I'm not sure I understand, and perhaps I've not adequately described what
I'm trying to do, so I'll try again using a semi-hypothetical scenario:
(Please keep in mind I'm new to ns!)
Suppose I've got the following topology:
N1 - N2 - N3
And three "different" agents, (A1,A2,A3) which have all been implemented
differently in C++. The basic idea is that I want these agents to
automatically communicate with each other...
In C++ I've written an A1::command() function that will 'send' sends an IP
packet to the A2 agent. When the A2 agent receives this packet, it then
sends a packet back to A1, which then gets returned to A2 (basically a 3-way
handshake). A2 should then automatically send another packet to the A3
agent by creating a packet, and inserting N3's address in the IP header.
(I'm assuming all of my agents and nodes know about the topology)
In TCL I've done this:
------------------------------------
set n1 [$ns node]
set n2 [$ns node]
set n3 [$ns node]
set a1 [new Agent/A1]
set a2 [new Agent/A2]
set a3 [new Agent/A3]
$ns attach-agent $n1 $a1
$ns attach-agent $n2 $a2
$ns attach-agent $n3 $a3
$ns connect $a1 $a2
#$ns connect $a2 $a3 ;# if I do this, the handshake doesn't work
$ns at 0.0 $a1 send
------------------------------------
When I run this, ns gives me this error:
--- Classfier::no-slot{} default handler (tcl/lib/ns-lib.tcl) ---
_o158: no target for slot 3
_o158 type: Classifier/Port
content dump:
classifier _o158
0 offset
0 shift
2147483647 mask
1 slots
slot 0: _o153 (Agent/A3)
---------- Finished standard no-slot{} default handler ----------
Basically I want A3 to look at any or all packets send to N3. How can I
force this?
I'm using ns-2.29 on Mac OS X 10.4.7.
Thanks in advance!
Brad
On 7/2/06 6:10 PM, "Mark Shifrin" <[EMAIL PROTECTED]> wrote:
> no problem with tcp
> you can do attach agent as many time as you want to a single node.
> you must first define it as tcp-source. and then to choose the application
> which runs over this
> tcp, for example i did it with FTP. moreover you can do it for n, within a
> loop
>
> --- Brad Montgomery <[EMAIL PROTECTED]> wrote:
>
>>
>> Hello All,
>>
>> I'm wondering if it's possible to have a single Agent connected to 2 or more
>> other Agents. I have a topology similar to this:
>>
>> N2
>> |
>> N0 -- N1 -- N3 -- N4
>>
>> I have an agents A0, A2, A3 connected to N0, N2, N3 respectively, and I
>> would like A0 to send a packet to A2, which would then in turn send a packet
>> to A3. Is this possible?
>>
>>> From reading the mailing list archives, it seems like this may not be
>> possible, so my second question would be this:
>>
>> Is it possible to attach an agent to a Node, and force that agent's recv
>> function to get executed for every packet that passes through that node?
>> For example: Could N2 send a packet to N4, so that A3's recv function
>> processes that packet before sending it onward.
>>
>> Any help is GREATLY appreciated!
>>
>> Brad
>>
>>
>
>
> enjoy the life -
> Mark
>
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