ATM errors

Unanswered Question
May 10th, 2007

Hi everyone could someone tell me what this error means?

dslsar_ng_transmit_pak_wrapper: deq(474C0A84). ATM vcd=1 Transmit VCD=1

dslsar_ng_transmit_pak_wrapper : encap = Data

I'm using IP over ATM, with simple configuration like that -

interface ATM0/0/0

description MTU-intel

ip address 62.118.209.xxy

no atm ilmi-keepalive

dsl operating-mode auto

pvc 1/50

protocol ip 62.118.209.xxy broadcast

protocol ip 62.118.209.xxz broadcast

encapsulation aal5snap


And I can't ping interface itself, I can only have connectiviy from my other network which is attached to FA0/0 interface with routable internet address.

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Overall Rating: 3.8 (11 ratings)
Paolo Bevilacqua Thu, 05/10/2007 - 12:32


which router and interface ? Which IOS ?

you should try a point-to-point subinterface:

int atm ATM0/0/0

no ip address

no pvc 1/150

pvc 1/16 ilmi

int atm ATM0/0/0.150 point-to-point

ip address ...

pvc 1/50

encapsulation aal5snap

Check pvc status with show atm pvc and try to ping interface itself again.

Hope this helps, please rate post if it does!

nikolay-shopik Thu, 05/10/2007 - 21:18


I'm running on cisco 2811 with 12.4(11)XJ3 IOS and HWIC-1ADSL.

my ISP assign me a /28 network, on ATM interface I have addresses from different network, on FA0/0 I have my /28 network. So its looks like


I'll try your suggestion but I suppose this will brake my routing, anyway I will post if it succeseful or not.

Paolo Bevilacqua Fri, 05/11/2007 - 04:03

No it will not break routing. ISP will not even notice the change that is just a logical one.

The /30 is on ADSL / ATM subinterface, and /28 on fastethernet. Absolutely clean and correct.

nikolay-shopik Sun, 05/13/2007 - 03:49

I see no difference at all after change to this configuration. Still can't ping interface from router itself only if I change ping source and put FA0 interface as source our ping outside.

And I can't initiate any connections from ATM interface at all.

Paolo Bevilacqua Sun, 05/13/2007 - 04:13

The symptoms you describe "ping works only with source fa0" says that the ATM is working but there is a routing problem.

Does the ISP assigns you an address for ATM ?

You said you took the address from different network, which network ?

Since you can ping with FA0 address, also the PCs connected should be working, have you verified that ? Have you set a default route pointing to atm0/0/0.150 or to IP address ?

nikolay-shopik Sun, 05/13/2007 - 04:58

ISP assign /30 network one IP on ISP ATM and one IP on my ATM.

Routing working just fine, I'm writing this message when I behind this router.

I just wonder why I can't ping interface itself and can't initiate connections from this interface at all.

Paolo Bevilacqua Sun, 05/13/2007 - 05:07

Because your source address is one that the ISP does not route you back.

Hence my question from were did you picked the address put on atm0/0/0.150.

Do you still see errors?

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nikolay-shopik Sun, 05/13/2007 - 05:17

You maybe misunderstood me, let me explain little more.

We had cisco 678 which is ISP provided hardware now we are move to our hardware.

/30 network with addresses taken from 678 router config plus our /28 network.

Paolo Bevilacqua Sun, 05/13/2007 - 05:24


so the address on ATM are valid and assigned by ISP.

Perhaps they set access list so that you can't do anything with these addresses. After all, you are not supposed to, as the addresses actually assigned to you are the LAN ones.

Were you able to ping or connected from these addresses when using the 678 ?

If you want to be able to ping or originate connections from it, ask your ISP if possible.

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nikolay-shopik Sun, 05/13/2007 - 05:40

Well looks like ISP something messup with this routing but maybe its behaviour by design.

2 1 ms 1 ms 1 ms (my net)

3 * * * Request timed out.

4 30 ms 16 ms 33 ms

5 32 ms 32 ms 33 ms

6 reports: Destination host unreachable.

addres on my atm interface should be reachaeble right after second hope but it goes even deeper and get unreachebles.

Anyway i suppose this is limit ISP limitation. Errors didn't gone also but they didn't broke anything as I see.

Paolo Bevilacqua Sun, 05/13/2007 - 06:00

Perhaps they simply changed the address without telling, when you traceroute to the address supposed to be on the other side of ATM, and it continues, for sure the address is not configured there.

How often are you seeing the errors? What IOS are you using ?

nikolay-shopik Sun, 05/13/2007 - 06:07

I can traceroute address on other side of atm just fine:

2 1 ms 1 ms 1 ms

3 * * * Request timed out.

4 15 ms 16 ms 16 ms

5 31 ms 31 ms 30 ms 62.118.209.xxz

Look for third message in this topic for IOS version I'm running.

Paolo Bevilacqua Sun, 05/13/2007 - 07:33


can you do a sanity check on xxz and xxy to see if they fall correctly in the /30 ? What if you traceroute to both addresses for outside using a public server ?

There is something strange, as you can traceroute other side address but not your own from inside.

ISP-set access list can confuse things, but in general if you can ping from another subnet, you must be able to do same from inside.

nikolay-shopik Sun, 05/13/2007 - 12:46


I can ping ISP_ATM interface just fine from outside of my network, but not mine.

Yeah I also agree about that, what I MUST able ping my own interface at least.

nikolay-shopik Sun, 05/13/2007 - 14:02

Until this evening I have no NAT at all. all nat was done by MSISA server before.

nikolay-shopik Sun, 05/13/2007 - 23:09

Also there new error start appearing ;)

*May 14 11:07:31.409: ASSERTION FAILED: file "../les/if_ng_dslsar_tx.c", line 2969

*May 14 11:07:31.409: ASSERTION FAILED: file "../les/if_ng_dslsar_atm.c", line 692

But it works fine

Paolo Bevilacqua Mon, 05/14/2007 - 04:36

The more you observe a router, the more strange things you will find. I found this always true since started working with them some 13 years now.

Sometime the observations goes to a competent person in the TAC or other cisco dept, and a bug gets filed. Unfortunately, many times, that does not happen.

nikolay-shopik Mon, 05/14/2007 - 10:10

Yeah absolutely true. Unfortunately I don't have any access to TAC, so this is going to be unresolved.

Maybe I'll try install more stable version of IOS and see if it helps me.

Paolo Bevilacqua Mon, 05/14/2007 - 10:28

That's why I suggest always to get a support contract, that can cost as little as eur 150 per year, and the tac will help you on any issue plus it the router or any card that you have in it fail, they will replace as necessary.

nikolay-shopik Tue, 05/15/2007 - 04:23

Thanks man! Could you point me on page where I can read more about support contracts.

Paolo Bevilacqua Tue, 05/15/2007 - 04:26

The pages are on CCO but the prices are not. For this I suggest you contact your cisco reseller. I can also provide quotes if given the router model.

nikolay-shopik Tue, 05/15/2007 - 04:33

I'll be very appreciate, for 2811. I suppose higher level contract include support for all lower models.

Paolo Bevilacqua Tue, 05/15/2007 - 04:44

Actually contracts do not "include". Once you get the support contract, you have to activate it for a single device that falls in the category of the contract, and it will be valid for replacement and case opening, for that device only.

Software download access is not related to the category of contract you purchased or device registered.

If you want a commercial quote please email me to the address given in my profile including all your business details.


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