{"id":1965,"date":"2022-04-21T09:14:13","date_gmt":"2022-04-21T13:14:13","guid":{"rendered":"https:\/\/increasec.com\/?p=1965"},"modified":"2022-04-21T09:14:13","modified_gmt":"2022-04-21T13:14:13","slug":"rogue-dhcp-fix","status":"publish","type":"post","link":"https:\/\/increasec.com\/?p=1965","title":{"rendered":"Rogue DHCP fix"},"content":{"rendered":"\n<p>DHCP (Dynamic Host Configuration Protocol) when a device is connected to a network, it shouts for an IP address.  the DHCP server answers with an unused IP address, default gateway and DNS servers.  Ideally.<\/p>\n\n\n\n<p>Problems happen when someone non-technical plugs in a wireless gateway and it responds with IPs and DGW that DON&#8217;T get to the internet, or allow someone to spy on your internet traffic.<\/p>\n\n\n\n<p>Solution:  Managed switches have a function called DHCP Snooping.  The switch looks for DHCP offers and drops those packets.  The network manager can exempt upstream physical ports or IP addresses.<\/p>\n\n\n\n<p>Example from HP 1920 series edge switch<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"584\" height=\"422\" src=\"https:\/\/increasec.com\/wp-content\/uploads\/2022\/04\/image.png\" alt=\"\" class=\"wp-image-1966\" srcset=\"https:\/\/increasec.com\/wp-content\/uploads\/2022\/04\/image.png 584w, https:\/\/increasec.com\/wp-content\/uploads\/2022\/04\/image-300x217.png 300w\" sizes=\"auto, (max-width: 584px) 100vw, 584px\" \/><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>DHCP (Dynamic Host Configuration Protocol) when a device is connected to a network, it shouts for an IP address. the DHCP server answers with an unused IP address, default gateway&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[135,173],"class_list":["post-1965","post","type-post","status-publish","format-standard","hentry","category-uncategorised","tag-network","tag-networking"],"_links":{"self":[{"href":"https:\/\/increasec.com\/index.php?rest_route=\/wp\/v2\/posts\/1965","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/increasec.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/increasec.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/increasec.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/increasec.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1965"}],"version-history":[{"count":1,"href":"https:\/\/increasec.com\/index.php?rest_route=\/wp\/v2\/posts\/1965\/revisions"}],"predecessor-version":[{"id":1967,"href":"https:\/\/increasec.com\/index.php?rest_route=\/wp\/v2\/posts\/1965\/revisions\/1967"}],"wp:attachment":[{"href":"https:\/\/increasec.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1965"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/increasec.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1965"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/increasec.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1965"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}