hi all, i am getting the following error when doing a "make" to incorporate the Nortel diff serv in ns2.1b6. dsPolicy.cc: In method `int Policy::mark(class Packet *)': dsPolicy.cc:532: no match for `ns_addr_tag & >> int' dsPolicy.cc:532: no match for `ns_addr_tag & >> int' make: *** [dsPolicy.o] Error 1 has anyone come across this error earlier???please let me know... thanks Renjish.