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827H ADSL Router

I am using a Cisco 827H router to connect to my ADSL service provider and I have been assigned 8 IP addresses, one of which is the static IP address of my ADSL router. I have mydomainname.com and mail.mydomainname.com registered within my ISP's DNS and they resolve to 2 public IP addresses which are within my assigned IP address range.

I have a Microsoft Exchange 2000 server on the "inside" LAN of my 827H and would like to send and receive SMTP traffic using mail.mydomainname.com.

Using the Cisco Router Web Setup, I have configured the 827H for PAT but this only translates the WAN interface IP address for SMTP traffic. It seems that I can not configure any additional IP address so that any mail.mydomainname.com traffic is permitted and translated to the internal IP address Exchange server within the LAN.

Many thanks for you help in advance.

1 REPLY
Bronze

Re: 827H ADSL Router

Hi Martin,

I think you'll be better off using static nat on the 827 router, I am not sure if the Web Interface allows you to configure static nat, so what you can do is, telnet to this device and configure static NAT. Follow these steps,

Telnet to the router, go to enable mode and then go to the config mode and type the following command

ip nat inside source static i.i.i.i o.o.o.o

where i -> is your inside mail servers ip address

o -> is the IP address that the DNS resolves for mail.yourdomain.com.

you can repeat the above command for your web sever also (if you have one) with i as internal web severs ip and o as outside ip that DNS resolves it to ...

Hope it helps and let me know if you need more details

Aslam.

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