to access the routines from the pcap packet capture library.
From libpcap's documentation: Libpcap is a system-independent interface for
user-level packet capture. Libpcap provides a portable framework for
low-level network monitoring. Applications include network statistics
collection, security monitoring, network debugging, etc.
Pcapy is most useful when used together with a packet handling package such
as Impacket, a collection of Python classes for contructing and dissecting
network packets.
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