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IP header size for ICMP


#1

For some of the packets, we see the header length as the following:

i.e. it is a tuple like (20,20).
What should we do in this case? Thanks


#2

Maybe it is relating to the fact that in addition to the main IP header, the ICMP also includes the IP header of the message that caused the error (which will be another IP packet with potential size of 20).