Cisco asa Nat Configuration

[amalmichaelvj]

Hello team,

I am stucked in nat configuration in Cisco ASA.Let me explain my problems someone kindly provide the support.

I have a cisco asa 5515 in my office premise.And we are having airtel as my pimary ISP.Now we are planning for installing microsoft exchange server in our office. Airtel provided me these details

Wan ip	182.71.x.x
Subnet mask	255.255.255.252
gateway	182.71.x.y
dns 1	202.56.a.b
dns 2	202.56.d.f
Lan IP	182.72.z.z /29   (usable ip range from 182.72.z.z to z.k) 5 ip address
Subnet mask	255.255.255.248

Since the public ip adresses given by airtel  WAN and LAN are different subnet how can i nat our real ip 192.168.0.10 of exchange server to 182.72..z.z

kindly provide the support....

[willwetherman]

Hi,

I'm assuming that your Cisco ASA firewall outside interface has been configured with WAN IP and default gateway in range 182.71.x.x/30? if so, you just need to make sure that the ISP is routing the LAN IP address range 182.72.z.z/29 to your ASA outside interface and then you can create static NAT entries as normal. There is no need to assign an IP address from the LAN range to any ASA interface.

Example static NAT config

object network obj-192.168.0.10
 host 192.168.0.10
object network obj-182.72.1.1
 host 182.72.1.1

!

nat (inside,outside) source static obj-192.168.0.10 obj-182.72.1.1