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connecting a BT ADSL router/modem to a CISCO 1720

help or suggestions welcome!

my company has installed a ADSL modem, I have purchased a Cisco 1720 dual ethernet VPN modem, because I can't replace the existing equipment installed I have decided to connect the ADSL router to the Cisco router.

the ADSL installed is No-Nat, the ADSL router has a Public IP address and I have been give a another public address which connects my PC... I assume that the current settings on my PC i.e. IP address, DNS servers, Gateway address etc. need to be put on the CISCO router (which will connect to my Cisco switch) which will allow me to share the Internet Access.

does anyone know the easiet configuration?

I'm new to cisco equipment and have just started learning about the IOS.




Re: connecting a BT ADSL router/modem to a CISCO 1720

Since there has been no response to your post, it appears to be either too complex or too rare an issue for other forum members to assist you. If you don't get a suitable response to your post, you may wish to review our resources at the online Technical Assistance Center ( or speak with a TAC engineer. You can open a TAC case online at

If anyone else in the forum has some advice, please reply to this thread.

Thank you for posting.

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