[ns] How to Drop Packets From a Particular Sender

[Teerawat Issariyakul]

Hi Mats,

I agree with you. In fact, function drop(p) will check whether the packet
is in used before dropping it. But the function drop(p) only exists for
an NsObject. Objects not derived from class NsObject may not define this
function.

If you guys would like to use Packet::free(p), you are responsible for
consistency check. Failing to do so may result in errors like
segmentation fault.

Best,
Teerawat

On 3/13/2009, "Mats Folke" <mats.folke at ericsson.com> wrote:

>
>Hi!
>
>Wouldn't it be kind of dangerous to drop the packet using the first method described? The packet would jsut disappear and the logs would not be consistent. I would recommend using the latter method
>
>drop(p)
>
>instead. This makes the logging consistent and almost all objects I've come across where I would like to drop packets have been Connector objects.
>
>Best regards,
>Mats Folke
>
>Teerawat Issariyakul wrote:
>> Hi,
>> 
>> Suppose you have a pointer "p". You can drop the packet by executing
>> 
>> 
>>     Packet::free(p)
>> 
>> Also the packet "*p" can be dropped from within the Connector object
>> by invoking function drop as follows:
>> 
>>     drop(p);
>> 
>> 
>> Note that "drop(p)" is a function of class Connector, and therefore
>> must be invoked from within the scope of class Connector.
>> 
>> I posted how to drop a a packet in the following blog:
>> 
>> http://t-issariyakul.blogspot.com/2009/03/ns2-dropping-packet.html
>> 
>> For more information about Connector and Packet, see Chapters 5 and 8,
>> respectively, in the following book from Springer:
>> 
>> T. Issaraiyakul and E. Hossain, "Introduction to Network Simulator
>> NS2", Springer 2008.
>> http://www.springer.com/engineering/signals/book/978-0-387-71759-3
>> 
>> You may also find the following website useful:
>> http://www.ece.ubc.ca/~teerawat/NS2.htm
>> 
>> On 3/13/2009, "muralikrishna g" <muralikrishna4g at gmail.com> wrote:
>> 
>>> 
>>> Hi to all..
>>> 
>>> i am using ns-2.33, here in my work i have to drop packets from a
>>> particular sender, i am planing to drop packets depending on the
>>> sender node_id 
>>> 
>>> please help me regarding this..
>>> 
>>> by
>>> 
>>> Muralikrishna Gaddam (muralikrishna4g at gmail.com)
>
>
>
>-- 
>Mats Folke, M.Sc., Lic.Eng.
>Research Engineer
>
>Ericsson AB                     Office: +46 10 7171385
>Ericsson Research               Fax: +46 920 99621
>P.O. Box 920                    Mobile: +46 76 1271385
>SE-971 28 Luleå
>Sweden
>