Packet structure

+------------------+
|     Direction    |
|     (1 Octet)    |
+------------------+
| Cisco HDLC frame |
.                  .
.                  .
.                  .

Description

The Direction field is zero if the frame was received by the host that captured the traffic and non-zero if the frame was sent by that host.

The Cisco HDLC frame is as specified by Section 4.3.1 of RFC 1547.