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<span style="font-size:8.5pt; font-family:Arial; color:#000000; font-weight:400; white-space:pre-wrap">Hi Anton,</span></p>
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<span style="font-size:8.5pt; font-family:Arial; color:#000000; font-weight:400; white-space:pre-wrap">   Have you considered dropping the DHCPRELEASE packets instead?</span></p>
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<span style="font-size:8.5pt; font-family:Arial; color:#000000; font-weight:400; white-space:pre-wrap">You can read how this could be done in Gitlab #606 "Drop packets in DROP class" at https://gitlab.isc.org/isc-projects/kea/-/issues/606</span></p>
<br>
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<span style="font-size:8.5pt; font-family:Arial; color:#000000; font-weight:400; white-space:pre-wrap">Please refer to the Kea Arm for a discussion on the "DROP" class.</span></p>
<br>
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<span style="font-size:8.5pt; font-family:Arial; color:#000000; font-weight:400; white-space:pre-wrap">Kind Regards Peter</span></p>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Kea-users <kea-users-bounces@lists.isc.org> on behalf of Anton Starikov <starikov.a@tecomgroup.ru><br>
<b>Sent:</b> 18 October 2020 19:02<br>
<b>To:</b> kea-users@lists.isc.org <kea-users@lists.isc.org><br>
<b>Subject:</b> [Kea-users] New IP address after each reboot</font>
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<p class="x_MsoNormal"><span lang="EN-US">Good afternoon! </span></p>
<p class="x_MsoNormal"><span lang="EN-US">Sorry for my english.</span></p>
<p class="x_MsoNormal"><span lang="EN-US"> </span></p>
<p class="x_MsoNormal"><span lang="EN-US">There is a problem with Kea Dhcp4 1.6.3 (1.8 is the same).</span></p>
<p class="x_MsoNormal"><span lang="EN-US">After each reboot, the client (Ubuntu, Arch) gets a new ip address from KeaDhcp. As I understand it, this is due to the fact that Kea, after receiving DHCPRELEASE from the client, does not immediately release the address
 (although it adds a line with expire = 0 to the lease-database), but does it after a while.</span></p>
<p class="x_MsoNormal"><span lang="EN-US">As an experiment, I limited the address pool to two ip. And with each reboot (interval ~ 20 seconds), the client received different addresses in a circle.</span></p>
<p class="x_MsoNormal"><span lang="EN-US">Previously, Mikrotik was used as DHCP, there was no such problem. The client rebooted and, if the address was still free, he received it back.</span></p>
<p class="x_MsoNormal"><span lang="EN-US">Is there any way to force Kea to immediately release such addresses?</span></p>
<p class="x_MsoNormal"><span lang="EN-US"> </span></p>
<p class="x_MsoNormal"><span lang="EN-US">I tried to change the settings described in the documentation in section "10.
</span>Lease Expiration", it didn't help.</p>
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<p class="x_MsoNormal"><span lang="EN-US">            "space": "dhcp4"</span></p>
<p class="x_MsoNormal"><span lang="EN-US">          },</span></p>
<p class="x_MsoNormal"><span lang="EN-US">          {</span></p>
<p class="x_MsoNormal"><span lang="EN-US">            "always-send": false,</span></p>
<p class="x_MsoNormal"><span lang="EN-US">            "code": 67,</span></p>
<p class="x_MsoNormal"><span lang="EN-US">            "csv-format": true,</span></p>
<p class="x_MsoNormal"><span lang="EN-US">            "data": "grldr",</span></p>
<p class="x_MsoNormal"><span lang="EN-US">            "name": "boot-file-name",</span></p>
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<p class="x_MsoNormal"><span lang="EN-US">        "next-server": "10.0.0.10",</span></p>
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<p class="x_MsoNormal"><span lang="EN-US">            "code": 66,</span></p>
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<p class="x_MsoNormal"><span lang="EN-US">            "name": "tftp-server-name",</span></p>
<p class="x_MsoNormal"><span lang="EN-US">            "space": "dhcp4"</span></p>
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<p class="x_MsoNormal"><span lang="EN-US">            "code": 67,</span></p>
<p class="x_MsoNormal"><span lang="EN-US">            "csv-format": true,</span></p>
<p class="x_MsoNormal"><span lang="EN-US">            "data": "grldr1",</span></p>
<p class="x_MsoNormal"><span lang="EN-US">            "name": "boot-file-name",</span></p>
<p class="x_MsoNormal"><span lang="EN-US">            "space": "dhcp4"</span></p>
<p class="x_MsoNormal"><span lang="EN-US">          }</span></p>
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<p class="x_MsoNormal"><span lang="EN-US">    ],</span></p>
<p class="x_MsoNormal"><span lang="EN-US">    "control-socket": {</span></p>
<p class="x_MsoNormal"><span lang="EN-US">      "socket-name": "/tmp/kea-dhcp4-ctrl.sock",</span></p>
<p class="x_MsoNormal"><span lang="EN-US">      "socket-type": "unix"</span></p>
<p class="x_MsoNormal"><span lang="EN-US">    },</span></p>
<p class="x_MsoNormal"><span lang="EN-US">    "decline-probation-period": 86400,</span></p>
<p class="x_MsoNormal"><span lang="EN-US">    "dhcp-ddns": {</span></p>
<p class="x_MsoNormal"><span lang="EN-US">      "enable-updates": false,</span></p>
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<p class="x_MsoNormal"><span lang="EN-US">      "max-reclaim-leases": 100,</span></p>
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<p class="x_MsoNormal"><span lang="EN-US">      {</span></p>
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<p class="x_MsoNormal"><span lang="EN-US">        "code": 6,</span></p>
<p class="x_MsoNormal"><span lang="EN-US">        "csv-format": true,</span></p>
<p class="x_MsoNormal"><span lang="EN-US">        "data": "10.0.0.1",</span></p>
<p class="x_MsoNormal"><span lang="EN-US">        "name": "domain-name-servers",</span></p>
<p class="x_MsoNormal"><span lang="EN-US">        "space": "dhcp4"</span></p>
<p class="x_MsoNormal"><span lang="EN-US">      },</span></p>
<p class="x_MsoNormal"><span lang="EN-US">      {</span></p>
<p class="x_MsoNormal"><span lang="EN-US">        "always-send": false,</span></p>
<p class="x_MsoNormal"><span lang="EN-US">        "code": 15,</span></p>
<p class="x_MsoNormal"><span lang="EN-US">        "csv-format": true,</span></p>
<p class="x_MsoNormal"><span lang="EN-US">        "data": "lab.winitlab.com",</span></p>
<p class="x_MsoNormal"><span lang="EN-US">        "name": "domain-name",</span></p>
<p class="x_MsoNormal"><span lang="EN-US">        "space": "dhcp4"</span></p>
<p class="x_MsoNormal"><span lang="EN-US">      },</span></p>
<p class="x_MsoNormal"><span lang="EN-US">      {</span></p>
<p class="x_MsoNormal"><span lang="EN-US">        "always-send": false,</span></p>
<p class="x_MsoNormal"><span lang="EN-US">        "code": 119,</span></p>
<p class="x_MsoNormal"><span lang="EN-US">        "csv-format": false,</span></p>
<p class="x_MsoNormal"><span lang="EN-US">        "data": "057465636F6D046E6E6F76027275000A7465636F6D67726F757002727500",</span></p>
<p class="x_MsoNormal"><span lang="EN-US">        "name": "domain-search",</span></p>
<p class="x_MsoNormal"><span lang="EN-US">        "space": "dhcp4"</span></p>
<p class="x_MsoNormal"><span lang="EN-US">      }</span></p>
<p class="x_MsoNormal"><span lang="EN-US">    ],</span></p>
<p class="x_MsoNormal"><span lang="EN-US">    "option-def": [ ],</span></p>
<p class="x_MsoNormal"><span lang="EN-US">    "t1-percent": 0.5,</span></p>
<p class="x_MsoNormal"><span lang="EN-US">    "t2-percent": 0.875,</span></p>
<p class="x_MsoNormal"><span lang="EN-US">    "reservation-mode": "all",</span></p>
<p class="x_MsoNormal"><span lang="EN-US">    "sanity-checks": {</span></p>
<p class="x_MsoNormal"><span lang="EN-US">      "lease-checks": "warn"</span></p>
<p class="x_MsoNormal"><span lang="EN-US">    },</span></p>
<p class="x_MsoNormal"><span lang="EN-US">    "server-hostname": "",</span></p>
<p class="x_MsoNormal"><span lang="EN-US">    "server-tag": "",</span></p>
<p class="x_MsoNormal"><span lang="EN-US">    "shared-networks": [ ],</span></p>
<p class="x_MsoNormal"><span lang="EN-US">    "subnet4": [</span></p>
<p class="x_MsoNormal"><span lang="EN-US">      {</span></p>
<p class="x_MsoNormal"><span lang="EN-US">        "4o6-interface": "",</span></p>
<p class="x_MsoNormal"><span lang="EN-US">        "4o6-interface-id": "",</span></p>
<p class="x_MsoNormal"><span lang="EN-US">        "4o6-subnet": "",</span></p>
<p class="x_MsoNormal"><span lang="EN-US">        "authoritative": false,</span></p>
<p class="x_MsoNormal"><span lang="EN-US">        "calculate-tee-times": true,</span></p>
<p class="x_MsoNormal"><span lang="EN-US">        "id": 18,</span></p>
<p class="x_MsoNormal"><span lang="EN-US">        "match-client-id": false,</span></p>
<p class="x_MsoNormal"><span lang="EN-US">        "next-server": "1.1.1.1",</span></p>
<p class="x_MsoNormal"><span lang="EN-US">        "option-data": [</span></p>
<p class="x_MsoNormal"><span lang="EN-US">          {</span></p>
<p class="x_MsoNormal"><span lang="EN-US">            "always-send": false,</span></p>
<p class="x_MsoNormal"><span lang="EN-US">            "code": 3,</span></p>
<p class="x_MsoNormal"><span lang="EN-US">            "csv-format": true,</span></p>
<p class="x_MsoNormal"><span lang="EN-US">            "data": "10.0.50.1",</span></p>
<p class="x_MsoNormal"><span lang="EN-US">            "name": "routers",</span></p>
<p class="x_MsoNormal"><span lang="EN-US">            "space": "dhcp4"</span></p>
<p class="x_MsoNormal"><span lang="EN-US">          },</span></p>
<p class="x_MsoNormal"><span lang="EN-US">          {</span></p>
<p class="x_MsoNormal"><span lang="EN-US">            "always-send": false,</span></p>
<p class="x_MsoNormal"><span lang="EN-US">            "code": 6,</span></p>
<p class="x_MsoNormal"><span lang="EN-US">            "csv-format": true,</span></p>
<p class="x_MsoNormal"><span lang="EN-US">            "data": "10.200.0.1",</span></p>
<p class="x_MsoNormal"><span lang="EN-US">            "name": "domain-name-servers",</span></p>
<p class="x_MsoNormal"><span lang="EN-US">            "space": "dhcp4"</span></p>
<p class="x_MsoNormal"><span lang="EN-US">          },</span></p>
<p class="x_MsoNormal"><span lang="EN-US">          {</span></p>
<p class="x_MsoNormal"><span lang="EN-US">            "always-send": false,</span></p>
<p class="x_MsoNormal"><span lang="EN-US">            "code": 15,</span></p>
<p class="x_MsoNormal"><span lang="EN-US">            "csv-format": true,</span></p>
<p class="x_MsoNormal"><span lang="EN-US">            "data": "bncvbn.nnn",</span></p>
<p class="x_MsoNormal"><span lang="EN-US">            "name": "domain-name",</span></p>
<p class="x_MsoNormal"><span lang="EN-US">            "space": "dhcp4"</span></p>
<p class="x_MsoNormal"><span lang="EN-US">          }</span></p>
<p class="x_MsoNormal"><span lang="EN-US">        ],</span></p>
<p class="x_MsoNormal"><span lang="EN-US">        "pools": [</span></p>
<p class="x_MsoNormal"><span lang="EN-US">          {</span></p>
<p class="x_MsoNormal"><span lang="EN-US">            "option-data": [ ],</span></p>
<p class="x_MsoNormal"><span lang="EN-US">            "pool": "10.0.50.10-10.0.50.80"</span></p>
<p class="x_MsoNormal"><span lang="EN-US">          }</span></p>
<p class="x_MsoNormal"><span lang="EN-US">        ],</span></p>
<p class="x_MsoNormal"><span lang="EN-US">        "relay": {</span></p>
<p class="x_MsoNormal"><span lang="EN-US">          "ip-addresses": [ "10.0.50.1" ]</span></p>
<p class="x_MsoNormal"><span lang="EN-US">        },</span></p>
<p class="x_MsoNormal"><span lang="EN-US">        "reservation-mode": "all",</span></p>
<p class="x_MsoNormal"><span lang="EN-US">        "reservations": [],</span></p>
<p class="x_MsoNormal"><span lang="EN-US">        "subnet": "10.0.50.0/24",</span></p>
<p class="x_MsoNormal"><span lang="EN-US">        "t1-percent": 0.5,</span></p>
<p class="x_MsoNormal"><span lang="EN-US">        "t2-percent": 0.875,</span></p>
<p class="x_MsoNormal"><span lang="EN-US">        "valid-lifetime": 86400</span></p>
<p class="x_MsoNormal"><span lang="EN-US">      }</span></p>
<p class="x_MsoNormal"><span lang="EN-US">    ],</span></p>
<p class="x_MsoNormal"><span lang="EN-US">    "t1-percent": 0.5,</span></p>
<p class="x_MsoNormal"><span lang="EN-US">    "t2-percent": 0.875,</span></p>
<p class="x_MsoNormal"><span lang="EN-US">    </span>"valid-lifetime": 4000</p>
<p class="x_MsoNormal">  }</p>
<p class="x_MsoNormal">}</p>
<p class="x_MsoNormal"> </p>
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