["harsha ss" <harsha.ss@xxxxxxxxxxxxxx>]

  Thanks for the reply,
   Ispent much time in giving the encapsulation filetype for ethereal,
   As you say I am trying to read a file of the following format.
   Ethereal is displaying the unknown hex dump in the third window,the UNKNOWN_ENCAP_PCAP in the column info field some -ve value of the time etc.
   First I want to know what are those values and how to display the values from our file which has been read properly.

The file format which i am trying to read is as follows

  36|  0:00:02|1692496|expr_1  >expr_2  |packet_info_1
 |^M
        10 00 71 00 00 00 42 71 B8 07 09 18 10 93 00 05^M/* some hexdump unlimit
ed */
     37|  0:00:02|1692496|expr1  >expr2   |ipacket_info_2
 |^M
        0C 00 00 00 03 00 10 00 00 FF FF FF^M
     38|  0:00:02|1692503|expr_1  >expr2  |packet-ifo_3
 |^M   /* follows some hex dump */

named as .DEC file.
Any one please please suggest me how to go with this problem
and tell me the ENCAP value suitable to the following format.
   regards
                Harsha