{"id":244,"date":"2013-02-10T20:41:22","date_gmt":"2013-02-10T20:41:22","guid":{"rendered":"http:\/\/www.debianpt.org\/~elmig\/blog\/?p=244"},"modified":"2025-08-19T00:12:36","modified_gmt":"2025-08-18T23:12:36","slug":"packet-filter","status":"publish","type":"post","link":"https:\/\/elmig.debianpt.org\/blog\/?p=244","title":{"rendered":"packet filter"},"content":{"rendered":"<figure style=\"width: 220px\" class=\"wp-caption alignright\"><img loading=\"lazy\" decoding=\"async\" alt=\"syn flood\" src=\"http:\/\/upload.wikimedia.org\/wikipedia\/commons\/thumb\/9\/94\/Tcp_synflood.png\/220px-Tcp_synflood.png\" width=\"220\" height=\"276\" \/><figcaption class=\"wp-caption-text\">syn flood<\/figcaption><\/figure>\n<p><strong>SYN flood<\/strong><\/p>\n<p><a href=\"http:\/\/en.wikipedia.org\/wiki\/SYN_flood\">http:\/\/en.wikipedia.org\/wiki\/SYN_flood<\/a><\/p>\n<p>echo 1 &gt; \/proc\/sys\/net\/ipv4\/tcp_syncookies<\/p>\n<p>&nbsp;<\/p>\n<p><strong>XMAS packet<\/strong><\/p>\n<p><a href=\"http:\/\/en.wikipedia.org\/wiki\/Christmas_tree_packet\">http:\/\/en.wikipedia.org\/wiki\/Christmas_tree_packet<\/a><\/p>\n<p>iptables -A INPUT -p tcp &#8211;tcp-flags ALL ALL -j DROP<\/p>\n<p>&nbsp;<\/p>\n<p><strong>SMURF<\/strong><\/p>\n<p><a href=\"http:\/\/www.nordu.net\/articles\/smurf.html\">http:\/\/www.nordu.net\/articles\/smurf.html<\/a><\/p>\n<p>echo 1 &gt; \/proc\/sys\/net\/ipv4\/icp_echo_ignore_broadcasts<\/p>\n<p>&nbsp;<\/p>\n<p><strong>TCP Null<\/strong><\/p>\n<p><a href=\"http:\/\/lab.gsi.dit.upm.es\/semanticwiki\/index.php\/TCP_Null_Scan\">http:\/\/lab.gsi.dit.upm.es\/semanticwiki\/index.php\/TCP_Null_Scan<\/a><\/p>\n<p>iptables -A INPUT -p tcp &#8211;tcp-flags ALL NONE -j DROP<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>SYN flood http:\/\/en.wikipedia.org\/wiki\/SYN_flood echo 1 &gt; \/proc\/sys\/net\/ipv4\/tcp_syncookies &nbsp; XMAS packet http:\/\/en.wikipedia.org\/wiki\/Christmas_tree_packet iptables -A INPUT -p tcp &#8211;tcp-flags ALL ALL -j DROP &nbsp; SMURF http:\/\/www.nordu.net\/articles\/smurf.html echo 1 &gt; \/proc\/sys\/net\/ipv4\/icp_echo_ignore_broadcasts &nbsp; TCP Null http:\/\/lab.gsi.dit.upm.es\/semanticwiki\/index.php\/TCP_Null_Scan iptables -A INPUT -p tcp &#8211;tcp-flags ALL NONE -j DROP &nbsp; &nbsp; &nbsp;<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[44],"tags":[39,40,7],"class_list":["post-244","post","type-post","status-publish","format-standard","hentry","category-sysadmin","tag-firewall","tag-iptables","tag-linux"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/elmig.debianpt.org\/blog\/index.php?rest_route=\/wp\/v2\/posts\/244","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/elmig.debianpt.org\/blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/elmig.debianpt.org\/blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/elmig.debianpt.org\/blog\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/elmig.debianpt.org\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=244"}],"version-history":[{"count":3,"href":"https:\/\/elmig.debianpt.org\/blog\/index.php?rest_route=\/wp\/v2\/posts\/244\/revisions"}],"predecessor-version":[{"id":364,"href":"https:\/\/elmig.debianpt.org\/blog\/index.php?rest_route=\/wp\/v2\/posts\/244\/revisions\/364"}],"wp:attachment":[{"href":"https:\/\/elmig.debianpt.org\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=244"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/elmig.debianpt.org\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=244"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/elmig.debianpt.org\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=244"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}