DUP false positive
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描述
The following
```
hping3 -1
```
reports non-existent duplicates packets for `icmp_seq=65200`. This happens at exactly the point when the `icmp_seq` counter rolls over. This does not happen in our testing **_every_** time, but it does happen **_most_** times.
example output log
```
[snip]
len=28 ip=172.30.0.2 ttl=64 id=59018 icmp_seq=65198 rtt=5.8 ms
len=28 ip=172.30.0.2 ttl=64 id=59019 icmp_seq=65199 rtt=5.6 ms
len=28 ip=172.30.0.2 ttl=64 id=59020 icmp_seq=65200 rtt=5.5 ms
len=28 ip=172.30.0.2 ttl=64 id=59021 icmp_seq=65201 rtt=5.4 ms
len=28 ip=172.30.0.2 ttl=64 id=59022 icmp_seq=65202 rtt=5.3 ms
[snip]
len=28 ip=172.30.0.2 ttl=64 id=59354 icmp_seq=65534 rtt=6.9 ms
len=28 ip=172.30.0.2 ttl=64 id=59355 icmp_seq=65535 rtt=6.8 ms
DUP! len=28 ip=172.30.0.2 ttl=64 id=59356 icmp_seq=65200 rtt=45.5 ms
len=28 ip=172.30.0.2 ttl=64 id=59357 icmp_seq=1 rtt=0.0 ms
len=28 ip=172.30.0.2 ttl=64 id=59358 icmp_seq=2 rtt=0.0 ms
len=28 ip=172.30.0.2 ttl=64 id=59359 icmp_seq=3 rtt=0.0 ms
[snip]
```
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