Static NAT Configuration. SMTP website traffic is not permitted inbound by default. The case in point configuration consists of a SMTP-proxy plan to allow for the inbound SMTP visitors to the two mail servers. The SMTP-proxy policy that handles incoming SMTP website traffic is made up of a static NAT (SNAT) motion to carry out NAT on incoming targeted visitors to the two mail servers from any external interfaces. To see the static NAT motion in the plan:Open the illustration configuration file, with Policy Supervisor.

Open up the SMTP-proxy coverage. The Edit Plan Homes dialog box appears. The SNAT rule in this plan alterations the location IP addresses for inbound visitors from the community IP deal with of each and every server to the private IP address of each server.

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The result of this SNAT action in the SMTP-Proxy plan is:For inbound SMTP website traffic to Mail Server one, alter the vacation spot IP tackle from 203. 113. 25 to 10. 2. twenty five. For inbound SMTP targeted traffic to Mail Server 2, change the desired destination IP handle from 203. 113. 26 to 10. two. 26. The SNAT action handles NAT for visitors that will come in to these servers. But due to the fact the SNAT motion applies only to inbound visitors, we require to use dynamic NAT to translate the supply IP handle for website traffic sent by the mail servers out the external interface.

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To do this, we use dynamic NAT in the insurance policies that handle outbound SMTP targeted visitors. Dynamic NAT Configuration. The default dynamic NAT configuration quickly applies dynamic NAT to all site visitors from a person of the a few personal IP tackle ranges to any external interface. By default, dynamic NAT is enabled for traffic that commences in any RFC 1918-outlined non-public IP deal with range and leaves any external interface. To see the default dynamic NAT configuration, select Network > NAT . Each of these dynamic NAT steps translates visitors from a source to a place . If website traffic matches the source and location in a dynamic NAT motion, dynamic NAT adjustments the supply IP deal with to the key IP address of the destination interface. The impact of the 3rd default dynamic NAT motion 10. . /eight – Any-External on targeted visitors from our mail servers is:For outbound targeted visitors from Mail Server 1, transform the source IP address from 10. one. 25 to 203. 113. 2 For outbound targeted traffic from Mail Server two, alter the resource IP address from ten. one. 26 to 203. 113. 2. But this default behavior is not what we want. We want to change the resource IP deal with for each mail server to match the public IP handle for that server.

What we want to do is this:For outbound site visitors from Mail Server one, modify the supply IP tackle from 10. one. 25 to 203. 113. 25 For outbound targeted traffic from Mail Server 2, change the supply IP tackle from ten. one. 26 to 203. 113. 26. To override the supply IP deal with utilized by the default dynamic NAT action, we generate guidelines to deal with outgoing SMTP website traffic from every single of these servers. In every single coverage, we specify the supply IP tackle to use for dynamic NAT. In the instance, these procedures are SMTP-out-MS1 for targeted visitors from Mail Server 1, and SMTP-out-MS2 for website traffic from Mail Server two. To see the coverage configuration outbound traffic from Mail Server 1:

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Open the SMTP-out-MS1 plan .