Stephen,
there is no concept of IP class in lwIP, and the IP addressing scheme
you mention is a /23; closer to a class-C than a B ;^)
What you describe sounds pretty strange to me too, looks like your
customer is not well versed in networking or doing some tricky stuff.
Either way, you should be able to replicate a problem given the network
configuration, if you don't... there is a high likelihood that they are
not doing things right.
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