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New Member

Cisco 827 running PPoE

We have Cisco 827 router running PPoE for ADSL connection which is working fine, but one problem is that whenever the ISP is down or does something, then comes back, the 827 cannot pick up the connection automatically unless you reboot it.

Is there a command to check the line, then reboot the router? Does it depend on dynamic ip or static ip you are using?



  • Other Network Infrastructure Subjects
New Member

Re: Cisco 827 running PPoE


How often does this occur? What I am thinking is, you should setup some sort of syslogging, or if you have a ton of unused ram in the box you can set your "logging buffered X debug"(x=some really high number) and run some debugs:

debug atm error

debug vpdn pppoe-events

debug ppp nego

This might give us some clue as to where the problem is happening. Then before rebooting the router, capture a "sh tech" and look for any wierd figures for input/output packets on any interface, or any other wierdness.

Are you running NAT? If so try a "clear ip nat trans *" before you reload. Also try a "clear int dialerX"(is that what you have terminating the connection?) to see if that helps. You may have to clear the atm interface...who knows...

What version of IOS are you running?


New Member

Re: Cisco 827 running PPoE

Hi, Josh:

The IOS version is 12.1(5) YB4, and total SDRAM is 16M. How often does it occur? Hard to say, no regular time.

It is running at a client site, and it is far from us. Maybe some other time I will go there to try what you suggested.

Thank you very much.


New Member

Re: Cisco 827 running PPoE

Hi Shawn,

Use a show run and see what IOS version you are running. In order to overcome this one we have found it safer to use c820-y6-mz.122-2.XI.bin. If you try an even more up to date version such as XK and above, you'll find that any static routes, including the default, that point to the Dialer interface won't actually work! We've raised a case and Cisco are on to it. This version will retrain as it should do.



Cisco Employee

Re: Cisco 827 running PPoE

First of all, you need to start checking from Layer 1 and up..Means the line is trained up or not and the status of atm interface etc.

You will find step by step information about that at

After that pl. visit following location for step by step troubleshooting for PPPoE on 827.