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@darthnull Oh, I see, a subnet mask bitmap with non-contiguous 1s - that makes sense.Gross.

So something like 192.168.90.256/192.255.148.45, not just a wall of 1s.

(I know enough to set subnet masks on weird ancient gear ;), but I almost always am setting 255.255.255.0 and 255.255.255.255 because /24s rule everything around me. But yeah - reasonable)

I just don't know if I have any gear that would parse subnet masks like that enough to confuse it.