PPP: Outbound ieee-st packet dropped, NCP not negotiated

[Erik Boss]

Yesterday I had to configure a Cisco 891F router as an internet access router with PPP authentication.

Behind this router, a firewall will do NAT and routing.

After configuring the PPP on a dialer interface I receive an IP-address, subnetmask and default route.

To be sure I entered a static default route to the dialer interface.

All interfaces, like Ge8, Dialer1 and Virtual-Access2, are up.

The only message I get is Vi2 PPP: Outbound ieee-st packet dropped, NCP not negotiated.

I searched the internet, changed the mtu to 1450, 1400, 1300 with no luck.

My partial config:

interface GigabitEthernet8
description Connection-To-Internet
no ip address
load-interval 30
duplex full
speed auto
pppoe enable group global
pppoe-client dial-pool-number 1
no cdp enable
service-policy output custom-shaper-100000kbps

interface Dialer1
description Customer Traffic PPPoE Connection
mtu 1492
ip address negotiated
encapsulation ppp
dialer pool 1
dialer-group 1
ppp authentication pap chap callin
ppp chap hostname <username>
ppp chap password 7 <password>
ppp ipcp dns request
ppp ipcp mask request
ppp ipcp route default
ppp ipcp address accept
no cdp enable
bridge-group 1

ip route 0.0.0.0 0.0.0.0 Dialer1

dialer-list 1 protocol ip permit

bridge 1 protocol ieee
bridge 1 route ip

Does someone have a solution for this?

Thanks!

Erik

[Georg Pauwen]

Hello,

your dialer interface is in bridge group 1, which effectively makes it a Layer 2 interface. PPPoE requires a Layer 3 interface. 

Is there are specific purpose/need for the bridge group ? Remove the bridge-group 1 from the Dialer 1 interface and check if that makes a difference...

[Erik Boss]

There's no need to use the bridge-group.

In a other forum I saw someone configuring a bridge-group.

I forgot to delete it.

That's why some said you need to have a layer 3 interface.

What does the NCP do then?

I have no remote access to the router now, could I test this in GNS3 or another tool?

[Georg Pauwen]

Hello,

NCP is needed for PPP, it uses Internet Protocol Control Protocol (IPCP) for the Internet Protocol. So basically, IPCP is the NCP (Network Control Protocol) for IP.

You can test GNSS3, here is a link to a video on how to set this up:

https://www.youtube.com/watch?v=oiN_r_PKIKI