Class A IP address with a Class C Mask

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    I have a 2514 router with 2 CAT-5 transceivers for the AUI ports that I have been tasked with configuring for a client. On Ethernet 0 (AUI 0), the client is using a class A WAN address with a class A subnetted mask. On Ethernet 1 (AUI 1), they are using a class A LAN private address with a class C subnet mask, 255.255.255.0. When I try to add that IP address/Subnet mask combination, I get an error stating “bad mask /24”.

    How do I add that IP/Mask combination? My command is standard:

    ip address 10.0.0.100 255.255.255.0

    Any help is greatly appreciated.

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