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Cisco ASA Port Forwarding / DHCP IP Address reservation

Unanswered Question
Oct 19th, 2014
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Hi Everyone,

need help on my installation of ASA 5512-x, my first concern is i'm configuring port forwarding using the public servers module under Configuration>Firewall>Public Servers when i add a Public Server i will indicate the following:

Private Interface : Inside

Private IP address: 192.168.1.x

Private Service: 3389

Public Interface: Outside

Public IP Address: "example:"

Public Service 3380

now my problem is after putting all the information when i click OK it will prompt me this error "The public address cannot be the same as the public interface address". I can use another public IP address but what if i only have one public IP? and what if changing the declared public IP address is not an option? I tried creating Port Forwarding using the static NAT but it just prompt me the same error. Is there any way i can solve this without changing the public IP address?

my second concern is does ASA 5512-x can support DHCP IP address reservation through MAC Address? i've been reading through other forums and it seems that this feature is not supported, i just want to confirm maybe 5512-x can support this "simple feature". Thanks in advance for the reply.   

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Seb Rupik Thu, 11/06/2014 - 07:38
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Hi there,

I can't help you with the ASDM error but what you need can be acheived with NAT and the CLI:



object network rdp_server
host 192.168.1.x


object network rdp_server
 nat (inside,outside) static interface service tcp 3389 3380






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