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A FreeBSD contributor has implemented GRAND (Gratuitous Neighbour Advertisement), a mechanism that addresses an asymmetry in IPv6 Neighbour Discovery where a host can reach its router immediately but the router may not yet know how to reach the host. Under GRAND, the host proactively announces its new IPv6 address so the router already holds a Neighbour Cache entry before any return traffic arrives.
NASA Lewis Research Center's Satellite Networks and Architectures Branch relies almost entirely on NetBSD to test proposed TCP protocol changes, including selective-acknowledgement retransmission and larger initial windows, for both satellite and terrestrial links. Separately, the KAME project used NetBSD as the base for implementing IPv6 and IPsec, with its stack merged into NetBSD-current in June 1999, while Germany's Institute for Media Communication built network access control tools on the OS.
A programming-focused post lists dozens of widely believed but often incorrect assumptions about local area networks, covering NAT behavior, MAC address uniqueness, DHCP configuration, protocol assumptions, and reachability between devices on the same subnet. The list format deliberately states each falsehood as if true, following the popular 'Falsehoods Programmers Believe' meme style used for other technical domains.