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TOPIC: PPP Access & Cisco

PPP Access & Cisco 11 years 5 months ago #8542

  • Ranger24
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Good morning,

I need help (as always :?) with my cisco set-up. I have the following network:

PC --> MODEM --> DSLAM -->CISCO 1841 --> PPP Server

I need the cisco router (with 12.3 ios) to forward PPPoE traffic to the PPP server for authentication.

The PPP server is running a simple PPP access concentrator - RASPPPOE

Can anyone help?



Patience - the last reserve of the any engineer
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Re: PPP Access & Cisco 11 years 5 months ago #8562

  • Chris
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The process of forwarding the required traffic to your internal PPP server is quite simple.

There are basically two different methods you can use to achieve your result. One is by the use of NAT, while the other is with the use of PAM (Port to Application Mapping).

Because the commands required to implement your solution will vary, I'll provide you with links to Cisco's site that will help explain and guide you how each method can be implemented.

Configuring NAT falls under the 'Configuring IP Addressing' chapter found at

Configuring PAM falls under the IOS Security guide/PAM chapter located at

Closing, if you decide to use PAM, you'll be forwarding standard TCP/UDP ports to an internal server which in your case is the PPP server. You should also keep in mind that PAM will optionally allow you to specify an access list number - this is where you define your PPP server, so you should use this option.

Give it a go and let us know if you stumble into any problems. We'd also love to know the solution you end up implementing.

Chris Partsenidis.
Founder & Editor-in-Chief
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