{"id":372,"date":"2025-07-23T16:45:54","date_gmt":"2025-07-23T08:45:54","guid":{"rendered":"https:\/\/lovelyping.com\/?p=372"},"modified":"2025-07-23T16:51:38","modified_gmt":"2025-07-23T08:51:38","slug":"f-stack%e5%a6%82%e4%bd%95%e4%bf%ae%e6%94%b9tcp%e8%bf%9e%e6%8e%a5%e7%9a%84mss","status":"publish","type":"post","link":"https:\/\/lovelyping.com\/?p=372","title":{"rendered":"F-Stack\u5982\u4f55\u4fee\u6539TCP\u8fde\u63a5\u7684MSS"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\"> <br>\u672c\u6587\u4ec5\u4ecb\u7ecdF-Stack\u670d\u52a1\u5668\u4f5c\u4e3a\u88ab\u52a8\u63a5\u53d7\u8fde\u63a5\u7684\u4e00\u65b9\u5982\u4f55\u5728\u4e0d\u4fee\u6539\u7a0b\u5e8f\u7684\u524d\u63d0\u4e0b\u5982\u4f55\u76f8\u5bf9\u7b80\u5355\u7684\u4fee\u6539TCP\u5efa\u8fde\u65f6\u7684MSS\u9009\u9879 <br><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">TCP\u6570\u636e\u5305\u5728\u7ecf\u8fc7\u67d0\u4e9b\u7f51\u7edc\u8bbe\u5907\uff08\u5982\u8d1f\u8f7d\u5747\u8861\u7b49\uff09\u65f6\u53ef\u80fd\u4f1a\u88ab\u589e\u52a0\u67d0\u4e9b\u5934\uff08\u5982vlan\u3001gre\u3001ipip\u7b49\uff09\uff0c\u4f46\u662f\u53c8\u6ca1\u6709\u6b63\u786e\u7684\u51cf\u5c0fsyn\u5305\u4e2dMSS\u9009\u9879\u7684\u503c\uff0c\u5bfc\u81f4\u540e\u7eed\u7684\u6570\u636e\u5305\u52a0\u4e0a\u989d\u5916\u7684\u5934\u540e\u53ef\u80fd\u8d85\u8fc71500\u7684MTU\u800c\u65e0\u6cd5\u6b63\u5e38\u6536\u53d1\u5305\uff0c\u6b64\u65f6\u6211\u4eec\u53ef\u80fd\u65e0\u6cd5\u63a7\u5236\u4e2d\u95f4\u94fe\u8def\u7684\u7f51\u7edc\u8bbe\u5907\uff0c\u5c31\u9700\u8981\u4fee\u6539\u5e94\u7528\u670d\u52a1\u5668\u7684MSS\u914d\u7f6e\uff0c\u4f46\u6700\u597d\u4e0a\u8fd8\u662f\u5e94\u8be5\u7531\u4e2d\u95f4\u7f51\u7edc\u8bbe\u5907\u8fdb\u884c\u517c\u5bb9\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">F-Stack-1.21.5(FreeBSD-11.0)<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">FreeBSD-11.0\u7684ipfw\u5de5\u5177\u4e0d\u652f\u6301\u76f4\u63a5\u4fee\u6539tcp\u7684mss\u9009\u9879\u7684\u503c\uff0c\u5fc5\u987b\u8981\u540c\u65f6\u501f\u52a9netgraph(\u5de5\u5177\uff1angctl\uff09\u6765\u5b9e\u73b0\uff0c\u53c2\u8003\u547d\u4ee4\u5982\u4e0b<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\"># \u521b\u5efa tcpmss \u8282\u70b9\u5e76\u5c06\u5176\u8fde\u63a5\u5230 ng_ipfw \u8282\u70b9<br>ff_ngctl mkpeer ipfw: tcpmss 100 msshook<br>\u200b<br># \u8bbe\u7f6emss\u548chook\u51fd\u6570<br># \u8be5\u547d\u4ee4\u4f1a\u62a5\u9519ff_ngctl: recv incoming message: Operation not permitted\uff0c\u5b9e\u9645\u4e3a\u56de\u663e\u7ed3\u679c\u65f6f-stack\u7684ff_ngctl\u5bf9freesbd\u7684ngctl\u7684\u4e00\u4e2a\u517c\u5bb9\u6027\u95ee\u9898\uff0c\u4e0d\u5f71\u54cd\u8bbe\u7f6e\u6548\u679c\uff0c\u4ec5\u5f71\u54cd\u8bbe\u7f6e\u6210\u529f\u540e\u7684\u56de\u663e<br>ff_ngctl msg ipfw:100 config '{ inHook=\"msshook\" outHook=\"msshook\" maxMSS=1440 }'<br>\u200b<br># \u5c06\u6d41\u91cf\u5bfc\u5165 tcpmss \u8282\u70b9<br>ff_ipfw add 300 netgraph 100 tcp from any to any tcpflags syn out via f-stack-0<br>\u200b<br># \u8ba9\u6570\u636e\u5305\u5728\u88ab\u4fee\u6539\u540e\u7ee7\u7eed\u7531 ipfw \u5904\u7406\uff0c \u53ef\u9009\uff0c\u4e5f\u53ef\u4ee5\u914d\u7f6e\u5728config.ini<br>ff_sysctl net.inet.ip.fw.one_pass=0<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"> <br>\u53c2\u8003\uff1a<a href=\"https:\/\/man.freebsd.org\/cgi\/man.cgi?query=ng_tcpmss&amp;apropos=0&amp;sektion=4&amp;manpath=FreeBSD+11.0-RELEASE&amp;arch=default&amp;format=html\">ng_tcpmss man page<\/a> <\/p>\n\n\n\n<h2 class=\"wp-block-heading\">F-Stack-1.22+(FreeBSD-13.0)<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">FreeBSD-13.0\u7684ipfw\u5de5\u5177\u901a\u8fc7pmod\u6a21\u5757\u5f15\u5165\u7684\u65b9\u5f0f\u652f\u6301\u4e86\u76f4\u63a5\u4fee\u6539tcp\u7684mss\u9009\u9879\u503c\u7684\u529f\u80fd\uff0c\u547d\u4ee4\u53c2\u8003\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">ff_ipfw add 1000 tcp-setmss 1440 tcp from any to any tcpflags syn out<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u3010\u6ce8\u610f:\u3011\u76ee\u524d\u9664\u4e86dev\u5206\u652f\u6700\u65b0\u4ee3\u7801\u9ed8\u8ba4\u652f\u6301\u4e86ip_fw_pmod\u6a21\u5757\uff0c\u5176\u4ed6\u5206\u652f\u548crelease\u7248\u672c\u9700\u8981\u5148\u6253\u4e0a\u4e0b\u9762\u8fd9\u4e2apatch\uff0c\u5728F-Stack\u7684ipfw\u5f00\u542fip_fw_pmod\u6a21\u5757\u529f\u80fd:<a href=\"https:\/\/github.com\/F-Stack\/f-stack\/commit\/02563f482abf89c2f92721b0b64d23d06745feb7\">ff_ipfw support ip_fw_pmod and tcpmod for tcp-setmss.<\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">F-Stack\u901a\u7528\u65b9\u5f0f<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u56e0\u4e3aF-Stack\u5e76\u672a\u5b9e\u9645\u5b9e\u73b0\u4fee\u6539\u7f51\u5361MTU\u7684\u529f\u80fd\uff0c\u6240\u4ee5\u53ef\u4ee5\u901a\u8fc7\u4fee\u6539\u7528\u6237\u6001FreeBSD\u534f\u8bae\u6808\u4e2d\u7f51\u5361\u8bbe\u5907MTU\u7684\u64cd\u4f5c\uff0c\u6765\u8fbe\u5230\u51cf\u5c0fmss\u9009\u9879\u7684\u503c\uff08MTU &#8211; 40\uff09\uff0c\u4f46\u7f51\u5361\u5b9e\u9645\u7684MTU\u8fd8\u662f1500\uff0c\u5e76\u6ca1\u6709\u51cf\u5c0f\uff0c\u4ece\u800c\u8fbe\u5230\u4e5f\u53ef\u4ee5\u6b63\u5e38\u6536\u53d1\u8d85\u8fc7\u8bbe\u7f6e\u7684MTU(\u59821480)\u5927\u5c0f\u7684\u5305(\u59821500)\uff0c\u4f46\u8fd9\u91cc\u501f\u52a9\u4e86F-Stack\u7684feature(\u4e0d\u662fbug)\u6765\u5b9e\u73b0\u7684\uff0c\u5e76\u4e0d\u5efa\u8bae\u4f5c\u4e3a\u6807\u51c6\u65b9\u6848\u4f7f\u7528\uff0c\u53c2\u8003\u547d\u4ee4\u5982\u4e0b<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">ff_ifconfig f-stack-0 mtu 1480<\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">Linux\u534f\u8bae\u6808<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">linux\u534f\u8bae\u6808\u5bf9\u6807ipfw\uff0c\u4f7f\u7528iptables\u4fee\u6539mss\u9009\u9879\u503c\u7684\u547d\u4ee4\u53c2\u8003<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">iptables -t mangle -A OUTPUT -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --set-mss 1440<\/pre>\n","protected":false},"excerpt":{"rendered":"<p>\u672c\u6587\u4ec5\u4ecb\u7ecdF-Stack\u670d\u52a1\u5668\u4f5c\u4e3a\u88ab\u52a8\u63a5\u53d7\u8fde\u63a5\u7684\u4e00\u65b9\u5982\u4f55\u5728\u4e0d\u4fee\u6539\u7a0b\u5e8f\u7684\u524d\u63d0\u4e0b\u5982\u4f55\u76f8\u5bf9\u7b80\u5355\u7684\u4fee\u6539TCP\u5efa\u8fde\u65f6\u7684M &hellip; <\/p>\n<p class=\"link-more\"><a href=\"https:\/\/lovelyping.com\/?p=372\" class=\"more-link\">\u7ee7\u7eed\u9605\u8bfb<span class=\"screen-reader-text\">\u201cF-Stack\u5982\u4f55\u4fee\u6539TCP\u8fde\u63a5\u7684MSS\u201d<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16],"tags":[21,36,37],"class_list":["post-372","post","type-post","status-publish","format-standard","hentry","category-f-stack","tag-f-stack","tag-mss","tag-tcp"],"_links":{"self":[{"href":"https:\/\/lovelyping.com\/index.php?rest_route=\/wp\/v2\/posts\/372","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/lovelyping.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/lovelyping.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/lovelyping.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/lovelyping.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=372"}],"version-history":[{"count":2,"href":"https:\/\/lovelyping.com\/index.php?rest_route=\/wp\/v2\/posts\/372\/revisions"}],"predecessor-version":[{"id":374,"href":"https:\/\/lovelyping.com\/index.php?rest_route=\/wp\/v2\/posts\/372\/revisions\/374"}],"wp:attachment":[{"href":"https:\/\/lovelyping.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=372"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/lovelyping.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=372"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/lovelyping.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=372"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}