thanks all, I have tried the command -p0 < patch-wimax-prerelease-092206 from the ns-allinone-2.29 directory while the command -p1 <patch-wimax-prerelease-092206 from the ns-2.29 directory, but doesn't work. I have tried the command patch <patch-wimax-prerelease-092206 and appears can't find file to patch at input line 4 perhaps you should have used the -p pr --strip option? the text leading up to this was: diff -Naur ns-2.29-0rg/common/packet.h ns-2.29/common/pachet.h ---ns-2.29-org/common/packet.h +++ ns-2.29/common/packet.h file to patch: I sincerely do not know how to interpret them because I am not very expert of Linux commands . Bye Elena
