ISP PPPoE dialer connection is flapping with virtual interface

[CSCO12798688]

Dear all,

I am facing issue with PPPoE connection this connection was working from the past 2 month suddenly one day stopped working.

always getting log like bound or unbound dialer 1 interface with virtual interface 1 line protocol up/down

dialer interface no longer able to get any ip address through ipcp, expecting your help.

[Georg Pauwen]

Hello,

under the dialer interface, make sure you have configured:

dialer idle-timeout 0
dialer persistent

Which router and IOS are you using ? Can you post the config ?

[CSCO12798688]

Using 1900

below are the exact configuration

interface Dialer1
 ip address negotiated
 ip accounting output-packets
 ip nbar protocol-discovery
 ip nat outside
 ip virtual-reassembly in
 encapsulation ppp
 ip tcp adjust-mss 1414
 dialer pool 1
 dialer idle-timeout 0
 ppp pap sent-username ***** password *******
 no cdp enable
end
interface GigabitEthernet0/0
 description Outside interface
 no ip address
 duplex auto
 speed auto
 pppoe enable group global
 pppoe-client dial-pool-number 1
end

[Georg Pauwen]

Hello,

try and make the additions below to the configuration of your dialer interface:

interface Dialer1
ip address negotiated
ip accounting output-packets
ip nbar protocol-discovery
ip mtu 1400
ip nat outside
ip virtual-reassembly in
encapsulation ppp
ip tcp adjust-mss 1360
dialer pool 1
dialer idle-timeout 0
dialer persistent
ppp pap sent-username ***** password *******
no cdp enable

That said, the problem might be at a lower level, the physical one possibly. Can you change the cabling ?

[paul driver]

Hello

Can you check for the correct authentication?

debug ppp negotiation 

debug ppp authentication

Also debug the ppoe sessions

debug ppoe events

show ppoe session

Chap

int dialer1

mtu 1492

ip tcp adjust-mms 1452

ppp chap hostname xxxx

ppp chap password xxxxxx

IP route 0.0.0.0 0.0.0.0 dialer1

res

paul