Support packet larger than MTU #104

Job	Run time
Info	4s
x86_64-windows-gnu(win7)	3m 20s
x86_64-macos-none	2m 42s
x86-windows-gnu(win7)	2m 22s
aarch64-macos-none	1m 21s
x86_64-windows-gnu	4m 9s
x86-windows-gnu	3m 38s
aarch64-windows-gnu	3m 45s
x86_64-linux-musl	3m 11s
aarch64-linux-musl	2m 44s
arm-linux-musleabi(cortex_a7)	2m 57s
arm-linux-musleabi(mpcorenovfp)	2m 45s
arm-linux-musleabi(pi_zero_w)	2m 45s
mipsel-linux-musl	2m 52s
mips-linux-musl	2m 43s
	41m 18s

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