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Management IP can't be on the same net as the gateway?

JamesNewton
Beginner
Beginner

Setup our ASA 5505 back in the day, no problem, but this ASA 5506X is killing me. I have 

 

interface Management1/1
management-only
nameif management
security-level 0
ip address 192.168.0.3 255.255.255.0
Firewalls, ASA 5506-X, ASA,

but now it won't let me setup gi 1/1 as any IP on that subnet. "The ip address, 192.168.0.2/255.255.255.0 can not overlap with the subnet of interface management" 

I know on my 5505 I had management and inside on the same ip address. Do I have to configure the inside address first and then not specify an IP for the management port? I was kind of hoping to have that as a totally separate physical RJ-45 port, so it could only be administered on the net if I specifically mechanically plugged in that cable.

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