For instance, a printer that had 255.255.255.0 as its subnet mask was receiving only a third of a page to print and would freeze until it's rebooted. It's valid, because it works, but the minute you add a new computer or printer to the network and forget about this /20 bits subnet mask quirk, that newly added device acts super wonky and ends up freezing, crashing and/or dropping out of the network.
Is this common? It's on ipv4 but it also has a turned off option for ipv6 currently, if that matters. The pfSense router forces subnet mask of 255.255.240.0 on a LAN gateway like 9.9.192.1. Obviously I'm lacking some networking knowledge, and I wish somebody could help me understand something fishy I found on a pfSense router in an organization yesterday.
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