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Update readme.eng.md

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@ -185,6 +185,7 @@ add tcp option **MD5 signature**. All of them have their own disadvantages :
Some adapters/switches/drivers enable hardware filtering of rx badsum not allowing it to pass to the OS.
This behavior was observed on a Mediatek MT7621 based device.
Tried to modify mediatek ethernet driver with no luck, likely hardware enforced limitation.
However the device allowed to send badsum packets, problem only existed for passthrough traffic from clients.
* badsum doesn't work if your device is behind NAT which does not pass invalid packets.
Linux NAT by default does not pass them without special setting `sysctl -w net.netfilter.nf_conntrack_checksum=0`
Openwrt sets it from the box, other routers in most cases don't, and its not always possible to change it.