ATM over PPP

Answered Question
Oct 8th, 2008

I have configured the below configuration in Cisco 1821 router

interface ATM0/0/0

description : ADSL Link to ISP

no ip address

no ip mroute-cache

no atm ilmi-keepalive

dsl operating-mode auto

pvc 8/35 ----------------- ( i got this information from ISP )

encapsulation aal5mux ppp dialer

pppoe-client dial-pool-number 1

interface Dialer1

ip address negotiated

ip mtu 1492

ip virtual-reassembly

encapsulation ppp

dialer pool 1

dialer-group 1

no cdp enable

ppp authentication pap chap callin

ppp chap hostname fti/bt7u2aw

ppp chap password 0 hp6q64c

ppp pap sent-username fti/bt7u2aw password 0 hp6q64c

end

But the internet link is not coming up

ATM0/0/0 is up, line protocol is up

Hardware is DSLSAR (with Alcatel ADSL Module)

Description: : ADSL Link to ISP

MTU 4470 bytes, sub MTU 4470, BW 320 Kbit, DLY 1600 usec,

reliability 255/255, txload 1/255, rxload 1/255

Encapsulation ATM, loopback not set

Encapsulation(s): AAL5 AAL2, PVC mode

23 maximum active VCs, 256 VCs per VP, 1 current VCCs

VC Auto Creation Disabled.

VC idle disconnect time: 300 seconds

Last input never, output 00:36:00, output hang never

Last clearing of "show interface" counters 00:20:29

Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0

Queueing strategy: Per VC Queueing

5 minute input rate 0 bits/sec, 0 packets/sec

5 minute output rate 0 bits/sec, 0 packets/sec

0 packets input, 0 bytes, 0 no buffer

Received 0 broadcasts, 0 runts, 0 giants, 0 throttles

0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort

0 packets output, 0 bytes, 0 underruns

0 output errors, 0 collisions, 1 interface resets

0 output buffer failures, 0 output buffers swapped out

There is no packet in and Out

please any one help ,me

I have this problem too.
0 votes
Correct Answer by Giuseppe Larosa about 8 years 1 month ago

Hello Thiru,

it is an authentication issue not an encapsulation problem, they probably have auto-sense for detecting PPPoA and PPPoEoA.

Contact your provider support team for checking authentication data you have to use

Hope to help

Giuseppe

  • 1
  • 2
  • 3
  • 4
  • 5
Overall Rating: 3 (1 ratings)
Loading.
Giuseppe Larosa Wed, 10/08/2008 - 12:41

Hello Thiru,

your config is actually a PPPoE over ATM and not PPP over ATM

to troubleshoot

terminal monitor

debug ppp negotiation

debug ppp authentication

int atm0/0/0

shut

no shut

collect the output and post it

PPP over ATM example:

interface ATM0/0

no ip address

no ip mroute-cache

no atm ilmi-keepalive

dsl operating-mode auto

pvc 8/35

encapsulation aal5mux ppp dialer

dialer pool-member 2

!

interface Dialer2

ip address negotiated

ip mtu 1492

ip virtual-reassembly

encapsulation ppp

dialer pool 2

dialer-group 1

no cdp enable

ppp authentication pap chap callin

ppp chap hostname fti/bt7u2aw

ppp chap password 0 hp6q64c

ppp pap sent-username fti/bt7u2aw password 0 hp6q64c

end

Hope to help

Giuseppe

thiru.vel10 Wed, 10/08/2008 - 12:52

Oct 8 20:41:38.910: Vi3 LCP: Timeout: State Listen

Oct 8 20:41:38.910: Vi3 PPP: No remote authentication for call-out

Oct 8 20:41:38.910: Vi3 LCP: O CONFREQ [Listen] id 62 len 10

Oct 8 20:41:38.910: Vi3 LCP: MagicNumber 0x1ECC4D32 (0x05061ECC4D32)

Oct 8 20:41:40.926: Vi3 LCP: Timeout: State REQsent

Oct 8 20:41:40.926: Vi3 LCP: O CONFREQ [REQsent] id 63 len 10

Oct 8 20:41:40.926: Vi3 LCP: MagicNumber 0x1ECC4D32 (0x05061ECC4D32)

Oct 8 20:42:29.086: Vi3 PPP: Authorization required

Oct 8 20:42:29.086: Vi3 PPP: No remote authentication for call-out

Oct 8 20:42:31.130: Vi3 PPP: No authorization without authentication

Oct 8 20:42:31.134: Vi3 CHAP: I CHALLENGE id 253 len 29 from "BSLYO153"

Oct 8 20:42:31.134: Vi3 CHAP: Using hostname from interface CHAP

Oct 8 20:42:31.134: Vi3 CHAP: Using password from interface CHAP

Oct 8 20:42:31.134: Vi3 CHAP: O RESPONSE id 253 len 32 from "fti/bt7u2aw"

Oct 8 20:42:31.342: Vi3 CHAP: I FAILURE id 253 len 21 msg is "permission denie

"

Oct 8 20:42:35.358: Vi3 PPP: Authorization required

Oct 8 20:42:35.358: Vi3 PPP: No remote authentication for call-out

Oct 8 20:43:25.534: Vi3 PPP: Authorization required

Oct 8 20:43:25.534: Vi3 PPP: No remote authentication for call-out

Oct 8 20:44:15.710: Vi3 PPP: Authorization required

Oct 8 20:44:15.710: Vi3 PPP: No remote authentication for call-out

Giuseppe Larosa Wed, 10/08/2008 - 13:02

Hello Thiru,

from your output we can see that PPP negotiation fails during authentication

the remote router "BSLYO153" sends a CHAP challenge

Oct 8 20:42:31.134: Vi3 CHAP: I CHALLENGE id 253 len 29 from "BSLYO153"

your router answers

Oct 8 20:42:31.134: Vi3 CHAP: O RESPONSE id 253 len 32 from "fti/bt7u2aw"

but the answer is not liked by remote

Oct 8 20:42:31.342: Vi3 CHAP: I FAILURE id 253 len 21 msg is "permission denie

"

contact your provider and check authentication data

However, ATM encapsulation is correct

Hope to help

Giuseppe

thiru.vel10 Wed, 10/08/2008 - 13:02

HI Thanks for you response , I have configured the same which you gave . but still i am having the same problem.

Out put

*Oct 8 21:08:08.894: Vi3 LCP: Timeout: State ACKsent

*Oct 8 21:08:08.894: Vi3 LCP: O CONFREQ [ACKsent] id 42 len 10

*Oct 8 21:08:08.894: Vi3 LCP: MagicNumber 0x1EE488F4 (0x05061EE488F4)

*Oct 8 21:08:08.926: Vi3 LCP: I CONFACK [ACKsent] id 42 len 10

*Oct 8 21:08:08.926: Vi3 LCP: MagicNumber 0x1EE488F4 (0x05061EE488F4)

*Oct 8 21:08:08.926: Vi3 LCP: State is Open

*Oct 8 21:08:08.926: Vi3 PPP: No authorization without authentication

*Oct 8 21:08:08.926: Vi3 PPP: Phase is AUTHENTICATING, by the peer

*Oct 8 21:08:08.926: Vi3 CHAP: I CHALLENGE id 184 len 29 from "BSLYO153"

*Oct 8 21:08:08.930: Vi3 CHAP: Using hostname from interface CHAP

*Oct 8 21:08:08.930: Vi3 CHAP: Using password from interface CHAP

*Oct 8 21:08:08.930: Vi3 CHAP: O RESPONSE id 184 len 32 from "fti/bt7u2aw"

*Oct 8 21:08:12.942: Vi3 CHAP: I CHALLENGE id 185 len 29 from "BSLYO153"

*Oct 8 21:08:12.942: Vi3 CHAP: Using hostname from interface CHAP

*Oct 8 21:08:12.942: Vi3 CHAP: Using password from interface CHAP

*Oct 8 21:08:12.942: Vi3 CHAP: O RESPONSE id 185 len 32 from "fti/bt7u2aw"

*Oct 8 21:08:17.046: Vi3 CHAP: I CHALLENGE id 186 len 29 from "BSLYO153"

*Oct 8 21:08:17.050: Vi3 CHAP: Using hostname from interface CHAP

*Oct 8 21:08:17.050: Vi3 CHAP: Using password from interface CHAP

*Oct 8 21:08:17.050: Vi3 CHAP: O RESPONSE id 186 len 32 from "fti/bt7u2aw"

*Oct 8 21:08:17.206: Vi3 CHAP: I FAILURE id 186 len 21 msg is "permission deni

d"

*Oct 8 21:08:17.210: Vi3 LCP: I TERMREQ [Open] id 86 len 4

*Oct 8 21:08:17.210: Vi3 LCP: O TERMACK [Open] id 86 len 4

*Oct 8 21:08:17.210: Vi3 PPP: Sending Acct Event[Down] id[2EE]

*Oct 8 21:08:17.210: Vi3 PPP: Phase is TERMINATING

*Oct 8 21:08:19.198: Vi3 LCP: Timeout: State TERMsent

*Oct 8 21:08:19.198: Vi3 LCP: State is Closed

*Oct 8 21:08:19.198: Vi3 PPP: Phase is DOWN

*Oct 8 21:08:19.198: Vi3 PPP: Phase is ESTABLISHING, Passive Open

*Oct 8 21:08:19.198: Vi3 LCP: State is Listen

*Oct 8 21:08:21.214: Vi3 LCP: Timeout: State Listen

*Oct 8 21:08:21.214: Vi3 PPP: Authorization required

*Oct 8 21:08:21.214: Vi3 PPP: No remote authentication for call-out

*Oct 8 21:08:21.214: Vi3 LCP: O CONFREQ [Listen] id 43 len 10

*Oct 8 21:08:21.214: Vi3 LCP: MagicNumber 0x1EE4C0F6 (0x05061EE4C0F6)

*Oct 8 21:08:23.230: Vi3 LCP: Timeout: State REQsent

*Oct 8 21:08:23.230: Vi3 LCP: O CONFREQ [REQsent] id 44 len 10

*Oct 8 21:08:23.230: Vi3 LCP: MagicNumber 0x1EE4C0F6 (0x05061EE4C0F6)

*Oct 8 21:08:25.246: Vi3 LCP: Timeout: State REQsent

*Oct 8 21:08:25.246: Vi3 LCP: O CONFREQ [REQsent] id 45 len 10

*Oct 8 21:08:25.246: Vi3 LCP: MagicNumber 0x1EE4C0F6 (0x05061EE4C0F6)

*Oct 8 21:08:27.262: Vi3 LCP: Timeout: State REQsent

*Oct 8 21:08:27.262: Vi3 LCP: O CONFREQ [REQsent] id 46 len 10

*Oct 8 21:08:27.262: Vi3 LCP: MagicNumber 0x1EE4C0F6 (0x05061EE4C0F6)

*Oct 8 21:08:29.278: Vi3 LCP: Timeout: State REQsent

*Oct 8 21:08:29.278: Vi3 LCP: O CONFREQ [REQsent] id 47 len 10

*Oct 8 21:08:29.278: Vi3 LCP: MagicNumber 0x1EE4C0F6 (0x05061EE4C0F6)

*Oct 8 21:08:31.294: Vi3 LCP: Timeout: State REQsent

*Oct 8 21:08:31.294: Vi3 LCP: O CONFREQ [REQsent] id 48 len 10

*Oct 8 21:08:31.294: Vi3 LCP: MagicNumber 0x1EE4C0F6 (0x05061EE4C0F6)

*Oct 8 21:08:33.310: Vi3 LCP: Timeout: State REQsent

*Oct 8 21:08:33.310: Vi3 LCP: O CONFREQ [REQsent] id 49 len 10

*Oct 8 21:08:33.310: Vi3 LCP: MagicNumber 0x1EE4C0F6 (0x05061EE4C0F6)

*Oct 8 21:08:35.326: Vi3 LCP: Timeout: State REQsent

*Oct 8 21:08:35.326: Vi3 LCP: O CONFREQ [REQsent] id 50 len 10

*Oct 8 21:08:35.326: Vi3 LCP: MagicNumber 0x1EE4C0F6 (0x05061EE4C0F6)

*Oct 8 21:08:37.342: Vi3 LCP: Timeout: State REQsent

*Oct 8 21:08:37.342: Vi3 LCP: O CONFREQ [REQsent] id 51 len 10

Correct Answer
Giuseppe Larosa Wed, 10/08/2008 - 13:09

Hello Thiru,

it is an authentication issue not an encapsulation problem, they probably have auto-sense for detecting PPPoA and PPPoEoA.

Contact your provider support team for checking authentication data you have to use

Hope to help

Giuseppe

thiru.vel10 Thu, 10/09/2008 - 10:14

Hi.

I request the ISP to reset the our Account password and then I have configured the same in dialer interface now the internet is up and running fine . thanks a lot

Actions

This Discussion