问题描述
在 NS2 ..in TCL 文件中，如何计算一条路径中到达无线网络目的地的跳数?
In NS2 ..in TCL file, how can I calculate number of Hops in one path to reach the destination in wireless Network?
我需要你的帮助.
推荐答案
你必须在协议的代码中这样做...
首先我不知道你要使用哪种协议，还好ns2中的协议非常相似...所以我会指导你如何去做.
You must do that in the protocol's codes...
First of all i don't know which protocol you want to use, but fortunately the protocols in ns2 are very similar to each other... So i will c guide you to how to do it.
我将使用 AODV 协议作为示例...
理论上:
I will use AODV protocol as a sample...
In theory :
我们会说当一个 RREQ 数据包到达时，增加当前路由的数据包跳数...
We'll say when a RREQ packet has arrived, increment the packet hop count for current rout...
这是最简单的方法:
This is the simplest way :
现在打开 aodv.cc 例如 /ns-allinone-2.35/ns-2.35/aodv/aodv.cc 和在说:
Now open aodv.cc For example /ns-allinone-2.35/ns-2.35/aodv/aodv.cc and in the lines that says :
// First check if I am the destination ..
if (rq->rq_dst == index) {
在 if (rq->rq_dst == index) { 后点击 Enter 并写入:
Click Enter after if (rq->rq_dst == index) { and write :
printf("Hop_Count_ %d | Packet with uid %d | from %d to %d ",rq->rq->rq_hop_count,ch->uid,ih->saddr(),ih->daddr());
此代码将打印到达目的地的每个数据包的跳数.
This Code will print the hop count for each packet that arrived to the destination.
在终端 cd 中进入您的 ns2 目录并键入 make 并单击 Enter.例如:
In terminal cd into your ns2 directory and type make and click Enter.For example :
$ cd /ns-allinone-2.35/ns-2.35/
$ make
这是最难的方式:
在代码中:
This is the hardest way :
In code :
从你的 ns2 目录打开 aodv_packet.h... 例如 /ns-allinone-2.35/ns-2.35/aodv/aodv_packet.h
Open aodv_packet.h from your ns2 directory... For example /ns-allinone-2.35/ns-2.35/aodv/aodv_packet.h
找到 struct hdr_aodv_request { 并在其中创建一个称为 hop_count_...
Find struct hdr_aodv_request { and create an interget variable in it called hop_count_...
喜欢:struct hdr_aodv_request {int hop_count_;
现在打开/ns-allinone-2.35/ns-2.35/aodv/aodv.cc中的aodv.cc，找到sendRequest(Packet*p) 函数可能看起来像 void AODV::sendRequest(nsaddr_t dst) {...
Now open aodv.cc from /ns-allinone-2.35/ns-2.35/aodv/aodv.cc and find the definition of sendRequest(Packet *p) function that might look like void AODV::sendRequest(nsaddr_t dst) {...
现在在这个函数中你必须看到一些代码，比如:
Now in this function you must see some codes like :
// Fill up some more fields.
rq->rq_type = AODVTYPE_RREQ;
rq->rq_hop_count = 1;
rq->rq_bcast_id = bid++;
rq->rq_dst = dst;
rq->rq_dst_seqno = (rt ? rt->rt_seqno : 0);
rq->rq_src = index;
seqno += 2;
assert((seqno % 2) == 0);
rq->rq_src_seqno = seqno;
rq->rq_timestamp = CURRENT_TIME;
它说的地方 rq->rq_timestamp = CURRENT_TIME; 只需单击 Enter 并编写打击代码:
And where it says rq->rq_timestamp = CURRENT_TIME; just click Enter and write the blow code :
rq->hop_count_ = 0;
现在你需要找到 recvRequest(Packet *p) 的定义，它可能看起来像 void AODV::recvRequest(Packet *p) {...
Now you need to find the definition of recvRequest(Packet *p) that might look like void AODV::recvRequest(Packet *p) {...
在这个函数中找到说:
In this function find the lines that says :
/*
* Can't reply. So forward the Route Request
*/
else {
在 else { 之后点击 Enter 并写入:
After else { click Enter and write :
rq->hop_count_++;
在终端 cd 中进入您的 ns2 目录并键入 make 并单击 Enter.例如:
In terminal cd into your ns2 directory and type make and click Enter.For example :
$ cd /ns-allinone-2.35/ns-2.35/
$ make
现在进行打印，您可以使用我上面写的第一个解决方案.
Now for printing you can use the first solution that i wrote above.
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