
B-62
MAX Administration Guide
Diagnostic Parameters and Commands
Breaking down the raw data
RECV-3:: 19 octets @ 2BEB8C
[0000]: ff 03 c0 21 01 60 00 0f 03 05 c2 23 05 05 06 4e
[0010]: 36 c9 05
LCP Configure Acknowledgment—The device in the following trace will be authenticated
with CHAP. The Magic number is also acknowledged:
XMIT-3:: 19 octets @ 2C2E94
[0000]: ff 03 c0 21 02 60 00 0f 03 05 c2 23 05 05 06 4e
[0010]: 36 c9 05
LCP Configure Reject—MP+, MRU of 1524, MRRU of 1524 and End Point Discriminator.
This rejection shows two things. First, the remote side does not support MP+ or MP, since
MP+ and the MRRU were rejected. This will have to be a PPP connection. Second, since the
MRU of 1524 was rejected, the default of 1500 is assumed. There must be an MRU, so a
rejection of a given value only calls for use of the default value.
After the trace, the device will need to transmit another LCP Configure Request, removing all
the rejected options:
RECV-3:: 29 octets @ 2BF1A4
[0000]: ff 03 c0 21 04 02 00 19 00 04 00 00 01 04 05 f4
[0010]: 11 04 05 f4 13 09 03 00 c0 7b 4c e0 4c
LCP Configure Request—All values that were previously rejected are no longer in the packet:
XMIT-3:: 8 octets @ 2C2E94
[0000]: ff 03 c0 21 01 04 00 04
LCP Configure Acknowledgment:
RECV-3:: 8 octets @ 2BF7BC
[0000]: ff 03 c0 21 02 04 00 04
At this point, since both sides have transmitted LCP Configure Acknowledgments, LCP is up
and the negotiation moves to the authentication phase. The device receives a CHAP challenge
from the remote end:
RECV-3:: 21 octets @ 2BFDD4
[0000]: ff 03 c2 23 01 01 00 11 04 4e 36 c9 5e 63 6c 63
[0010]: 72 34 30 30 30
The device transmits its encrypted user name and password:
XMIT-3:: 36 octets @ 2C2E94
[0000]: ff 03 c2 23 02 01 00 20 10 49 b8 e8 54 76 3c 4a
[0010]: 6f 30 16 4e c0 6b 38 ed b9 4c 26 48 5f 53 65 61
[0020]: 74 74 6c 65
The remote device sends a CHAP Acknowledgment:
RECV-3:: 8 octets @ 2C03EC
[0000]: ff 03 c2 23 03 01 00 04
At this point, the negotiation moves from authentication to negotiation of Network Control
Protocols (NCPs). Lucent Technologies supports Bridging Control Protocol (BCP), IPCP,
IPXCP, and ATCP.
IPCP Configure Request—Van Jacobsen Header Compression, IP address of 1.1.1.1: