Do you mean the reserved fields of the TCP/IP4-header?

NetPacket::TCP has already implemented accessors. After decode()-ing the raw packet, you can access the reserved fields by selecting the respective instance data.

Have a look at pack/unpack to further inspect this field.

HTH

In reply to Re: Selecting certain bits from a TCP header by Perlbotics
in thread Selecting certain bits from a TCP header by rspishock

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