{"id":73029,"date":"2020-03-06T14:42:02","date_gmt":"2020-03-06T11:42:02","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/oshibka-v-bind-9-16-privodyashhaya-k-narusheniyu-obrabotki-tcp-soedinenij"},"modified":"2020-03-06T14:42:02","modified_gmt":"2020-03-06T11:42:02","slug":"oshibka-v-bind-9-16-privodyashhaya-k-narusheniyu-obrabotki-tcp-soedinenij","status":"publish","type":"post","link":"https:\/\/prohoster.info\/da\/blog\/news\/oshibka-v-bind-9-16-privodyashhaya-k-narusheniyu-obrabotki-tcp-soedinenij","title":{"rendered":"Fejl i BIND 9.16, der f\u00f8rer til forstyrrelse af TCP-forbindelsesh\u00e5ndteringen","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

I den offentliggjorte tr\u00e5d for to uger siden BIND 9.16.0<\/a><\/noindex> blev der opdaget en alvorlig fejl<\/a><\/noindex>, som f\u00f8rer til udt\u00f8mning af gr\u00e6nsen for antallet af TCP-forbindelser. I BIND 9.16 blev der foresl\u00e5et et nyt netv\u00e6rkssystem, der er omdannet til en asynkron behandlingsmekanisme baseret p\u00e5 biblioteket libuv<\/a><\/noindex>. P\u00e5 grund af en fejl i dette system reduceres t\u00e6lleren for aktive TCP-forbindelser ikke under visse betingelser, hvilket f\u00f8rer til en stigende forskel mellem t\u00e6llerens v\u00e6rdi og det faktiske antal forbindelser. Efter et stykke tid kan v\u00e6rdien af t\u00e6lleren n\u00e5 den fastsatte gr\u00e6nse for klientforbindelser, og nye TCP-anmodninger stopper med at blive accepteret (UDP-anmodninger vil forts\u00e6tte med at blive behandlet). <\/p>\n

Problemet manifesterer sig prim\u00e6rt p\u00e5 servere, der modtager TCP-forbindelser fra klienter p\u00e5 flere netv\u00e6rksgr\u00e6nseflader samtidigt.
\nOpdateringen af BIND 9.16 er endnu ikke udgivet, men der er offentliggjort patch<\/a><\/noindex>. Som en midlertidig l\u00f8sning kan man s\u00e6tte en gr\u00e6nse for antallet af forbindelser (indstillingen tcp-clients) til en meget stor v\u00e6rdi. Udover BIND 9.16 ber\u00f8rer problemet den eksperimentelle version 9.15, begyndende fra udgivelsen 9.15.6, men denne version bruges oprindeligt kun til udvikling og er ikke designet til implementering p\u00e5 produktionsservere.<\/p>\n

<\/a><\/noindex><\/p>\n

Kilde: opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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