{"id":47,"date":"2024-08-03T20:40:49","date_gmt":"2024-08-03T17:40:49","guid":{"rendered":"https:\/\/casp.ru\/?p=47"},"modified":"2024-08-03T20:41:06","modified_gmt":"2024-08-03T17:41:06","slug":"vboxnetflt-dropped-over-sized-packet","status":"publish","type":"post","link":"https:\/\/casp.ru\/?p=47","title":{"rendered":"\u041e\u0448\u0438\u0431\u043a\u0430 VBoxNetFlt: Dropped over-sized packet"},"content":{"rendered":"\n<h1>\u041e\u0448\u0438\u0431\u043a\u0430 VBoxNetFlt: Dropped over-sized packet<\/h1>\n\u0417\u0430\u043f\u0443\u0441\u043a \u0432\u0438\u0440\u0442\u0443\u0430\u043b\u043e\u043a \u0432 virtualbox \u0441 \u0431\u0440\u0438\u0434\u0436\u043e\u0432\u0430\u043d\u044b\u043c \u0438\u043d\u0442\u0435\u0440\u0444\u0435\u0439\u0441\u043e\u043c \u0434\u0435\u043b\u043e \u043e\u0431\u044b\u0447\u043d\u043e\u0435, \u043d\u043e \u0438\u043d\u043e\u0433\u0434\u0430 \u043f\u043e \u043d\u0435\u043f\u043e\u043d\u044f\u0442\u043d\u044b\u043c \u043f\u0440\u0438\u0447\u0438\u043d\u0430\u043c \u043c\u043e\u0436\u0435\u0442 \u0432\u043e\u0437\u043d\u0438\u043a\u0430\u0442\u044c \u0433\u0435\u043c\u043e\u0440\u0440\u043e\u0439. \u0412\u044b\u0433\u043b\u044f\u0434\u0438\u0442 \u043e\u043d \u0441\u043b\u0435\u0434\u0443\u044e\u0449\u0438\u043c \u043e\u0431\u0440\u0430\u0437\u043e\u043c &#8212; \u0432\u0438\u0440\u0442\u0443\u0430\u043b\u043a\u0430 \u043f\u0438\u043d\u0433\u0443\u0435\u0442\u0441\u044f \u043c\u0435\u043b\u043a\u0438\u043c\u0438 \u043f\u0430\u043a\u0435\u0442\u0430\u043c\u0438, \u043d\u043e \u043f\u0435\u0440\u0435\u0441\u0442\u0430\u0435\u0442 \u043e\u0442\u0432\u0435\u0447\u0430\u0442\u044c \u043f\u043e tcp, \u043d\u0435\u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e \u0443\u0441\u0442\u0430\u043d\u043e\u0432\u0438\u0442\u044c ssh \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 \u0438 \u0447\u0442\u043e-\u043b\u0438\u0431\u043e \u0441\u0434\u0435\u043b\u0430\u0442\u044c, \u043f\u0440\u0438 \u044d\u0442\u043e\u043c \u0435\u0441\u043b\u0438 \u0437\u0430\u0439\u0442\u0438 \u0432 \u0442\u0435\u0440\u043c\u0438\u043d\u0430\u043b \u0441\u0430\u043c\u043e\u0439 \u0432\u0438\u0440\u0442\u0443\u0430\u043b\u043a\u0438 \u0442\u043e \u0432 \u043d\u0435\u0439 \u0441\u0435\u0442\u044c \u0435\u0441\u0442\u044c. \u041f\u0435\u0440\u0435\u0437\u0430\u043f\u0443\u0441\u043a \u043f\u043e\u043c\u043e\u0433\u0430\u0435\u0442. \u0412\u044b\u044f\u0441\u043d\u0438\u043b\u043e\u0441\u044c \u0447\u0442\u043e \u0434\u0435\u043b\u043e \u0432 mtu \u0438\u043d\u0442\u0435\u0440\u0444\u0435\u0439\u0441\u043e\u0432. \u0415\u0441\u043b\u0438 \u043d\u0430 \u0432\u0438\u0440\u0442\u0443\u0430\u043b\u043a\u0435 \u0435\u0441\u0442\u044c \u043d\u0435\u0441\u043a\u043e\u043b\u044c\u043a\u043e \u0438\u043d\u0442\u0435\u0440\u0444\u0435\u0439\u0441\u043e\u0432, \u0447\u0430\u0441\u0442\u044c \u0438\u0437 \u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u043d\u0430\u0445\u043e\u0434\u0438\u0442\u0441\u044f \u0432\u043e \u0432\u043d\u0435\u0442\u043d\u0435\u043d\u043d\u0435\u0439 \u0441\u0435\u0442\u0438, \u043a\u043e\u0442\u043e\u0440\u0430\u044f \u043e\u0440\u0433\u0430\u043d\u0438\u0437\u0443\u0435\u0442\u0441\u044f \u043c\u0435\u0436\u0434\u0443 \u0441\u0430\u043c\u0438\u043c\u0438 \u0433\u043e\u0441\u0442\u044f\u043c\u0438 \u0442\u043e \u043d\u0430 \u043d\u0438\u0445 \u043e\u0431\u044f\u0437\u0430\u0442\u0435\u043b\u044c\u043d\u043e \u043d\u0443\u0436\u043d\u043e \u0432\u044b\u0441\u0442\u0430\u0432\u043b\u044f\u0442\u044c mtu \u0440\u0430\u0432\u043d\u043e\u0435 (\u0438\u043b\u0438 \u043c\u0435\u043d\u044c\u0448\u0435) \u0445\u043e\u0441\u0442\u043e\u0432\u043e\u0439 \u043c\u0430\u0448\u0438\u043d\u0435, \u0432 \u043e\u0431\u0449\u0435\u043c \u0441\u043b\u0443\u0447\u0430\u0435 \u0440\u0435\u043a\u043e\u043c\u0435\u043d\u0434\u0443\u0435\u0442\u0441\u044f \u0441\u0442\u0430\u0432\u0438\u0442\u044c 1350, \u043f\u0440\u0438 \u0447\u0435\u043c \u0434\u0435\u043b\u0430\u0442\u044c \u044d\u0442\u043e \u0432\u043d\u0443\u0442\u0440\u0438 \u0441\u0430\u043c\u043e\u0433\u043e \u0433\u043e\u0441\u0442\u044f.\n\n\u041f\u0430\u0440\u0430\u043b\u043b\u0435\u043b\u044c\u043d\u043e \u0441 \u044d\u0442\u0438\u043c \u0435\u0434\u0438\u043d\u0441\u0442\u0432\u0435\u043d\u0430\u044f \u043e\u0448\u0438\u0431\u043a\u0430, \u043a\u043e\u0442\u043e\u0440\u0443\u044e \u043c\u043e\u0436\u043d\u043e \u043d\u0430\u0431\u043b\u044e\u0434\u0430\u0442\u044c \u0432 dmesg, \u043a\u0430\u0436\u0435\u0442\u0441\u044f \u0434\u043e\u0432\u043e\u043b\u044c\u043d\u043e \u0431\u0435\u0437\u043e\u0431\u0438\u0434\u043d\u043e\u0439.\n<pre class=\\\"lang:sh decode:true\\\">[ 1174.036340] VBoxNetFlt: Dropped over-sized packet (1464 bytes) coming from internal network.\n<\/pre>\n&nbsp;\n\n\u0412 \u0442\u0435\u043a\u0443\u0449\u0435\u043c \u0447\u0430\u0441\u0442\u043d\u043e\u043c \u0441\u043b\u0443\u0447\u0430\u0435 \u043e\u0431\u044f\u0437\u0430\u0442\u0435\u043b\u044c\u043d\u044b\u043c \u0443\u0441\u043b\u043e\u0432\u0438\u0435\u043c \u0431\u044b\u043b\u043e \u043f\u043e\u043b\u0443\u0447\u0435\u043d\u0438\u0435 \u0430\u0434\u0440\u0435\u0441\u0430 \u043f\u043e dhcp &#8212; \u0438 \u043f\u0430\u0440\u0430\u043c\u0435\u0442\u0440 mtu \u0432 \u043a\u043e\u043d\u0444\u0438\u0433\u0435 \u0438\u043d\u0442\u0435\u0440\u0444\u0435\u0439\u0441\u043e\u0432 \u043d\u0430 \u0434\u0435\u043b\u0435 \u043d\u0435 \u043c\u043e\u0436\u0435\u0442 \u043f\u0435\u0440\u0435\u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0438\u0442\u044c \u043f\u0430\u0440\u0430\u043c\u0435\u0442\u0440 \u043a\u043e\u0442\u043e\u0440\u044b\u0439 debian \u0441\u0447\u0438\u0442\u0430\u0435\u0442 \u043e\u043f\u0442\u0438\u043c\u0430\u043b\u044c\u043d\u044b\u043c &#8212; mtu 1500. \u0427\u0442\u043e\u0431\u044b \u044d\u0442\u043e \u0441\u0434\u0435\u043b\u0430\u0442\u044c \u043d\u0443\u0436\u043d\u043e \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c post-up :\n<pre class=\\\"lang:sh decode:true\\\">cat \/etc\/network\/interfaces\nallow-hotplug eth0\niface eth0 inet dhcp\npost-up ifconfig $IFACE mtu 1350 up<\/pre>\n\u0427\u0442\u043e\u0431\u044b \u043f\u0440\u043e\u0432\u0435\u0440\u0438\u0442\u044c \u043a\u0430\u043a\u043e\u0439 mtu \u0432 \u043f\u0440\u0438\u043d\u0446\u0438\u043f\u0435 \u0432\u043e\u0437\u043c\u043e\u0436\u0435\u043d \u043c\u043e\u0436\u043d\u043e \u0432\u043e\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c\u0441\u044f \u043f\u0440\u043e\u0441\u0442\u044b\u043c \u043f\u0438\u043d\u0433\u043e\u043c, \u0441 \u0440\u0443\u0447\u043d\u044b\u043c \u0443\u043a\u0430\u0437\u0430\u043d\u0438\u0435\u043c mtu \u0438\u0437 \u043a\u043e\u0442\u043e\u0440\u043e\u0433\u043e \u0432\u044b\u0447\u0438\u0442\u0430\u0435\u043c \u0434\u043b\u0438\u043d\u0443 \u0437\u0430\u0433\u043e\u043b\u043e\u0432\u043a\u043e\u043c IP + ICMP\n<pre class=\\\"lang:sh decode:true \\\">ping -c 1 -s $((1350-28)) -M do www.debian.org<\/pre>\n&nbsp;\n\n\u0418 \u043d\u0430\u043f\u043e\u0441\u043b\u0435\u0434\u043e\u043a:\n\u0438\u043d\u0442\u0435\u0440\u0435\u0441\u043d\u0430\u044f \u0442\u0430\u0431\u043b\u0438\u0446\u0430 \u043e\u043f\u0442\u0438\u043c\u0430\u043b\u044c\u043d\u044b\u0445 mtu \u0434\u043b\u044f debian \u0441 \u0441\u0430\u0439\u0442\u0430 debian\n\nhttps:\/\/www.debian.org\/doc\/manuals\/debian-reference\/ch05.en.html#_finding_optimal_mtu\n<pre class=\\\"theme:sublime-text float-enable:true lang:sh decode:true  \\\">Table 5.18. Basic guide lines of the optimal MTU value\nnetwork environment   MTU                                       rationale\nDial-up link          (IP: PPP)                                 576 standard\nEthernet link         (IP: DHCP or fixed)                       1500 standard and default\nEthernet link         (IP: PPPoE)                               1492 (=1500-8) 2 bytes for PPP header and 6 bytes for PPPoE header\nEthernet link         (ISP\\'s backbone: ATM, IP: DHCP or fixed)  1462 (=48*31-18-8) author\\'s speculation: 18 bytes for Ethernet header, 8 bytes for SAR trailer\nEthernet link         (ISP\\'s backbone: ATM, IP: PPPoE)          1454 (=48*31-8-18-8) see \\\"Optimal MTU configuration for PPPoE ADSL Connections\\\" for rationale<\/pre>\n&nbsp;\n","protected":false},"excerpt":{"rendered":"<p>\u041e\u0448\u0438\u0431\u043a\u0430 VBoxNetFlt: Dropped over-sized packet \u0417\u0430\u043f\u0443\u0441\u043a \u0432\u0438\u0440\u0442\u0443\u0430\u043b\u043e\u043a \u0432 virtualbox \u0441 \u0431\u0440\u0438\u0434\u0436\u043e\u0432\u0430\u043d\u044b\u043c \u0438\u043d\u0442\u0435\u0440\u0444\u0435\u0439\u0441\u043e\u043c \u0434\u0435\u043b\u043e \u043e\u0431\u044b\u0447\u043d\u043e\u0435, \u043d\u043e \u0438\u043d\u043e\u0433\u0434\u0430 \u043f\u043e \u043d\u0435\u043f\u043e\u043d\u044f\u0442\u043d\u044b\u043c \u043f\u0440\u0438\u0447\u0438\u043d\u0430\u043c \u043c\u043e\u0436\u0435\u0442 \u0432\u043e\u0437\u043d\u0438\u043a\u0430\u0442\u044c \u0433\u0435\u043c\u043e\u0440\u0440\u043e\u0439. \u0412\u044b\u0433\u043b\u044f\u0434\u0438\u0442 \u043e\u043d \u0441\u043b\u0435\u0434\u0443\u044e\u0449\u0438\u043c \u043e\u0431\u0440\u0430\u0437\u043e\u043c &#8212; \u0432\u0438\u0440\u0442\u0443\u0430\u043b\u043a\u0430 \u043f\u0438\u043d\u0433\u0443\u0435\u0442\u0441\u044f \u043c\u0435\u043b\u043a\u0438\u043c\u0438 \u043f\u0430\u043a\u0435\u0442\u0430\u043c\u0438, \u043d\u043e \u043f\u0435\u0440\u0435\u0441\u0442\u0430\u0435\u0442 \u043e\u0442\u0432\u0435\u0447\u0430\u0442\u044c \u043f\u043e tcp, \u043d\u0435\u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e \u0443\u0441\u0442\u0430\u043d\u043e\u0432\u0438\u0442\u044c ssh \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435<\/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":[],"class_list":["post-47","post","type-post","status-publish","format-standard","hentry","category-1","entry"],"_links":{"self":[{"href":"https:\/\/casp.ru\/index.php?rest_route=\/wp\/v2\/posts\/47","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/casp.ru\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/casp.ru\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/casp.ru\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/casp.ru\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=47"}],"version-history":[{"count":1,"href":"https:\/\/casp.ru\/index.php?rest_route=\/wp\/v2\/posts\/47\/revisions"}],"predecessor-version":[{"id":48,"href":"https:\/\/casp.ru\/index.php?rest_route=\/wp\/v2\/posts\/47\/revisions\/48"}],"wp:attachment":[{"href":"https:\/\/casp.ru\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=47"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/casp.ru\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=47"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/casp.ru\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=47"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}