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最近在使用netfilter框架做一些东西,发现获取的ip头部长度竟然大于1500,我以为linux协议栈的原因,经过netfilter以后IP报分组会合并。直到我用了wireshark以后,发现确实有些帧长是大于MTU的。
如图:
1670帧,看MAC帧头部帧长 4209bytes ,IP数据包长度4195bytes 。讲道理既然MAC帧头部里表明了帧长为这么多,那应该这个帧就是以这个长度在以太网中传输的吧。 可是为什么?
业精于勤,荒于嬉;行成于思,毁于随。
http://packetbomb.com/how-can...https://ask.wireshark.org/que...During network transmission, it will never exceed the MTU.
http://packetbomb.com/how-can...
https://ask.wireshark.org/que...
During network transmission, it will never exceed the MTU.