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I have an NDIS filter driver installed between the network card driver and the protocol driver in the driver stack.
When I receive the next packet from the network card driver (incoming traffic) and after making some changes to it, do I need to calculate a new checksum of the IP header. Whether it is checked after me in the protocol driver or in user mode programs.
In other words, - where the checksum of the IP header in incoming network traffic is checked.
Is it possible any changes in the transport layer header (TCP,UDP,ARP...) when a packet travels between two hosts through routers. (May be because of pseudo checksum)
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