以太网帧最小长度是？

solu

下图的54字节是怎么来的？不是说以太网一个帧最小64（18+46）字节吗？

第二张图又是60字节了，似乎填满了46字节。

solu

看看看看看看， 元芳你怎么看？

ooev

参考http://wiki.wireshark.org/Ethernet

Ethernet packets with less than the minimum 64 bytes for an Ethernet packet (header + user data + FCS) are padded to 64 bytes, which means that if there's less than 64-(14+4) = 46 bytes of user data, extra padding data is added to the packet.

Beware: the minimum Ethernet packet size is commonly mentioned at 64 bytes, which is including the FCS. This can be confusing as the FCS is often not shown by Wireshark, simply because the underlying mechanisms simply don't supply it. (XXX - add a list of system that supply the FCS and the systems that don't?)

solu

回复 3# ooev


    54+4 = 58 ， 也没有64.

ssffzz1

header + user data + FCS

还要加FCS的。

solu

ssffzz1 发表于 2013-04-02 09:00
header + user data + FCS

还要加FCS的。

header : 14
userdata: 40
fcs:4

total: 58

solu

竟然无人知道，CU的大牛太少了

realdreams

OP就一SB.... 第一个回复不都说的很清楚了么》。。。

solu

realdreams 发表于 2013-04-03 10:37
OP就一SB.... 第一个回复不都说的很清楚了么》。。。

那是很清楚？ 你2 ？