[c-nsp] debugging all incoming traffic on an interface

[Jason Lixfeld]

I'm trying to give a local ILEC an idea on where to look to  
troubleshoot an issue on a bridged DSL circuit.  It terminates  
directly onto a WIC-1ADSL interface in a 2651 on the one side and a  
VLAN on the other side.  Can't pass traffic over it, but the inbound  
packet counters are incrementing on the 2651 side, however I have no  
idea what kind of traffic is actually hitting the interface, nor do I  
know what the source or destination of the traffic is.

My question in all of this is what's the best way to see all the  
traffic coming into this interface?  Attaching a access-list 100  
permit ip any any log-input to the interface and/or subinterface via  
ip access-group didn't show anything - the interface counters  
incremented while the access-list counter didn't.  I can't debug the  
ATM (sub)interface, nor can I configure a SPAN port on an ATM  
(sub)interface.

Anyone know how I might go about this?  I suppose in a worst case  
scenario, I could hook up a DSL modem to the line and plug that into a  
wireshark box, but I'm hoping there's a more localized solution.

Thanks in advance.