Hi all, Just found that ~/tcl/mcast/mftp_rcv.tcl and ~/tcl/mcast/mftp_snd.tcl need to be updated as follows in order to compile well with 'dst_addr_' change !! replace 'dst_' with 'dst_addr_' in mftp_rcv.tcl [lines 44,46,48,57,59] also replace 'dst_' with 'dst_addr_' in mftp_snd.tcl [lines 65,67,70] Hope these changes will be updated in the next ns release !! -- Martin