[ns] diffserv question

[nichunsheng@263.net]

hi all,
When I install Nortel diffserv module in ns-2.1b7,
error message indicates off_flags_ in dsred.cc is not declared.

void dsREDQueue::enque(Packet* pkt) {
   int codePt, queue, prec;
   hdr_ip* iph = hdr_ip::access(pkt);
   codePt = iph->prio();	
   int ecn = 0;
   //looking up queue and prec numbers for that codept
   lookupPHBTable(codePt, &queue, &prec);	
    
   // code added for ECN support
hdr_flags* hf = (hdr_flags*)(pkt->access(off_flags_));

I don't know what's the meaning of off_flags_. 
How to declare it?
I tried to declare as following and it can be complied.
Is it right?

int off_flags_;
off_flags_=iph->offset();


thanks a lot

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