Need to understand what this command is

I need to understand what this command does, it was on a router that I just picked up and I am familiar with this part of the order.

IP nat inside source static tcp 192.168.5.201 mail_192.168.7 25 203.161.81.22 25-extensible route map

I ask is because the customer has a scanner that sends scanned document via smtp to an off-site mail server which, in turn, sends mail to the user.  Before that, they used an internal e-mail server (. 201). What is mail users can go out and reach their destination.  However, any scanned mail does not work and I'm trying to understand why.  The scanner has an internal ip address, which is 192.168.5.25, the 192.168.5.201 is a mail server that was running and this command seems to be allow e-mail from the mail server (. 201) to send mail to another location through VPN tunnel to our other offices. What I'm trying to understand is the order indicating that the mail de.201 can go to the 192.168.7 network via the 203.161.81.22 port road 25.  If this is true who will stop mail from other devices out via 203.161.81.22 on port 25

Hello jonl711

As you know, do the NAT ports on a Cisco router, add a line for each of them, such as:

IP nat inside source static tcp 192.168.5,201 25 X.X.X.X 25 - card expandable route

Here we ¨nating¨ port 25 to the machine 192.168.5.201 in our network, where XXXX is the our public ip address.

That said, here I explain what each command

access-list 112 refuse host ip 192.168.5.201 192.168.1.0 0.0.0.255

access-list 112 refuse host ip 192.168.5.201 192.168.7.0 0.0.0.255

access ip-list 112 allow a whole

--> Here you can create an access list who deny ip 192.168.5.201 go to 192.168.1.0 and 192.168.7.0

mail_192.168.7 allowed 10 route map

corresponds to the IP 112

--> Here you create a ¨rule¨ to match the access list you created.

IP nat inside source static tcp 192.168.5.201 mail_192.168.7 25 203.161.81.22 25-extensible route map

--> and here you are mapping the IP 192.168.5.201 with port 25 (SMTP) that go outside with the IP 203.161.81.22 with port 25 (SMTP) and get a match with the road map

Best regards and have a nice day

Johnnatan Rodriguez Miranda

If this answer is satisfactory to you, please mark it as response.

Thank you

Tags: Cisco Support

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