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[ns] Question regarding getting packet information

Hi, ns guru:

        I intend to get packet flowid or src address in distinguish between
them.

I use the following methed in enque routine in drop-tail.cc

void DropTail::enque(Packet* p)
{
        if(DEBUG){
                hdr_ip* iph = (hdr_ip*) p->access(off_ip_);
                printf(" flowid=%d, src=%d.%d \n", iph->flowid(),
iph->src()>>8,
iph->src()&0xff);

        }


However, I get the following information when I compiling drop-tail
of my modified version.drop-tail.cc: In method `void

DropTail::enque(class Packet *)':
drop-tail.cc:78: `off_ip_' undeclared (first use this function)

Could anyobe tell me how to solve this problem ?

The infmation of how to get packet information is appreciated.

Thanks

Xudong


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From: "XuDong Wu" <[email protected]>
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Subject: How to get packet's src, dst and flowid ?
Date: Fri, 09 Jun 2000 13:52:03 PDT
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Hi, ns guru:

	I intend to get packet flowid or src address in distinguish between them.

I use the following methed in enque routine in drop-tail.cc

void DropTail::enque(Packet* p)
{
        if(DEBUG){
                hdr_ip* iph = (hdr_ip*) p->access(off_ip_);
          	printf(" flowid=%d, src=%d.%d \n", iph->flowid(), iph->src()>>8,
iph->src()&0xff);

        }


However, I get the following information when I compiling drop-tail
of my modified version.drop-tail.cc: In method `void

DropTail::enque(class Packet *)':
drop-tail.cc:78: `off_ip_' undeclared (first use this function)

Could anyobe tell me how to solve this problem ?

The infmation of how to get packet information is appreciated.

Thanks

Xudong






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