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DHCPv6 missing clients in IPv6 Lease table

Tomi

Hi,

because I am not able find way how to submit support ticket about UTM9 then I try to ask here.

I have bit weird problem with DHCPv6 server, I set it up and it works properly, clients grab addresses and it works well, problem is with Lease table entries, actually I just testing IPv6 then I set up only 3 clients, all 3 clients get address but in Lease table I see only 2 clients, 3rd client is missing in that table but he have valid address and he periodically renew lease (it is Win10).

I looked also in file dhcpd6.leases and I see that client there but actually it have 2 entries, both active and with some weird looking ia-na.

I already try to stop dhcpv6 server, remove that lease file and start server again but nothing was changed.

With this client I have also another odd problem, if I set preferred-life and max-life to different times this client fail to renew IP at preferred-time and after short time it mark IP as "deprecated", only way is use ipconfig /renew6 or wait until max-life is reached. I looking in win logs and in Dhcp logs and seems client try to renew IP, he get response from dhcp but for unknown reason he ignore that reply. If I set both times to same value everything working well and no more "deprecated" IP.

Have anyone idea what is wrong ?

Thanks for any idea

/Tomi



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  • 0 in reply to Wayne Folta

    that is good point, that 2 clients (visible in lease table) are getting dynamic IP from beginning but that one problematic have at beginning  assigned static IP but later I remove it from Network definitions  to test all clients as dynamic... I removed that static entry for this client from UTM but maybe it is still some hidden record for this client somewhere and still is processed as static ?

    /Tomi

  • 0 in reply to Tomi

    If you are using prefix advertisements, they don't show in the lease table.

    From the documentation:

    Note – Leases that have been granted via prefix advertisements are not shown in the table.

    Is this how your setup is running?

    OPNSense 64-bit | Intel Xeon 4-core v3 1225 3.20Ghz
    16GB Memory | 500GB SSD HDD | ATT Fiber 1GB
    (Former Sophos UTM Veteran, Former XG Rookie)

  • 0 in reply to Amodin

    seems PA have nothing to do with this problem, I turn it off and then try to release6/renew6 on client and I still see same messages in dhcp.log as before and all 3 clients have there same looking messages just only that one not appear in Lease table (all 3 clients getting IP from defined range on dhcp6 server)

    This is from log, this is that "hiding" client (IPs was bit redacted)

    2022:06:30-19:25:02 dhcpd6: Solicit message from fe80::1e1b:dff:fed7:xxxx port 546, transaction ID 0xF37D5200
    2022:06:30-19:25:02 dhcpd6: Advertise NA: address 2001:xxx:xx:xxx::fbaa to client with duid 00:01:00:01:22:20:fd:59:1c:1b:xx:xx:xx:xx iaid = 186391309 valid for 3600 seconds
    2022:06:30-19:25:02 dhcpd6: Sending Advertise to fe80::1e1b:dff:fed7:xxxx port 546
    2022:06:30-19:25:03 dhcpd6: Request message from fe80::1e1b:dff:fed7:xxxx port 546, transaction ID 0xF37D5200
    2022:06:30-19:25:03 dhcpd6: Reply NA: address 2001:xxx:xx:xxx::fbaa to client with duid 00:01:00:01:22:20:fd:59:1c:1b:xx:xx:xx:xx iaid = 186391309 valid for 3600 seconds
    2022:06:30-19:25:03 dhcpd6: Sending Reply to fe80::1e1b:dff:fed7:xxxx port 546

  • 0 in reply to Amodin

    It's not PA, per-se, it's SLAAC, correct? And you should be able to have PA and DHCPv6 both, including having DHCP dynamic, DHCP static, and SLAAC IPs, or DHCP dynamic/static only and no SLAAC. (In theory, not sure what UTM supports.)

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