Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Announcements

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. If you'd prefer to explore, try our test area to get started. And see here for current known issues.

New Member

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

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

  • Other Network Infrastructure Subjects
5 REPLIES

Re: Cisco AS5300 - How and which log to enable to see IPCP traff

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.

Bronze

Re: Cisco AS5300 - How and which log to enable to see IPCP traff

"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...

Bronze

Re: Cisco AS5300 - How and which log to enable to see IPCP traff

Hey Wai-O,

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

Mark

New Member

Re: Cisco AS5300 - How and which log to enable to see IPCP traff

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

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

|Com Mode |BaudRt|DBt|Parity|StBt|SyncChar|ChrStrip|OtSn|FmAdSl|FmAdr|ChrSet|Levl 2&3 Proto

|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

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

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

Bronze

Re: Cisco AS5300 - How and which log to enable to see IPCP traff

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.

223
Views
0
Helpful
5
Replies