I'm new to all the network field of knowldege, so I hope my question makes sense.
In a scenario of transition from IPv4 to IPv6, let's suppose ALG is implemented. How would an ALG convert the IHL in the header between the two versions? For exemple: if a IPv6 packet is sent to a IPv4-only host, would a ALG replace the IHL with something like the padding found in the option part of an IPv4 or would a ALG simply "discard" the IHL?
Thank you for enlightening me!