route traffic

[konn]

Hi,

I am using cisco 1720 router. I have 2 MX record register on public DNS.

When sender send email to my 1st MX record , then traffic will redirect to my mail server A.

When sender send email to my 2nd MX record, then

traffic will redirect to my mail server B.

How can I configure this on the router ?

[thisisshanky]

Are both MX records resolving to two different addresses or same address ?

If they are different, you can put two static nat mappings.

ip nat inside source static tcp 25 25

ip nat inside source static tcp 25 25

[konn]

My router are not using NAT, it uses public IP. So how should I configure ?

[thisisshanky]

So are they still resolved into two public IPs routable to your network by your ISP ?

[konn]

yes

[thisisshanky]

Need more info about your network diagram. Whether Mail servers are configured with the public IPs, or private IPs, if they are behind a firewall etc.

[konn]

I have 2 x mail server A and B configured with private IP located behind two firewall A and B.

My DNS server is hosted by ISP, there are 2 x MX record ( public IP ) which is pointing to both of my firewall.

I am doing a migration for firewall and setup 2 new firewall. I want to configure my cisco 1720 router to redirect the MX traffic to the new firewall, so how can I go about this.