Cisco PPPoE config to External Modem

Posted on 2008-11-02
Last Modified: 2013-12-21
I've looked for quite a while on Exp Exch - but can't seem to find a solution that could solve a problem I'm having with connecting my 1841 to an External Modem using PPPoE.

I can't get the physical interface to use the Dialer interface.

Here is my current config:

The Interface connected to the modem:

interface FastEthernet0/1
 description CCN_Wan$ETH-WAN$
 no ip address
 ip nat outside
 ip virtual-reassembly
 speed 100
 pppoe enable group global
 pppoe-client dial-pool-number 1
 no cdp enable

The Virtual Dialer Interface:

interface Dialer1
 ip address negotiated
 ip mtu 1492
 ip nat outside
 ip virtual-reassembly
 encapsulation ppp
 no ip mroute-cache
 dialer pool 1
 dialer-group 1
 ppp authentication chap pap callin
 ppp chap hostname xxxxxxxxxxxxxxxxxx
 ppp chap password 7 xxxxxxxxxxxxxxxxxx
 ppp pap sent-username xxxxxxxxxxxxxxxxxx password 7 xxxxxxxxxxxxxxxxxx
 ppp ipcp route default

Here are the 2 interfaces in question, under a "show ip interface brief"

FastEthernet0/1            unassigned      YES NVRAM  up                    up
Dialer1                    unassigned      YES NVRAM  up                    up


When I do a "debug ppp auth" and "debug ppp negotiations" - I'm not seeing any sort of status messages on the dialer interface actually trying to communicate via the modem.

If anybody can shed some light on this situation for me, It would be greatly appreciated.

My current IOS for the 1841 is 12.4(13r)T.

Any troubleshooting steps that could be provided would be greatly appreciated.
Question by:usslindstrom
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LVL 79

Accepted Solution

lrmoore earned 500 total points
ID: 22885495
Make sure the modem is setup in bridge mode.


Author Comment

ID: 22886297
Thank you very much for the info.

Unfortunately - I'm stuck on "Make sure..."   lol.      Would you happen to know how I could check something like that?

It's a Fiber Optics modem made specifically for NTT Japan.  It's got a fiber line in, and a lan cable out to the router.
LVL 79

Expert Comment

ID: 22886440
If you put a PC or laptop directly on this lan cable, does it get an IP address? If yes, what IP does it get - a public IP or a private 192.168.x.x ?
Do you have to install a pppoe client on the pc to connect it?


Author Comment

ID: 22916250
**Sorry for the late reply on this** - been extremely busy.

I've set up a PPPoE server using some very good freeware that allowed me to do it.

The Cisco router dialed through using PPPoE without fail, and obtained an IP address that I assigned for it.  I know the router is 100% configured correctly.

However, when I plug into the modem - Nothing.  I did what you suggested, and connected the PC directly to the modem, and still nothing.

Which points in the direction that the line is having some serious issues, and not at all anything from the router on back this way.

Thanks everyone for the help here.  Time to call ol' Mr. ISP.  :)

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