[ns] Timer with packet ID
Hello everybody The timer function in NS in Constant Bit Rate(CBR) traffic generation works like this. After every interval it creates a new packet and sends the created packet. For me what i want is, if i have created a packet with sequence number 1, i send that packet and wait for 0.2 seconds to send that same packet again. In the mean time there are other packets created. For e.g a packet with sequence number 2 is created and sent. It has to wait for another 0.3 seconds to be sent again. The question is, is there a way to relate packet sequence number with the time, so that at an instance of the time i can get which packet is to be resent. Is there any examples in NS on that. Thanks Sandoche
[ns] how to simulate UDP server?
hi all, I am trying to simulate UDP server/client application. The client will send the request and the server receives it and send it back to the client and client receives it. When i tried with Agent/UDP? I don't know send the message back to client. One more, the client behaves a source and sink. Please, help me for the same. regards, stp.
[ns] 802.11 dynamic bit rate change
Hi, In real 802.11b and 802.11g wireless cards the bit rate changes dynamically depending on the channel conditions. If the card is working at 54Mbps and is receiving no ACK's from the receiver it will automatically switch to a lower bit rate. Modulations used by lower bit rates are stronger against errors, so the link may improve its performance at a lower speed (at least some packets will arrive). There are some algorithms that rule the bit rate such as the one used by the mad-wifi driver for atheros chips. I would like to simulate this behavior in ns2. I'm new using ns2 and I was not able to find the code which simulates this behaviour, is this feature implemented on ns2? Is anybody else interested on this topic? Thanks, Guillermo
[ns] urgent, plz suggest
Dear all, I am waiting for a response. I am encountering a problem with ns loss models... The problem is: The uniform / Markovian loss model works very well with UDP agent But when I try to use these loss models with DCCP/TCPlike Agent it does not works properly. It gives a lot more loss than expected? Kindly suggest me what to do in this case. This is urgent . Thankyou all in advance. Waiting for your mail. Regards, Ijaz Haider Naqvi Send instant messages to your online friends http://uk.messenger.yahoo.com
[ns] R: 802.11 dynamic bit rate change
Guillermo, ns-2 does not offer native support for such phenomenon. You can have a look at the patch at www.reti.polito.it/fiore which adds realistic propagation and ARF support. Marco Messaggio originale Da: [EMAIL PROTECTED] Data: 11-lug-2006 11.50 AM A: Ns Usersns-users@ISI.EDU Ogg: [ns] 802.11 dynamic bit rate change Hi, In real 802.11b and 802.11g wireless cards the bit rate changes dynamically depending on the channel conditions. If the card is working at 54Mbps and is receiving no ACK's from the receiver it will automatically switch to a lower bit rate. Modulations used by lower bit rates are stronger against errors, so the link may improve its performance at a lower speed (at least some packets will arrive). There are some algorithms that rule the bit rate such as the one used by the mad-wifi driver for atheros chips. I would like to simulate this behavior in ns2. I'm new using ns2 and I was not able to find the code which simulates this behaviour, is this feature implemented on ns2? Is anybody else interested on this topic? Thanks, Guillermo
[ns] ns226 - ns228 differences
Hello everyone, I am running the same simulations of ad-hoc network with ns2.26 and ns2.28 and I get significant differences at delay measurements. Especially when DSR is considered the differences are quite high. Can someone verify these conclusions? Is the implementation of DSR so significantly changed between the two versions? Please I need urgent help Christos
Re: [ns] ns226 - ns228 differences
Hi Christos, Hi all, I noticed also that TCP behaviour is different between the two versions (ns-2.26 ns-2.28). I ran the same simulation on both versions and I noticed that in ns-2.26 there is more dropped packet than in ns-2.28. I do not know if this is a bug in ns-2.26 or not. Has any body an idea about this problem??? Yours, Samer - Original Message - From: Christos Antonopoulos [EMAIL PROTECTED] To: ns-users@ISI.EDU Sent: Tuesday, July 11, 2006 2:44 PM Subject: [ns] ns226 - ns228 differences Hello everyone, I am running the same simulations of ad-hoc network with ns2.26 and ns2.28 and I get significant differences at delay measurements. Especially when DSR is considered the differences are quite high. Can someone verify these conclusions? Is the implementation of DSR so significantly changed between the two versions? Please I need urgent help Christos
Re: [ns] how to simulate UDP server?
hi, thanks for the response. But, i want the flow as client--server--client. So, that i can able to find out the response time for the request. Simplex will be trigger the request and response independently. Is there way to give continous X request of N bytes? ie., parameters for trafficType. regards, stp. On Tue, 11 Jul 2006, ijaz haider naqvi wrote: hi, u can create two simplex links between server and cient and attach UDP agent to both of them.. in this way u can carry out two way communication with UDP Agent. Regards, Ijaz Naqvi S.Thanga Prakash [EMAIL PROTECTED] wrote: hi all, I am trying to simulate UDP server/client application. The client will send the request and the server receives it and send it back to the client and client receives it. When i tried with Agent/UDP? I don't know send the message back to client. One more, the client behaves a source and sink. Please, help me for the same. regards, stp. Send instant messages to your online friends http://uk.messenger.yahoo.com
[ns] TX Range Problem Still not Clear
Hi All, I have been looking for a solution on how to set a TX range for a Base Station that is different (e.g. much larger) from other nodes in the network. Unfortunately all the solutions I have tried (including ones already posted on the this list) will set the same TX range for all nodes including BS. I would really appreciate if any one can help. Regards. A. Barnawi
[ns] DSDV Data recv()
Hi ns-users, I have a question related to the receive function in dsdv.cc If you take a look on the code it does the following: 1- It first checks if the node is the sender (src == myaddr_) 2- Then it checks if the packet received is a routing packet (src != myaddr_) (iph-dport() == ROUTER_PORT) 3- Then it checks if the packet received is a broadcast packet 4- Else the packet is forwarded I wonder where the data packet receive is handled, the case when (iph-daddr() == myaddr_) and the packet is to be transmitted up to the application layer. Your help is greatly appreciated. Thanks
Re: [ns] Changing CBR parameters with TCL scripts
Hi, You can set parameter as follows: set app [new Application/Traffic/CBR] $app set rate_ 64000 ;#kbps $app set packetSize_ 100 ;#bytes You can get more details in ns manual. Regards, Hirantha On Tue, 11 Jul 2006 16:22:22 +0100, lekkie omotayo [EMAIL PROTECTED] wrote: Hi guys, Can anybody show me how I can change the parameters of a CBR traffic using tcl scripts. I mean parameters like: Packet size, time interval. Also, I want the CBR traffic to be duplex transmission. i.e. when a traffic is send to a receiver, I want the receiver to be able to send CBR packets back to the sender at a specified packet size and time. I also need to introduce some signaling to trigger the initiation of the second session. Thnx.
Re: [ns] TX Range Problem Still not Clear
Abdulaziz Barnawi schrieb: I have been looking for a solution on how to set a TX range for a Base Station that is different (e.g. much larger) from other nodes in the network. Unfortunately all the solutions I have tried (including ones already posted on the this list) will set the same TX range for all nodes including BS. If you change the node-config during the creation of nodes (e.g. by setting different antenna gains) you will get different transmission ranges. You can safely assume that the antenna of the BS has a higher gain that that of mobile stations. Daniel.
