#619
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由 lovegg » 2011-08-16 11:21
大家好!我听说IP层最大传输MTU是1500,为什么我在ubuntu 去ping的话,最大只能是1472,如下所示:
coffee-again@coffee-again:/$ ping 192.168.2.1 -s 1472
PING 192.168.2.1 (192.168.2.1) 1472(1500) bytes of data.
1480 bytes from 192.168.2.1: icmp_seq=1 ttl=64 time=1.80 ms
1480 bytes from 192.168.2.1: icmp_seq=2 ttl=64 time=2.28 ms
1480 bytes from 192.168.2.1: icmp_seq=3 ttl=64 time=2.31 ms
1480 bytes from 192.168.2.1: icmp_seq=4 ttl=64 time=2.33 ms
1472后面为什么有个(1500),而后显示结果中却是1480bytes呢?