2021-02-15 15:45:33 +02:00
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.. _hooks-run-script:
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Run Script Support
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==================
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2021-02-15 16:14:25 +02:00
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This hooks library adds support for calling an external script for specific
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packet processing hook points.
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2021-02-15 15:45:33 +02:00
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The library is available since Kea 1.9.5 and can be loaded in a
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similar way as other hook libraries by the ``kea-dhcp4`` and
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``kea-dhcp6`` processes.
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2021-02-17 16:43:58 +02:00
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.. code-block:: json
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2021-02-15 15:45:33 +02:00
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2021-02-17 16:43:58 +02:00
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{
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2021-02-16 18:44:59 +02:00
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"hooks-libraries": [
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2021-02-17 16:43:58 +02:00
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{
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"library": "/usr/local/lib/libdhcp_run_script.so",
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2021-02-15 15:45:33 +02:00
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"parameters": {
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2021-02-19 12:15:30 +02:00
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"name": "/full_path_to/script_name.sh",
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2021-02-15 15:45:33 +02:00
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"sync": false
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}
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2021-02-17 16:43:58 +02:00
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}
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2021-02-15 15:45:33 +02:00
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]
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}
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2021-02-19 12:15:30 +02:00
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The parameters contain the 'name' which indicates the full path to the external
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2021-02-16 18:50:57 +02:00
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script to be called on each hookpoint, and also the 'sync' option to be able
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to wait synchronously for the script to finish execution.
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2021-02-15 15:45:33 +02:00
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If the 'sync' parameter is false, then the script will be launched and Kea
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will not wait for the execution to finish, causing all the OUT parameters of
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the script (including next step) to be ignored.
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.. note::
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Currently the functionality underneath 'sync' parameter is not implemented
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and enabling synchronous calls to external script is not supported.
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.. _hooks-run-script-hook-points:
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This library has several hook points functions implemented which will be
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called at the specific packet processing stage.
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The dhcpv4 hook points:
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::
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lease4_renew
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lease4_expire
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lease4_recover
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leases4_committed
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lease4_release
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lease4_decline
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The dhcpv6 hook points:
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::
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lease6_renew
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lease6_rebind
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lease6_expire
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lease6_recover
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leases6_committed
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lease6_release
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lease6_decline
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Each hook point extracts the Kea internal data and exports it as string
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environment variables. These parameters are shared with the target script
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using the child process environment.
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The only parameter passed to the call of the target script is the name of
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the hook point.
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An example of a script implementing all hook points is presented below.
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::
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#!/bin/bash
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unknown_handle() {
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2021-02-16 19:44:26 +02:00
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echo "Unhandled function call ${*}"
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2021-02-15 15:45:33 +02:00
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exit 123
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}
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lease4_renew () {
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...
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}
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lease4_expire () {
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...
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}
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lease4_recover () {
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...
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}
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leases4_committed () {
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...
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}
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lease4_release () {
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...
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}
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lease4_decline () {
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...
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}
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lease6_renew () {
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...
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}
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lease6_rebind () {
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...
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}
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lease6_expire () {
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...
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}
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lease6_recover () {
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...
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}
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leases6_committed () {
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...
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}
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lease6_release () {
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...
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}
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lease6_decline () {
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...
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}
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case "$1" in
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"lease4_renew")
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lease4_renew
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;;
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"lease4_expire")
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lease4_expire
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;;
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"lease4_recover")
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lease4_recover
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;;
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"leases4_committed")
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leases4_committed
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;;
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"lease4_release")
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lease4_release
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;;
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"lease4_decline")
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lease4_decline
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;;
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"lease6_renew")
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lease6_renew
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;;
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"lease6_rebind")
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lease6_rebind
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;;
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"lease6_expire")
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lease6_expire
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;;
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"lease6_recover")
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lease6_recover
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;;
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"leases6_committed")
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leases6_committed
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;;
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"lease6_release")
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lease6_release
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;;
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"lease6_decline")
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lease6_decline
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;;
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*)
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unknown_handle "${@}"
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;;
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esac
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.. _hooks-run-script-exported-environment-variables:
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Available parameters for each hook points are presented below.
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DHCPv4:
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lease4_renew
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::
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QUERY4_TYPE
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QUERY4_TXID
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QUERY4_LOCAL_ADDR
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QUERY4_LOCAL_PORT
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QUERY4_REMOTE_ADDR
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QUERY4_REMOTE_PORT
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QUERY4_IFACE_INDEX
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QUERY4_IFACE_NAME
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QUERY4_HOPS
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QUERY4_SECS
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QUERY4_FLAGS
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QUERY4_CIADDR
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QUERY4_SIADDR
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QUERY4_YIADDR
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QUERY4_GIADDR
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QUERY4_RELAYED
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QUERY4_HWADDR
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QUERY4_HWADDR_TYPE
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QUERY4_LOCAL_HWADDR
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QUERY4_LOCAL_HWADDR_TYPE
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QUERY4_REMOTE_HWADDR
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QUERY4_REMOTE_HWADDR_TYPE
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SUBNET4_ID
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SUBNET4_NAME
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SUBNET4_PREFIX
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SUBNET4_PREFIX_LEN
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PKT4_CLIENT_ID
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PKT4_HWADDR
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PKT4_HWADDR_TYPE
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LEASE4_ADDRESS
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LEASE4_CLTT
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LEASE4_HOSTNAME
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LEASE4_HWADDR
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LEASE4_HWADDR_TYPE
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LEASE4_STATE
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LEASE4_SUBNET_ID
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LEASE4_VALID_LIFETIME
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LEASE4_CLIENT_ID
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lease4_expire
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::
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LEASE4_ADDRESS
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LEASE4_CLTT
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LEASE4_HOSTNAME
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LEASE4_HWADDR
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LEASE4_HWADDR_TYPE
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LEASE4_STATE
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LEASE4_SUBNET_ID
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LEASE4_VALID_LIFETIME
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LEASE4_CLIENT_ID
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REMOVE_LEASE
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lease4_recover
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::
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LEASE4_ADDRESS
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LEASE4_CLTT
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LEASE4_HOSTNAME
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LEASE4_HWADDR
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LEASE4_HWADDR_TYPE
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LEASE4_STATE
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LEASE4_SUBNET_ID
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LEASE4_VALID_LIFETIME
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LEASE4_CLIENT_ID
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leases4_committed
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::
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QUERY4_TYPE
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QUERY4_TXID
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QUERY4_LOCAL_ADDR
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QUERY4_LOCAL_PORT
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QUERY4_REMOTE_ADDR
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QUERY4_REMOTE_PORT
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QUERY4_IFACE_INDEX
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QUERY4_IFACE_NAME
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QUERY4_HOPS
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QUERY4_SECS
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QUERY4_FLAGS
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QUERY4_CIADDR
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QUERY4_SIADDR
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QUERY4_YIADDR
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QUERY4_GIADDR
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QUERY4_RELAYED
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QUERY4_HWADDR
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QUERY4_HWADDR_TYPE
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QUERY4_LOCAL_HWADDR
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QUERY4_LOCAL_HWADDR_TYPE
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QUERY4_REMOTE_HWADDR
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QUERY4_REMOTE_HWADDR_TYPE
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LEASES4_SIZE
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DELETED_LEASES4_SIZE
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If LEASES4_SIZE or DELETED_LEASES4_SIZE are non zero, then each lease
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will have it's own unique identifier as shown below. First index starts
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at 0.
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::
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LEASES4_AT0_ADDRESS
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LEASES4_AT0_CLTT
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LEASES4_AT0_HOSTNAME
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LEASES4_AT0_HWADDR
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LEASES4_AT0_HWADDR_TYPE
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LEASES4_AT0_STATE
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LEASES4_AT0_SUBNET_ID
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LEASES4_AT0_VALID_LIFETIME
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LEASES4_AT0_CLIENT_ID
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DELETED_LEASES4_AT0_ADDRESS
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DELETED_LEASES4_AT0_CLTT
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DELETED_LEASES4_AT0_HOSTNAME
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DELETED_LEASES4_AT0_HWADDR
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DELETED_LEASES4_AT0_HWADDR_TYPE
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DELETED_LEASES4_AT0_STATE
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DELETED_LEASES4_AT0_SUBNET_ID
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DELETED_LEASES4_AT0_VALID_LIFETIME
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DELETED_LEASES4_AT0_CLIENT_ID
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lease4_release
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::
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QUERY4_TYPE
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QUERY4_TXID
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QUERY4_LOCAL_ADDR
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QUERY4_LOCAL_PORT
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QUERY4_REMOTE_ADDR
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QUERY4_REMOTE_PORT
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QUERY4_IFACE_INDEX
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QUERY4_IFACE_NAME
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QUERY4_HOPS
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QUERY4_SECS
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QUERY4_FLAGS
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QUERY4_CIADDR
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QUERY4_SIADDR
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QUERY4_YIADDR
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QUERY4_GIADDR
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QUERY4_RELAYED
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QUERY4_HWADDR
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QUERY4_HWADDR_TYPE
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QUERY4_LOCAL_HWADDR
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QUERY4_LOCAL_HWADDR_TYPE
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QUERY4_REMOTE_HWADDR
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QUERY4_REMOTE_HWADDR_TYPE
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LEASE4_ADDRESS
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LEASE4_CLTT
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LEASE4_HOSTNAME
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LEASE4_HWADDR
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LEASE4_HWADDR_TYPE
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LEASE4_STATE
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LEASE4_SUBNET_ID
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LEASE4_VALID_LIFETIME
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LEASE4_CLIENT_ID
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lease4_decline
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::
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QUERY4_TYPE
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QUERY4_TXID
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QUERY4_LOCAL_ADDR
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QUERY4_LOCAL_PORT
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QUERY4_REMOTE_ADDR
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QUERY4_REMOTE_PORT
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QUERY4_IFACE_INDEX
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|
QUERY4_IFACE_NAME
|
|
|
|
|
QUERY4_HOPS
|
|
|
|
|
QUERY4_SECS
|
|
|
|
|
QUERY4_FLAGS
|
|
|
|
|
QUERY4_CIADDR
|
|
|
|
|
QUERY4_SIADDR
|
|
|
|
|
QUERY4_YIADDR
|
|
|
|
|
QUERY4_GIADDR
|
|
|
|
|
QUERY4_RELAYED
|
|
|
|
|
QUERY4_HWADDR
|
|
|
|
|
QUERY4_HWADDR_TYPE
|
|
|
|
|
QUERY4_LOCAL_HWADDR
|
|
|
|
|
QUERY4_LOCAL_HWADDR_TYPE
|
|
|
|
|
QUERY4_REMOTE_HWADDR
|
|
|
|
|
QUERY4_REMOTE_HWADDR_TYPE
|
|
|
|
|
LEASE4_ADDRESS
|
|
|
|
|
LEASE4_CLTT
|
|
|
|
|
LEASE4_HOSTNAME
|
|
|
|
|
LEASE4_HWADDR
|
|
|
|
|
LEASE4_HWADDR_TYPE
|
|
|
|
|
LEASE4_STATE
|
|
|
|
|
LEASE4_SUBNET_ID
|
|
|
|
|
LEASE4_VALID_LIFETIME
|
|
|
|
|
LEASE4_CLIENT_ID
|
|
|
|
|
|
|
|
|
|
DHCPv6:
|
|
|
|
|
|
|
|
|
|
lease6_renew
|
|
|
|
|
|
|
|
|
|
::
|
|
|
|
|
|
|
|
|
|
QUERY6_TYPE
|
|
|
|
|
QUERY6_TXID
|
|
|
|
|
QUERY6_LOCAL_ADDR
|
|
|
|
|
QUERY6_LOCAL_PORT
|
|
|
|
|
QUERY6_REMOTE_ADDR
|
|
|
|
|
QUERY6_REMOTE_PORT
|
|
|
|
|
QUERY6_IFACE_INDEX
|
|
|
|
|
QUERY6_IFACE_NAME
|
|
|
|
|
QUERY6_REMOTE_HWADDR
|
|
|
|
|
QUERY6_REMOTE_HWADDR_TYPE
|
|
|
|
|
QUERY6_PROTO
|
|
|
|
|
QUERY6_CLIENT_ID
|
|
|
|
|
LEASE6_ADDRESS
|
|
|
|
|
LEASE6_CLTT
|
|
|
|
|
LEASE6_HOSTNAME
|
|
|
|
|
LEASE6_HWADDR
|
|
|
|
|
LEASE6_HWADDR_TYPE
|
|
|
|
|
LEASE6_STATE
|
|
|
|
|
LEASE6_SUBNET_ID
|
|
|
|
|
LEASE6_VALID_LIFETIME
|
|
|
|
|
LEASE6_DUID
|
|
|
|
|
LEASE6_IAID
|
|
|
|
|
LEASE6_PREFERRED_LIFETIME
|
|
|
|
|
LEASE6_PREFIX_LEN
|
|
|
|
|
LEASE6_TYPE
|
|
|
|
|
PKT6_IA_IAID
|
|
|
|
|
PKT6_IA_IA_TYPE
|
|
|
|
|
PKT6_IA_IA_T1
|
|
|
|
|
PKT6_IA_IA_T2
|
|
|
|
|
|
|
|
|
|
lease6_rebind
|
|
|
|
|
|
|
|
|
|
::
|
|
|
|
|
|
|
|
|
|
QUERY6_TYPE
|
|
|
|
|
QUERY6_TXID
|
|
|
|
|
QUERY6_LOCAL_ADDR
|
|
|
|
|
QUERY6_LOCAL_PORT
|
|
|
|
|
QUERY6_REMOTE_ADDR
|
|
|
|
|
QUERY6_REMOTE_PORT
|
|
|
|
|
QUERY6_IFACE_INDEX
|
|
|
|
|
QUERY6_IFACE_NAME
|
|
|
|
|
QUERY6_REMOTE_HWADDR
|
|
|
|
|
QUERY6_REMOTE_HWADDR_TYPE
|
|
|
|
|
QUERY6_PROTO
|
|
|
|
|
QUERY6_CLIENT_ID
|
|
|
|
|
LEASE6_ADDRESS
|
|
|
|
|
LEASE6_CLTT
|
|
|
|
|
LEASE6_HOSTNAME
|
|
|
|
|
LEASE6_HWADDR
|
|
|
|
|
LEASE6_HWADDR_TYPE
|
|
|
|
|
LEASE6_STATE
|
|
|
|
|
LEASE6_SUBNET_ID
|
|
|
|
|
LEASE6_VALID_LIFETIME
|
|
|
|
|
LEASE6_DUID
|
|
|
|
|
LEASE6_IAID
|
|
|
|
|
LEASE6_PREFERRED_LIFETIME
|
|
|
|
|
LEASE6_PREFIX_LEN
|
|
|
|
|
LEASE6_TYPE
|
|
|
|
|
PKT6_IA_IAID
|
|
|
|
|
PKT6_IA_IA_TYPE
|
|
|
|
|
PKT6_IA_IA_T1
|
|
|
|
|
PKT6_IA_IA_T2
|
|
|
|
|
|
|
|
|
|
lease6_expire
|
|
|
|
|
|
|
|
|
|
::
|
|
|
|
|
|
|
|
|
|
LEASE6_ADDRESS
|
|
|
|
|
LEASE6_CLTT
|
|
|
|
|
LEASE6_HOSTNAME
|
|
|
|
|
LEASE6_HWADDR
|
|
|
|
|
LEASE6_HWADDR_TYPE
|
|
|
|
|
LEASE6_STATE
|
|
|
|
|
LEASE6_SUBNET_ID
|
|
|
|
|
LEASE6_VALID_LIFETIME
|
|
|
|
|
LEASE6_DUID
|
|
|
|
|
LEASE6_IAID
|
|
|
|
|
LEASE6_PREFERRED_LIFETIME
|
|
|
|
|
LEASE6_PREFIX_LEN
|
|
|
|
|
LEASE6_TYPE
|
|
|
|
|
REMOVE_LEASE
|
|
|
|
|
|
|
|
|
|
lease6_recover
|
|
|
|
|
|
|
|
|
|
::
|
|
|
|
|
|
|
|
|
|
LEASE6_ADDRESS
|
|
|
|
|
LEASE6_CLTT
|
|
|
|
|
LEASE6_HOSTNAME
|
|
|
|
|
LEASE6_HWADDR
|
|
|
|
|
LEASE6_HWADDR_TYPE
|
|
|
|
|
LEASE6_STATE
|
|
|
|
|
LEASE6_SUBNET_ID
|
|
|
|
|
LEASE6_VALID_LIFETIME
|
|
|
|
|
LEASE6_DUID
|
|
|
|
|
LEASE6_IAID
|
|
|
|
|
LEASE6_PREFERRED_LIFETIME
|
|
|
|
|
LEASE6_PREFIX_LEN
|
|
|
|
|
LEASE6_TYPE
|
|
|
|
|
|
|
|
|
|
leases6_committed
|
|
|
|
|
|
|
|
|
|
::
|
|
|
|
|
|
|
|
|
|
QUERY6_TYPE
|
|
|
|
|
QUERY6_TXID
|
|
|
|
|
QUERY6_LOCAL_ADDR
|
|
|
|
|
QUERY6_LOCAL_PORT
|
|
|
|
|
QUERY6_REMOTE_ADDR
|
|
|
|
|
QUERY6_REMOTE_PORT
|
|
|
|
|
QUERY6_IFACE_INDEX
|
|
|
|
|
QUERY6_IFACE_NAME
|
|
|
|
|
QUERY6_REMOTE_HWADDR
|
|
|
|
|
QUERY6_REMOTE_HWADDR_TYPE
|
|
|
|
|
QUERY6_PROTO
|
|
|
|
|
QUERY6_CLIENT_ID
|
|
|
|
|
LEASES6_SIZE
|
|
|
|
|
DELETED_LEASES6_SIZE
|
|
|
|
|
|
|
|
|
|
If LEASES6_SIZE or DELETED_LEASES6_SIZE are non zero, then each lease
|
|
|
|
|
will have it's own unique identifier as shown below. First index starts
|
|
|
|
|
at 0.
|
|
|
|
|
|
|
|
|
|
::
|
|
|
|
|
|
|
|
|
|
LEASES6_AT0_ADDRESS
|
|
|
|
|
LEASES6_AT0_CLTT
|
|
|
|
|
LEASES6_AT0_HOSTNAME
|
|
|
|
|
LEASES6_AT0_HWADDR
|
|
|
|
|
LEASES6_AT0_HWADDR_TYPE
|
|
|
|
|
LEASES6_AT0_STATE
|
|
|
|
|
LEASES6_AT0_SUBNET_ID
|
|
|
|
|
LEASES6_AT0_VALID_LIFETIME
|
|
|
|
|
LEASES6_AT0_DUID
|
|
|
|
|
LEASES6_AT0_IAID
|
|
|
|
|
LEASES6_AT0_PREFERRED_LIFETIME
|
|
|
|
|
LEASES6_AT0_PREFIX_LEN
|
|
|
|
|
LEASES6_AT0_TYPE
|
|
|
|
|
DELETED_LEASES6_AT0_ADDRESS
|
|
|
|
|
DELETED_LEASES6_AT0_CLTT
|
|
|
|
|
DELETED_LEASES6_AT0_HOSTNAME
|
|
|
|
|
DELETED_LEASES6_AT0_HWADDR
|
|
|
|
|
DELETED_LEASES6_AT0_HWADDR_TYPE
|
|
|
|
|
DELETED_LEASES6_AT0_STATE
|
|
|
|
|
DELETED_LEASES6_AT0_SUBNET_ID
|
|
|
|
|
DELETED_LEASES6_AT0_VALID_LIFETIME
|
|
|
|
|
DELETED_LEASES6_AT0_DUID
|
|
|
|
|
DELETED_LEASES6_AT0_IAID
|
|
|
|
|
DELETED_LEASES6_AT0_PREFERRED_LIFETIME
|
|
|
|
|
DELETED_LEASES6_AT0_PREFIX_LEN
|
|
|
|
|
DELETED_LEASES6_AT0_TYPE
|
|
|
|
|
|
|
|
|
|
lease6_release
|
|
|
|
|
|
|
|
|
|
::
|
|
|
|
|
|
|
|
|
|
QUERY6_TYPE
|
|
|
|
|
QUERY6_TXID
|
|
|
|
|
QUERY6_LOCAL_ADDR
|
|
|
|
|
QUERY6_LOCAL_PORT
|
|
|
|
|
QUERY6_REMOTE_ADDR
|
|
|
|
|
QUERY6_REMOTE_PORT
|
|
|
|
|
QUERY6_IFACE_INDEX
|
|
|
|
|
QUERY6_IFACE_NAME
|
|
|
|
|
QUERY6_REMOTE_HWADDR
|
|
|
|
|
QUERY6_REMOTE_HWADDR_TYPE
|
|
|
|
|
QUERY6_PROTO
|
|
|
|
|
QUERY6_CLIENT_ID
|
|
|
|
|
LEASE6_ADDRESS
|
|
|
|
|
LEASE6_CLTT
|
|
|
|
|
LEASE6_HOSTNAME
|
|
|
|
|
LEASE6_HWADDR
|
|
|
|
|
LEASE6_HWADDR_TYPE
|
|
|
|
|
LEASE6_STATE
|
|
|
|
|
LEASE6_SUBNET_ID
|
|
|
|
|
LEASE6_VALID_LIFETIME
|
|
|
|
|
LEASE6_DUID
|
|
|
|
|
LEASE6_IAID
|
|
|
|
|
LEASE6_PREFERRED_LIFETIME
|
|
|
|
|
LEASE6_PREFIX_LEN
|
|
|
|
|
LEASE6_TYPE
|
|
|
|
|
|
|
|
|
|
lease6_decline
|
|
|
|
|
|
|
|
|
|
::
|
|
|
|
|
|
|
|
|
|
QUERY6_TYPE
|
|
|
|
|
QUERY6_TXID
|
|
|
|
|
QUERY6_LOCAL_ADDR
|
|
|
|
|
QUERY6_LOCAL_PORT
|
|
|
|
|
QUERY6_REMOTE_ADDR
|
|
|
|
|
QUERY6_REMOTE_PORT
|
|
|
|
|
QUERY6_IFACE_INDEX
|
|
|
|
|
QUERY6_IFACE_NAME
|
|
|
|
|
QUERY6_REMOTE_HWADDR
|
|
|
|
|
QUERY6_REMOTE_HWADDR_TYPE
|
|
|
|
|
QUERY6_PROTO
|
|
|
|
|
QUERY6_CLIENT_ID
|
|
|
|
|
LEASE6_ADDRESS
|
|
|
|
|
LEASE6_CLTT
|
|
|
|
|
LEASE6_HOSTNAME
|
|
|
|
|
LEASE6_HWADDR
|
|
|
|
|
LEASE6_HWADDR_TYPE
|
|
|
|
|
LEASE6_STATE
|
|
|
|
|
LEASE6_SUBNET_ID
|
|
|
|
|
LEASE6_VALID_LIFETIME
|
|
|
|
|
LEASE6_DUID
|
|
|
|
|
LEASE6_IAID
|
|
|
|
|
LEASE6_PREFERRED_LIFETIME
|
|
|
|
|
LEASE6_PREFIX_LEN
|
|
|
|
|
LEASE6_TYPE
|
