{"id":804,"date":"2015-02-26T10:11:28","date_gmt":"2015-02-26T08:11:28","guid":{"rendered":"https:\/\/excentiscom.webhosting.be\/?p=804"},"modified":"2022-06-24T08:28:40","modified_gmt":"2022-06-24T06:28:40","slug":"how-to-provision-a-cable-modem-using-the-isc-dhcp-server","status":"publish","type":"post","link":"https:\/\/www.excentis.com\/blog\/how-to-provision-a-cable-modem-using-the-isc-dhcp-server\/","title":{"rendered":"How to provision a cable modem using the ISC DHCP server"},"content":{"rendered":"<p>Since the early days of DOCSIS, cable modems are provisioned using DHCP, the Dynamic Host Configuration Protocol, to obtain the basic connectivity settings.<\/p>\n<p>When the cable modem is powered on, it begins the ranging process with the CMTS. When the ranging process completes, the cable modem starts with the IP provisioning process, which initiates with the Dynamic Host Configuration Protocol (DHCP). DHCP is used to retrieve an IP address, to announce capabilities and retrieve parameters for the next stage of provisioning: acquire the current time and the configuration file. Using all the configuration parameters gathered in the DHCP process and the configuration file download, the cable modem can register with the CMTS.<\/p>\n<p>This blog post shows how to configure the\u00a0<a href=\"https:\/\/www.isc.org\/downloads\/dhcp\/\">ISC DHCP server<\/a>\u00a0to provision cable modems.<\/p>\n<h2>DHCP and DOCSIS<\/h2>\n<p>Because cable modems need non-standard DHCP options, CableLabs has written a\u00a0<a href=\"https:\/\/www.cablelabs.com\/specifications\/CL-SP-CANN-DHCP-Reg\">specification to define new options<\/a>. The options required for a cable modem to boot, are defined in the MAC and Upper Layer Protocols Interface (MULPI) Specification.<\/p>\n<p>For IPv4, the following DHCP parameters and options must be provided by the DHCP server:<\/p>\n<ul>\n<li>yiaddr: IP address to be used by the cable modem<\/li>\n<li>next-server: IP address of the TFTP server to be used to download the configuration file from (Required for DOCSIS2.0 cable modems)<\/li>\n<li>boot-file-name: Name of the configuration file to be downloaded from the TFTP server. By the way, we have a separate blog post on\u00a0<a href=\"https:\/\/www.excentis.com\/blog\/how-create-cable-modem-config-file\">how to create a cable modem config file<\/a>.<\/li>\n<li>option 1: subnet mask (optional)<\/li>\n<li>option 2: time offset of the CM from UTC (optional)<\/li>\n<li>option 3: router option: list of routers to be used to forward traffic from the cable modem. (optional, but recommended)<\/li>\n<li>option 4: time server option, Time of Day server(s) to be used by the cable modem to synchronize its clock with. (optional, but recommended)<\/li>\n<li>option 125.2: CL_V4OPTION_TFTP_SERVERS \u00a0&#8211; Override for the TFTP server specified in next-server<\/li>\n<\/ul>\n<p>In DHCPv6, the options are defined as vendor specific options. \u00a0Only the IPv6 address information (IA_NA) is configured using the standard DHCPv6 options. The vendor specific options are as following:<\/p>\n<ul>\n<li>option 17.37: CL_OPTION_TIME_SERVERS &#8211; Time Protocol Servers option\u00a0(optional)<\/li>\n<li>option 17.38: CL_OPTION_TIME_OFFSET &#8211; \u00a0Time Offset option\u00a0(optional)<\/li>\n<li>option 17.32: CL_OPTION_TFTP_SERVERS &#8211; TFTP Servers Address option<\/li>\n<li>option 17.33: CL_OPTION_CONFIG_FILE_NAME &#8211; Configuration File Name option<\/li>\n<li>option 17.34: CL_OPTION_SYSLOG_SERVERS &#8211; Syslog Server Address option (optional)<\/li>\n<\/ul>\n<h2>Configuring ISC DHCP<\/h2>\n<p>We will be using the\u00a0<a href=\"https:\/\/www.isc.org\/downloads\/dhcp\/\">ISC DHCP server<\/a>\u00a0in this blog post. In the section above, we learned which options are required to provision a cable modem, but some are not known by ISC by default. Fortunately, the ISC DHCP server can be extended with other, non-standard options.<\/p>\n<p>Also the ISC DHCP server (or daemon) cannot run in multiple IP modes (IPv4, IPv6) at the same time, therefore the daemon must be started once for every IP mode.<\/p>\n<p>In this section we will show how to configure each of these instances of the ISC DHCP server.<\/p>\n<h3>DHCPv4<\/h3>\n<p>The DHCPv4 configuration file:<\/p>\n<pre># dhcpd-v4.conf\r\n\r\n# DHCPv4 server configuration statements\r\n\r\n# Where does DHCPd needs to save its leases database\r\n# \/var\/db\/dhcpdv4.leases is probably a good location?\r\nlease-file-name \"\/path\/to\/dhcpdv4.leases\";\r\n\r\n# Is this DHCP server the authorative DHCP server in this network?\r\n# In this case, it is not.\r\n#authorative;\r\n\r\n# Where to send its logmessages?\r\nlog-facility local7;\r\n\r\n# Common options for all hosts\r\n\r\n# Assume our syslog server is at 10.16.0.2\r\noption log-servers 10.16.0.2;\r\n\r\n# Assume our time servers are at 10.16.0.3 and 10.17.0.3\r\n# This configuration will provide a fallback for the time servers\r\noption time-servers 10.16.0.3, 10.17.0.3;\r\n\r\n# Assume our configuration file server (TFTP server) is at 10.16.0.4 and 10.17.0.4\r\n# Old (pre DOCSIS 3.0) modems use the next-server field of the DHCP message\r\nnext-server 10.16.0.4\r\n\r\n# DOCSIS 3.0+ modems only use next-server if the vivso.2 option is not available\r\n# The newer vivso.2 option allows multiple addresses and thus fallback mechanisms\r\n# Due to some limitations in the ISC dhcpd configuration, we need to encode this in\r\n# hexadecimal, so let's do this:\r\noption vivso 00:00:11:8b:0a:02:08:0a:10:00:04:0a:11:00:04;\r\n\r\n\r\n# Subnet configuration\r\n# The DHCP server needs a subnet declaration for at least one of the provisioning interfaces,\r\n# so we assume the provisioning interface (the interface used by the relay-agent of the CMTS\r\n# is 10.16.0.5.  We also don't want this DHCP server to provision our backend, so we declare \r\n# the network, but don't allow the server to hand out any leases\r\nsubnet 10.16.0.0 netmask 255.255.255.0 {\r\n    ignore booting;\r\n}\r\n\r\n# subnets for the cable modems:\r\nsubnet 10.128.0.0 netmask 255.255.0.0 {\r\n    # CMTS-1\r\n    range 10.128.0.2 10.128.255.254;\r\n    option broadcast-address 10.128.255.255;\r\n\r\n    default-lease-time 23200;\r\n    max-lease-time 86400;\r\n    # only allow known cable modems\r\n    deny unknown-clients;\r\n}\r\n\r\n# subnets for the customer equipment \r\nsubnet 123.128.0.0 netmask 255.255.0.0 {\r\n    # CMTS-1\r\n    # we keep 123.128.0.2-123.128.0.255 for fixed addresses\r\n    range 123.128.1.1 123.128.255.254;\r\n    option routers 123.128.0.1;\r\n    option broadcast-address 123.128.255.255;\r\n    \r\n    default-lease-time 3600;    max-lease-time 7200;\r\n    # allow unknown clients, we don't want to keep track \r\n    # of all end user equipment\r\n    allow unknown-clients;\r\n}\r\n\r\n# Cable modem declarations\r\nhost cm-00ff1f000001 {\r\n    hardware ethernet 00:ff:1f:00:00:01;\r\n    # configure the boot-file name DHCP parameter\r\n    # this customer has an unlimited subscription\r\n    filename \"cm\/unlimited.cfg\";\r\n    option bootfile-name \"cm\/unlimited.cfg\";\r\n}\r\n\r\nhost cm-00ff1f000002 {\r\n    hardware ethernet 00:ff:1f:00:00:02;\r\n    # configure the boot-file name DHCP parameter\r\n    # this customer has a limited 20\/2 subscription\r\n    filename \"cm\/limited-20-2.cfg\";\r\n    option bootfile-name \"cm\/unlimited.cfg\";\r\n}\r\n\r\n# Enterprise customers get a fixed IP for their gateways.\r\n# The MAC address is given by them\r\nhost customer-1-excentis {\r\n    hardware ethernet 00:ff:1f:00:00:03;\r\n    fixed-address 123.128.0.8;\r\n}\r\n<\/pre>\n<p>In the example above, a lot of information is stored. Let&#8217;s walk through it.<\/p>\n<p>First we provide the DHCP server&#8217;s configuration for internal bookkeeping. This way, the DHCP server knows where to store its lease database and whether or not it is authorative for this network.<\/p>\n<p>Next common options for all hosts are configured. It seems all pretty straight-forward but a vivso option is configured with a strange hexadecimal value and the CL_V4OPTION_TFTP_SERVERS is not.<br \/>\nThis is because, due to a limitation of ISC DHCPd, sub options cannot be declared within the vivso option. So what is that vivso option?<br \/>\nWell the vivso &#8216;syntax&#8217; is this:<\/p>\n<pre>option vivso &lt;entreprise number&gt; &lt;length of the vivso TLV contents&gt; &lt;option type&gt; &lt;option length&gt; &lt;option value&gt;...\r\n<\/pre>\n<p>So, for one TFTP address it can be substituted as follows:<\/p>\n<ul>\n<li>Entreprise Number = 4491 (entreprise number of CableLabs, in dotted hex: 00:00:11:8b)<\/li>\n<li>option type = 2 (CL_V4OPTION_TFTPSERVERS)<\/li>\n<li>option length = 4 (bytes in an IP address)<\/li>\n<li>option value = IP address in hex (in our example 10.16.0.4 would be 0a:10:00:04)<\/li>\n<li>length of the vivso TLV contents = 6 (1 byte of type, 1 byte of length and 4 bytes of data)<\/li>\n<\/ul>\n<p>This becomes<\/p>\n<pre>option vivso 00:00:11:8b:06:02:04:0a:10:00:04;\r\n<\/pre>\n<p>For two TFTP server addresses, it changes a little:<\/p>\n<ul>\n<li>Entreprise Number = 4491 (entreprise number of CableLabs, in dotted hex: 00:00:11:8b)<\/li>\n<li>option type = 2 (CL_V4OPTION_TFTPSERVERS)<\/li>\n<li>option length = 4 (bytes in an IP address)<\/li>\n<li>option value = IP addresses in hex (in our example 10.16.0.4 and 10.17.0.4 would be 0a:10:00:04:0a:11:00:04)<\/li>\n<li>length of the vivso TLV contents = 10 (0x0a) (1 byte of type, 1 byte of length and 8 bytes of data)<\/li>\n<\/ul>\n<pre>option vivso 00:00:11:8b:0a:02:08:0a:10:00:04:0a:11:00:04;\r\n<\/pre>\n<p>After these common options, the subnets to be provisioned are configured. These subnet declarations allow all options which can be different between subnets. It is for example possible to configure different name servers or TFTP servers per subnet.<\/p>\n<p>The subnet declarations are followed by the host declarations. When a host is declared in the DHCP servers configuration file, it will get the options specified here.<\/p>\n<p>The complete set of options is created as follows:<\/p>\n<ol>\n<li>Take all global options.<\/li>\n<li>Take all options defined for the network where the DHCP message is received from.<\/li>\n<li>Take all options for the host.<\/li>\n<\/ol>\n<p>This means that a usually best case option can be set globally and be overridden by the subnet or host configuration!<\/p>\n<h3>DHCPv6<\/h3>\n<p>The DHCPv6 configuration file resembles the DHCPv4 configuration file a lot, but it is still a little different. First we need to declare the CableLabs Vendor Specific Information Options.<\/p>\n<pre># declare the option space where the CableLabs options live\r\noption space docsis code width 2 length width 2 hash size 100;\r\n# CL_OPTION_TFTP_SERVERS\r\noption docsis.tftp-servers code 32 = array of ip6-address;\r\n# CL_OPTION_CONFIG_FILE_NAME\r\noption docsis.configuration-file code 33 = text;\r\n# CL_OPTION_SYSLOG_SERVERS\r\noption docsis.syslog-servers code 34 = array of ip6-address;\r\n# CL_OPTION_TIME_SERVERS\r\noption docsis.time-servers code 37 = array of ip6-address;\r\n# CL_OPTION_TIME_OFFSET\r\noption docsis.time-offset code 38 = signed integer 32;\r\n\r\n# declare the option space docsis from above are suboptions of \r\n# the vsio option (17)\r\noption vsio.docsis code 4491 = encapsulate docsis;\r\n<\/pre>\n<p>Now the DHCP server knows the CableLabs specific options, we can configure a subnet:<\/p>\n<pre>subnet6 fd52:1234:134:abcd::\/64 {\r\n    range6 fd52:1234:134:abcd::2 fd52:1234:134:abcd::ffff;\r\n    deny unknown-clients;\r\n    docsis.tftp-servers fd52:1000::3, fd52:1001::3;\r\n    docsis.time-servers fd52:1000::4;\r\n}\r\n<\/pre>\n<p>And hosts:<\/p>\n<pre>host cm-00ff1f000001 {\r\n    clientid 00:03:00:01:00:ff:1f:00:00:01;\r\n    docsis.configuration-file \"cm\/unlimited.cfg\";\r\n}\r\n<\/pre>\n<h2>Starting the DHCP server<\/h2>\n<pre># starting the DHCP server in IPv4 mode\r\n# \/path\/to\/dhcpd -4 -cf \/path\/to\/dhcpdv4.conf\r\n\r\n# starting the DHCP server in IPv6 mode\r\n# \/path\/to\/dhcpd -6 -cf \/path\/to\/dhcpdv6.conf\r\n<\/pre>\n<h2>Conclusion<\/h2>\n<p>The ISC DHCP daemon is a powerful beast. It can provision about every possible device. If the DHCP options you need are not known by default, they can be declared. The ISC DHCP daemon knows more than the options shown in the examples above, but this is out of the scope of this article. A comprehensive list can be found on the\u00a0<a title=\"DHCPv4 options on IPAM worldwide\" href=\"http:\/\/www.ipamworldwide.com\/ipam\/isc-dhcpv4-options.html\">website of IPAM Worldwide<\/a>.<\/p>\n<h2>References<\/h2>\n<ul>\n<li><a href=\"https:\/\/www.isc.org\/downloads\/dhcp\/\">Internet Software Consortium DHCP website<\/a><\/li>\n<li><a href=\"https:\/\/www.isc.org\/community\/mailing-list\/\">DHCP mailing-lists<\/a><\/li>\n<li><a href=\"http:\/\/www.ipamworldwide.com\/ipam\/dhcp-isc-config.html\">IPAM Worldwide about DHCP<\/a><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Since the early days of DOCSIS, cable modems are provisioned using DHCP, the Dynamic Host Configuration Protocol, to obtain the basic connectivity settings. When the cable modem is powered on, it begins the ranging process with the CMTS. When the ranging process completes, the cable modem starts with the IP provisioning process, which initiates with &hellip;<\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"content-type":"","inline_featured_image":false,"_genesis_block_theme_hide_title":false,"footnotes":""},"categories":[46,51,39,64],"tags":[],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>How to provision a cable modem using the ISC DHCP server - Excentis<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.excentis.com\/blog\/how-to-provision-a-cable-modem-using-the-isc-dhcp-server\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How to provision a cable modem using the ISC DHCP server - Excentis\" \/>\n<meta property=\"og:description\" content=\"Since the early days of DOCSIS, cable modems are provisioned using DHCP, the Dynamic Host Configuration Protocol, to obtain the basic connectivity settings. When the cable modem is powered on, it begins the ranging process with the CMTS. When the ranging process completes, the cable modem starts with the IP provisioning process, which initiates with &hellip;\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.excentis.com\/blog\/how-to-provision-a-cable-modem-using-the-isc-dhcp-server\/\" \/>\n<meta property=\"og:site_name\" content=\"Excentis\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/Excentis\/\" \/>\n<meta property=\"article:published_time\" content=\"2015-02-26T08:11:28+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2022-06-24T06:28:40+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.excentis.com\/wp-content\/uploads\/Excentis-Facebook.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1200\" \/>\n\t<meta property=\"og:image:height\" content=\"630\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Bram\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@excentis\" \/>\n<meta name=\"twitter:site\" content=\"@excentis\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Bram\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"8 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.excentis.com\/blog\/how-to-provision-a-cable-modem-using-the-isc-dhcp-server\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.excentis.com\/blog\/how-to-provision-a-cable-modem-using-the-isc-dhcp-server\/\"},\"author\":{\"name\":\"Bram\",\"@id\":\"https:\/\/www.excentis.com\/#\/schema\/person\/14a2ac99879eb7b7d4c1a8d666b7a119\"},\"headline\":\"How to provision a cable modem using the ISC DHCP server\",\"datePublished\":\"2015-02-26T08:11:28+00:00\",\"dateModified\":\"2022-06-24T06:28:40+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.excentis.com\/blog\/how-to-provision-a-cable-modem-using-the-isc-dhcp-server\/\"},\"wordCount\":1002,\"commentCount\":18,\"publisher\":{\"@id\":\"https:\/\/www.excentis.com\/#organization\"},\"articleSection\":[\"Cable Modem\",\"DHCP\",\"DOCSIS\",\"Provisioning\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/www.excentis.com\/blog\/how-to-provision-a-cable-modem-using-the-isc-dhcp-server\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.excentis.com\/blog\/how-to-provision-a-cable-modem-using-the-isc-dhcp-server\/\",\"url\":\"https:\/\/www.excentis.com\/blog\/how-to-provision-a-cable-modem-using-the-isc-dhcp-server\/\",\"name\":\"How to provision a cable modem using the ISC DHCP server - Excentis\",\"isPartOf\":{\"@id\":\"https:\/\/www.excentis.com\/#website\"},\"datePublished\":\"2015-02-26T08:11:28+00:00\",\"dateModified\":\"2022-06-24T06:28:40+00:00\",\"breadcrumb\":{\"@id\":\"https:\/\/www.excentis.com\/blog\/how-to-provision-a-cable-modem-using-the-isc-dhcp-server\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/www.excentis.com\/blog\/how-to-provision-a-cable-modem-using-the-isc-dhcp-server\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/www.excentis.com\/blog\/how-to-provision-a-cable-modem-using-the-isc-dhcp-server\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/www.excentis.com\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"How to provision a cable modem using the ISC DHCP server\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/www.excentis.com\/#website\",\"url\":\"https:\/\/www.excentis.com\/\",\"name\":\"Excentis\",\"description\":\"\",\"publisher\":{\"@id\":\"https:\/\/www.excentis.com\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/www.excentis.com\/?s={search_term_string}\"},\"query-input\":\"required name=search_term_string\"}],\"inLanguage\":\"en-US\"},{\"@type\":\"Organization\",\"@id\":\"https:\/\/www.excentis.com\/#organization\",\"name\":\"Excentis\",\"url\":\"https:\/\/www.excentis.com\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/www.excentis.com\/#\/schema\/logo\/image\/\",\"url\":\"https:\/\/www.excentis.com\/wp-content\/uploads\/logo_excentis_001_1200dpi_sRGB.png\",\"contentUrl\":\"https:\/\/www.excentis.com\/wp-content\/uploads\/logo_excentis_001_1200dpi_sRGB.png\",\"width\":3237,\"height\":450,\"caption\":\"Excentis\"},\"image\":{\"@id\":\"https:\/\/www.excentis.com\/#\/schema\/logo\/image\/\"},\"sameAs\":[\"https:\/\/www.facebook.com\/Excentis\/\",\"https:\/\/twitter.com\/excentis\",\"https:\/\/www.linkedin.com\/company\/excentis\/\"]},{\"@type\":\"Person\",\"@id\":\"https:\/\/www.excentis.com\/#\/schema\/person\/14a2ac99879eb7b7d4c1a8d666b7a119\",\"name\":\"Bram\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/www.excentis.com\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/secure.gravatar.com\/avatar\/c2703bf3f7122d24e15d1eba9b10077d?s=96&d=mm&r=g\",\"contentUrl\":\"https:\/\/secure.gravatar.com\/avatar\/c2703bf3f7122d24e15d1eba9b10077d?s=96&d=mm&r=g\",\"caption\":\"Bram\"},\"url\":\"https:\/\/www.excentis.com\/author\/excentis_super_admin\/\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"How to provision a cable modem using the ISC DHCP server - Excentis","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.excentis.com\/blog\/how-to-provision-a-cable-modem-using-the-isc-dhcp-server\/","og_locale":"en_US","og_type":"article","og_title":"How to provision a cable modem using the ISC DHCP server - Excentis","og_description":"Since the early days of DOCSIS, cable modems are provisioned using DHCP, the Dynamic Host Configuration Protocol, to obtain the basic connectivity settings. When the cable modem is powered on, it begins the ranging process with the CMTS. When the ranging process completes, the cable modem starts with the IP provisioning process, which initiates with &hellip;","og_url":"https:\/\/www.excentis.com\/blog\/how-to-provision-a-cable-modem-using-the-isc-dhcp-server\/","og_site_name":"Excentis","article_publisher":"https:\/\/www.facebook.com\/Excentis\/","article_published_time":"2015-02-26T08:11:28+00:00","article_modified_time":"2022-06-24T06:28:40+00:00","og_image":[{"width":1200,"height":630,"url":"https:\/\/www.excentis.com\/wp-content\/uploads\/Excentis-Facebook.jpg","type":"image\/jpeg"}],"author":"Bram","twitter_card":"summary_large_image","twitter_creator":"@excentis","twitter_site":"@excentis","twitter_misc":{"Written by":"Bram","Est. reading time":"8 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/www.excentis.com\/blog\/how-to-provision-a-cable-modem-using-the-isc-dhcp-server\/#article","isPartOf":{"@id":"https:\/\/www.excentis.com\/blog\/how-to-provision-a-cable-modem-using-the-isc-dhcp-server\/"},"author":{"name":"Bram","@id":"https:\/\/www.excentis.com\/#\/schema\/person\/14a2ac99879eb7b7d4c1a8d666b7a119"},"headline":"How to provision a cable modem using the ISC DHCP server","datePublished":"2015-02-26T08:11:28+00:00","dateModified":"2022-06-24T06:28:40+00:00","mainEntityOfPage":{"@id":"https:\/\/www.excentis.com\/blog\/how-to-provision-a-cable-modem-using-the-isc-dhcp-server\/"},"wordCount":1002,"commentCount":18,"publisher":{"@id":"https:\/\/www.excentis.com\/#organization"},"articleSection":["Cable Modem","DHCP","DOCSIS","Provisioning"],"inLanguage":"en-US","potentialAction":[{"@type":"CommentAction","name":"Comment","target":["https:\/\/www.excentis.com\/blog\/how-to-provision-a-cable-modem-using-the-isc-dhcp-server\/#respond"]}]},{"@type":"WebPage","@id":"https:\/\/www.excentis.com\/blog\/how-to-provision-a-cable-modem-using-the-isc-dhcp-server\/","url":"https:\/\/www.excentis.com\/blog\/how-to-provision-a-cable-modem-using-the-isc-dhcp-server\/","name":"How to provision a cable modem using the ISC DHCP server - Excentis","isPartOf":{"@id":"https:\/\/www.excentis.com\/#website"},"datePublished":"2015-02-26T08:11:28+00:00","dateModified":"2022-06-24T06:28:40+00:00","breadcrumb":{"@id":"https:\/\/www.excentis.com\/blog\/how-to-provision-a-cable-modem-using-the-isc-dhcp-server\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.excentis.com\/blog\/how-to-provision-a-cable-modem-using-the-isc-dhcp-server\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/www.excentis.com\/blog\/how-to-provision-a-cable-modem-using-the-isc-dhcp-server\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/www.excentis.com\/"},{"@type":"ListItem","position":2,"name":"How to provision a cable modem using the ISC DHCP server"}]},{"@type":"WebSite","@id":"https:\/\/www.excentis.com\/#website","url":"https:\/\/www.excentis.com\/","name":"Excentis","description":"","publisher":{"@id":"https:\/\/www.excentis.com\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/www.excentis.com\/?s={search_term_string}"},"query-input":"required name=search_term_string"}],"inLanguage":"en-US"},{"@type":"Organization","@id":"https:\/\/www.excentis.com\/#organization","name":"Excentis","url":"https:\/\/www.excentis.com\/","logo":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/www.excentis.com\/#\/schema\/logo\/image\/","url":"https:\/\/www.excentis.com\/wp-content\/uploads\/logo_excentis_001_1200dpi_sRGB.png","contentUrl":"https:\/\/www.excentis.com\/wp-content\/uploads\/logo_excentis_001_1200dpi_sRGB.png","width":3237,"height":450,"caption":"Excentis"},"image":{"@id":"https:\/\/www.excentis.com\/#\/schema\/logo\/image\/"},"sameAs":["https:\/\/www.facebook.com\/Excentis\/","https:\/\/twitter.com\/excentis","https:\/\/www.linkedin.com\/company\/excentis\/"]},{"@type":"Person","@id":"https:\/\/www.excentis.com\/#\/schema\/person\/14a2ac99879eb7b7d4c1a8d666b7a119","name":"Bram","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/www.excentis.com\/#\/schema\/person\/image\/","url":"https:\/\/secure.gravatar.com\/avatar\/c2703bf3f7122d24e15d1eba9b10077d?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/c2703bf3f7122d24e15d1eba9b10077d?s=96&d=mm&r=g","caption":"Bram"},"url":"https:\/\/www.excentis.com\/author\/excentis_super_admin\/"}]}},"featured_image_src":null,"featured_image_src_square":null,"author_info":{"display_name":"Bram","author_link":"https:\/\/www.excentis.com\/author\/excentis_super_admin\/"},"_links":{"self":[{"href":"https:\/\/www.excentis.com\/wp-json\/wp\/v2\/posts\/804"}],"collection":[{"href":"https:\/\/www.excentis.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.excentis.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.excentis.com\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/www.excentis.com\/wp-json\/wp\/v2\/comments?post=804"}],"version-history":[{"count":1,"href":"https:\/\/www.excentis.com\/wp-json\/wp\/v2\/posts\/804\/revisions"}],"predecessor-version":[{"id":1954,"href":"https:\/\/www.excentis.com\/wp-json\/wp\/v2\/posts\/804\/revisions\/1954"}],"wp:attachment":[{"href":"https:\/\/www.excentis.com\/wp-json\/wp\/v2\/media?parent=804"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.excentis.com\/wp-json\/wp\/v2\/categories?post=804"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.excentis.com\/wp-json\/wp\/v2\/tags?post=804"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}