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Cisco router will not accept subnet mask
Problem: Cisco router refuses to set the correct subnet mask, complaining about "Bad mask /xx for address y.y.y.y". Both the address and the subnet mask has been double-checked and is valid.
Solution: Enable "`subnet-zero`" under config like this: "`conf t`" "`ip subnet-zero`" "`end`" "`wr`" You should now be able to set the subnet mask.
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