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When sending an ICMP ECHO reply, the router merely swaps SRC and DST of the IPv4 header of the corresponding request and these changes cancel each other out in checksum calculation. Therefore, with this commit, the router skips updating the IPv4 checksum in this context. Ref #4555
This source-code repository contains genuine low-level OS components and interfaces of Genode. It solely depends on the framework's base API.