本文首发于: https://blog.frytea.com
tcpdump 支持 protocol[x:x] 表达式，用于指定某协议[起始偏移量:数值类型长度],
如指定IP包长度大于100:
tcpdump -i eth0 -n 'ip[2:2] > 100'
捕获tcp目标端口在10000和20000之间的包：
tcpdump -i eth0 -n 'tcp[2:2]>10000' and 'tcp[2:2]<20000'
参考文献
- tcpdump 过滤数据包：https://blog.csdn.net/wolfzhaoshuai/article/details/39992753
- tcpdump指定捕包长度：https://blog.csdn.net/rclijia/article/details/56677324
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Author: Frytea
Title: tcpdump 过滤数据包长度
Link: https://blog.frytea.com/archives/496/
Copyright: This work by TL-Song is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
