Cisco AS5300 - How and which log to enable to see IPCP traffic?

waio76 · ‎10-16-2002

Which log do I have to enable to see IPCP traffic on the cisco AS5300?

(ex. 7E 80 21 01 7D 31 00 0A 03 06 93 A7 1B C1 95 D7 7E)

If possible, can you also list the steps on how to enable the log as well

Thanks

Wai-O Hui

thisisshanky · ‎10-16-2002

You can enable, "debug ppp packet" which will show a low level PPP packet dump.

Be careful to give this debug command, as they produce lot of log outputs, which might hang your router. Consider using it during offpeak hours or when load is less.

Sankar Nair
UC Solutions Architect
Pacific Northwest | CDW
CCIE Collaboration #17135 Emeritus

mljohnson · ‎10-17-2002

"debug ppp packet" won't usually show the packet contents. If you want to see the IP contents, then "debug ip packet" with an access-list to restrict what you are looking for would be best. I don't see a reason to look at the IPCP packets themselves...

mark-obrien · ‎10-19-2002

Hey Wai-O,

Try the command "debug ppp negotiation" to see the ipcp packets.

Mark

waio76 · ‎10-19-2002

First off, thanks everyone for replying.

The reason I am examing the following pkt

7E 80 21 01 7D 31 00 0A 03 06 93 A7 1B C1 95 D7 7E

is because I need to see the special characters being escaped.

(Ex. 7D 31 is 0x11 in hex and is a special char for X0nXoff.

client 0x11 --> 7D 31 --> over the wire -->7D 31 --> 0x11Cisco)

Problem is by the time I examined the pkt, it already is encoded back to 0x11.

The above pkt was obtained from a log file that was sent to me. Does anyone know if this log file is obtainable from the Cisco router or possibly was generated using some other application?

Network General Corp. 1991 - 1992

--------------------------------------------------------------------------------

Name: WIN2K_NEW.PDK, Date: Tue Aug 10 12:17:19 1982

--------------------------------------------------------------------------------

|Async |19.2k |8 |None |2 |1616H |No |No |All |0H |ASCII |None

--------------------------------------------------------------------------------

WIN2K

--------------------------------------------------------------------------------

**** RX-data is UNDERLINED ****

--------------------------------------------------------------------------------

T

--------------------------------------------------------------------------------

1B C1 FC A3 7E 7E 80 21 02 7D 31 00 0A 03 06 93 A7 1B C1 FC A3 7E R 93 A7 1B

--------------------------------------------------------------------------------

13 11 13 11

C1 31 CC 7E 7E 80 21 01 0C 00 0A 03 06 93 A7 1B C1 D3 25 7E 7E 80

-------------------------------------------------------------------------------

....................................................................

mljohnson · ‎10-21-2002

I don't think that this info is available with cisco debug; you would need to use an external analyzer to get the actual packet dump.