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Mpd is a netgraph based PPP implementation for FreeBSD. Mpd supports thousands of Sync, Async, PPTP, L2TP, PPPoE, TCP and UDP links in client, server and access concentrator (LAC/PAC/TSA) modes. It is very fast and functional.
... designed with the entire internet in mind. Do take note however that Masscan uses its own custom TCP/IP stack, so anything other than a simple port scan could cause conflict with the local TCP/IP stack unless certain configurations are done.