{"id":316,"date":"2008-06-13T10:01:35","date_gmt":"2008-06-13T07:01:35","guid":{"rendered":"http:\/\/www.void.gr\/kargig\/blog\/?p=316"},"modified":"2008-06-13T12:09:02","modified_gmt":"2008-06-13T09:09:02","slug":"44mbit-of-multicast-traffic-can-cause-a-lot-more-problems-than-you-might-think","status":"publish","type":"post","link":"https:\/\/www.void.gr\/kargig\/blog\/2008\/06\/13\/44mbit-of-multicast-traffic-can-cause-a-lot-more-problems-than-you-might-think\/","title":{"rendered":"44Mbit of multicast traffic can cause a lot more problems than you might think"},"content":{"rendered":"<p>I was reading my mails today and I bumped into some problems that <a href=\"http:\/\/www.internet2.edu\/\">Internet2<\/a> routers faced a couple of days ago with some <a href=\"http:\/\/en.wikipedia.org\/wiki\/Multicast\">multicast<\/a> traffic sent from a host in France. Apparently the host was sending 44Mbit of traffic to a <a href=\"http:\/\/en.wikipedia.org\/wiki\/IP_Multicast#IP_multicast_addressing_assignments\">multicast group<\/a> and that was more than enough to raise a very high load on some routers and cause problems to some firewalls too. Their solution was to either blacklist the host or to disable SAP listen on their routers.<\/p>\n<p>To read more you can check the thread &#8220;Another SAP Storm?&#8221; from <a href=\"https:\/\/mail.internet2.edu\/wws\/arc\/wg-multicast\/2008-06\/thrd1.html\">wg-multicast@internet2.edu All things related to multicast <\/a>.<\/p>\n<p>The same problem appeared on <a href=\"http:\/\/www.grnet.gr\">GrNET<\/a> routers too, but unfortunately they don&#8217;t have any public archives of their exchanged mails on the problem. The only way to take a look at this problem from the GrNET point of view is to check on the <a href=\"http:\/\/netmon.grnet.gr\/routers.shtml\">GrNET router status<\/a> page, click on the load of some routers and check the spike that appears on Wednesday night in the weekly graph.<\/p>\n<p>Quite interesting&#8230;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>I was reading my mails today and I bumped into some problems that Internet2 routers faced a couple of days ago with some multicast traffic sent from a host in France. Apparently the host was sending 44Mbit of traffic to a multicast group and that was more than enough to raise a very high load [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"ep_exclude_from_search":false,"footnotes":""},"categories":[5,8],"tags":[],"class_list":["post-316","post","type-post","status-publish","format-standard","hentry","category-internet","category-networking"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.3 - aioseo.com -->\n\t<meta name=\"description\" content=\"I was reading my mails today and I bumped into some problems that Internet2 routers faced a couple of days ago with some multicast traffic sent from a host in France. 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