wangchen61698 commented on PR #9254:
URL: https://github.com/apache/nuttx/pull/9254#issuecomment-1545227299
> @wangchen61698 any idea why the first package is lost?
>
> Where in my computer when I do similar test to ping my router it increase
from 1400 to 1408:
>
> ```
> $ ping -s 1400 192.168.0.1
> PING 192.168.0.1 (192.168.0.1) 1400(1428) bytes of data.
> 1408 bytes from 192.168.0.1: icmp_seq=1 ttl=64 time=7.85 ms
> 1408 bytes from 192.168.0.1: icmp_seq=2 ttl=64 time=11.4 ms
> 1408 bytes from 192.168.0.1: icmp_seq=3 ttl=64 time=14.7 ms
> 1408 bytes from 192.168.0.1: icmp_seq=4 ttl=64 time=9.66 ms
> 1408 bytes from 192.168.0.1: icmp_seq=5 ttl=64 time=8.99 ms
> 1408 bytes from 192.168.0.1: icmp_seq=6 ttl=64 time=10.8 ms
> 1408 bytes from 192.168.0.1: icmp_seq=7 ttl=64 time=9.17 ms
> 1408 bytes from 192.168.0.1: icmp_seq=8 ttl=64 time=9.22 ms
> 1408 bytes from 192.168.0.1: icmp_seq=9 ttl=64 time=9.19 ms
> ```
>
> Do you know why is it happening?
Because I set the mtu of tap0 is 1300, sim1 sends a package with a payload
length of 1400,its length of the package is beyond the mtu of the tap0,so tap0
could tell sim1 the package is too big and the mtu of the next hop is 1300.so
firtst package is lost. when sim1 receive the reply，it split the next package。
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