murali Well i m in the same shoe trying to seek information on TCP with WDM and so on. Therefore if you do get the subcribe list will you be kind enough to email it to me. mano Manohar Menon System Engineer FNPP - DECS Subang Hitech Tel : 580 1697 Fax : 580 2003 >>> Murali K Viswanathan <[EMAIL PROTECTED]> 12/11 2:00 AM >>> Hi Group, I am a new member of this group and am a Masters student at Iowa state Univ, working in the field of networking. Could someone let me know what does the TCP standard say about response to frames received in error? 1. Is the packet just discarded? 2. Is a duplicate acknowledgmenet sent for the previous frame? 3. Or maybe it depends on individual implementations? Thanks, Mur Murali K Viswanathan [EMAIL PROTECTED]