memory, 64 GB SSD & 4 Intel Gb Ethernet ports.
          UniFi AC-Lite access point

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

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          • P
            pox last edited by

            @JKnott:

            Why do you want to use DHCP?  SLAAC works fine.

            Can I give a fixed ip range to different devices with SLAAC?
            I need to go read some docs on SLAAC.

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            • Derelict
              Derelict LAYER 8 Netgate last edited by

              Can I give a fixed ip range to different devices with SLAAC?

              No.

              Chattanooga, Tennessee, USA
              The pfSense Book is free of charge!
              DO NOT set a source port in a port forward or firewall rule unless you KNOW you need it!
              Do Not Chat For Help! NO_WAN_EGRESS(TM)

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              • P
                pox last edited by

                @Derelict:

                Can I give a fixed ip range to different devices with SLAAC?

                No.

                Ok, back to dhcp then. I will try to increase the address range and see if I can hand out a /112 to each host

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                • Derelict
                  Derelict LAYER 8 Netgate last edited by

                  That is not how it works.

                  Get a tunnel from www.tunnelbroker.net and a /48 and do it right.

                  Chattanooga, Tennessee, USA
                  The pfSense Book is free of charge!
                  DO NOT set a source port in a port forward or firewall rule unless you KNOW you need it!
                  Do Not Chat For Help! NO_WAN_EGRESS(TM)

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                  • JKnott
                    JKnott last edited by

                    @Derelict:

                    Can I give a fixed ip range to different devices with SLAAC?

                    No.

                    Actually, you can.  Just assign a MAC address to whatever you want and the MAC based SLAAC will follow.

                    PfSense running on Qotom mini PC
                    i5 CPU, 4 GB memory, 64 GB SSD & 4 Intel Gb Ethernet ports.
                    UniFi AC-Lite access point

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

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                    • JKnott
                      JKnott last edited by

                      @pox:

                      @Derelict:

                      Can I give a fixed ip range to different devices with SLAAC?

                      No.

                      Ok, back to dhcp then. I will try to increase the address range and see if I can hand out a /112 to each host

                      Why a /112?  Normally, a network has a /64.  If all you want to do is experiment and don't need Internet access, you can use Unique Local Addresses. This provides a /48 that you can play with all you want.  If you do need Internet access, then you can use a tunnel, as suggested above, if your ISP doesn't provide IPv6.

                      PfSense running on Qotom mini PC
                      i5 CPU, 4 GB memory, 64 GB SSD & 4 Intel Gb Ethernet ports.
                      UniFi AC-Lite access point

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

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                      • Derelict
                        Derelict LAYER 8 Netgate last edited by

                        @JKnott:

                        @Derelict:

                        Can I give a fixed ip range to different devices with SLAAC?

                        No.

                        Actually, you can.  Just assign a MAC address to whatever you want and the MAC based SLAAC will follow.

                        That is capital-U Ugly.

                        Chattanooga, Tennessee, USA
                        The pfSense Book is free of charge!
                        DO NOT set a source 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
                        • JKnott
                          JKnott last edited by

                          @Derelict:

                          @JKnott:

                          @Derelict:

                          Can I give a fixed ip range to different devices with SLAAC?

                          No.

                          Actually, you can.  Just assign a MAC address to whatever you want and the MAC based SLAAC will follow.

                          That is capital-U Ugly.

                          Perhaps, but I'm more interested in why DHCP is required.  I get the impression from the posts that the OP isn't quite sure about what he's doing.  With the /112 prefixes, he's doing something even more "ugly".  If he wants multiple networks, then he should get a decent size prefix from an ISP or tunnel, or use ULA to create his own /48.

                          One thing I've noticed is a lot of people are stuck in the IPv4 mindset, where addresses are scarce.  They have a problem considering how that problem doesn't exist with IPv6.

                          PfSense running on Qotom mini PC
                          i5 CPU, 4 GB memory, 64 GB SSD & 4 Intel Gb Ethernet ports.
                          UniFi AC-Lite access point

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

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                          • P
                            pox last edited by

                            @JKnott:

                            @pox:

                            @Derelict:

                            Can I give a fixed ip range to different devices with SLAAC?

                            No.

                            Ok, back to dhcp then. I will try to increase the address range and see if I can hand out a /112 to each host

                            Why a /112?  Normally, a network has a /64.

                            That's for a host, not a network. I would like to give one host 65536 addresses via dhcp (or any other centrally managed way would be ok too).
                            Or am I missing something obvious here?

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                            • P
                              pox last edited by

                              @JKnott:

                              @Derelict:

                              @JKnott:

                              @Derelict:

                              Can I give a fixed ip range to different devices with SLAAC?

                              No.

                              Actually, you can.  Just assign a MAC address to whatever you want and the MAC based SLAAC will follow.

                              That is capital-U Ugly.

                              Perhaps, but I'm more interested in why DHCP is required.  I get the impression from the posts that the OP isn't quite sure about what he's doing.  With the /112 prefixes, he's doing something even more "ugly".  If he wants multiple networks, then he should get a decent size prefix from an ISP or tunnel, or use ULA to create his own /48.

                              One thing I've noticed is a lot of people are stuck in the IPv4 mindset, where addresses are scarce.  They have a problem considering how that problem doesn't exist with IPv6.

                              You are right that I am not sure of what I am doing :) I am playing with ipv6 and trying to understand how the pieces fit together.

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                              • Derelict
                                Derelict LAYER 8 Netgate last edited by

                                What I tell people is to stop thinking about the 64 host bits entirely. To you they don't exist.

                                If you get a /48 you can assign 65536 /64 networks out of it. If you have a /56, 256 networks. A /60, 16. The 64 host bits simply do not exist.

                                Work in /64s. Save the subnetting longer than that for when you know you need it and can say why.

                                Chattanooga, Tennessee, USA
                                The pfSense Book is free of charge!
                                DO NOT set a source port in a port forward or firewall rule unless you KNOW you need it!
                                Do Not Chat For Help! NO_WAN_EGRESS(TM)

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                                • P
                                  pox last edited by

                                  @Derelict:

                                  If you want a host with 65536 addresses on it (good luck with that), just route a /64 to it.

                                  While you might be able to coerce DHCP6 to do a /112 prefix delegation, why would you?

                                  Or just pick a /112 range out of the /64 on the interface and assign them statically.

                                  IPv6 doesn't do much to allow more hosts in one broadcast domain. 64K addresses is still not going to work very well if at all.

                                  Maybe if you disclose what you are trying to do a better solution can be devised.

                                  Sure: i have my internal lan with some servers. On one server, say hostname fritz, I have an ssh server, an http server that hosts 3 websites and an imap server.
                                  I would like to publish all those services on the LAN with their own ip. So say
                                  ssh server fdf5:4d23:aaaa:bbbb:0:0:0:1:22
                                  website 1: fdf5:4d23:aaaa:bbbb:0:0:0:2:80 + 443
                                  website 2: fdf5:4d23:aaaa:bbbb:0:0:0:3:80 + 443
                                  website 3: fdf5:4d23:aaaa:bbbb:0:0:0:4:80 + 443
                                  imap server: fdf5:4d23:aaaa:bbbb:0:0:0:5:993

                                  How should I do that? Is there a best practice? Hardcoding the addresses on the host fritz does not seem right to me, because if someone else on the lan uses the same addresses I have a conflict.
                                  I thought I could use the dhcpv6 to assign host fritz a /112, so host fritz knows he can use those addresses however he pleases, without having to worry of using someone else's addresses.
                                  Is my reasoning wrong? Should I just hardcode the addresses on the server and be done with it?

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                                  • Derelict
                                    Derelict LAYER 8 Netgate last edited by

                                    I would. Otherwise you have to worry about the addresses changing and updating DNS for all your hosts.

                                    If you want to run servers you have to manage IP addresses. IPv6 doesn't change that.

                                    Chattanooga, Tennessee, USA
                                    The pfSense Book is free of charge!
                                    DO NOT set a source 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
                                    • JKnott
                                      JKnott last edited by

                                      That's for a host, not a network. I would like to give one host 65536 addresses via dhcp (or any other centrally managed way would be ok too).
                                      Or am I missing something obvious here?

                                      Yes.  While IPv6 supports multiple IPs on an interface (mine currently has 17) I suspect 65K is a bit much.  If you're running virtual machines for those servers, they will get there own individual addresses, if configured to bridge.

                                      PfSense running on Qotom mini PC
                                      i5 CPU, 4 GB memory, 64 GB SSD & 4 Intel Gb Ethernet ports.
                                      UniFi AC-Lite access point

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

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