Cannot Recv Packet in new routing protocol

[Nicholas Loulloudes]

Hello all,

I am trying to develop a new routing protocol for Ad-Hoc networks, following the OLSR model. 

I have implemented my own protocol's packet headers, and started working on the implementation of a HELLO msg. I see that nodes installed with my protocol can send HELLO msgs, but nodes cannot RECV them. Specifically, I see that the Send() function is invoked, but the Recv() function is not. 

My test scenario are 5 Nodes with Ad-Hoc Wifi which statically placed 10m apart.

Any suggestions on where to start looking to find a solution to this?

Best,

Nicholas.

[Lalith Suresh]

Are you sure you created the socket correctly for your protocol? Try to NS_LOG the Ipv4L3Protocol and the Mac layer as well to follow the travel path of the packets that your protocol is generating.

 

Best,

Nicholas.

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Lalith Suresh

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Instituto Superior Técnico
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[Nicholas Loulloudes]

Hi, thanks for the reply.

How do i log the Mac? Is there a specific directive only for the Mac?

Thnx,
Nicolas

[Lalith Suresh]

On Mon, Jul 4, 2011 at 4:37 PM, Nicholas Loulloudes <loullo...@gmail.com> wrote:

Hi, thanks for the reply.

How do i log the Mac? Is there a specific directive only for the Mac?

If you're on Wifi, you can do something like:

NS_LOG=WifiNetDevice ./waf --run yourscript

Then go further down with the kind of mac you're using (AdhocWifiMac for instance). You can even try probing MacLow.

 

Thnx,
Nicolas

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[Nicholas Loulloudes]

Hi Lalith,

I enabled the following LOG in my test application cpp.

LogComponentEnable("Ipv4L3Protocol", LOG_LEVEL_ALL);

LogComponentEnable("AdhocWifiMac", LOG_LEVEL_ALL);

And the I get something like the following for every node that broadcasts:

Ipv4L3Protocol:Send(0x98e1fa8, 0x98ee290, 10.0.0.3, 10.255.255.255, 17, 0)

Testing address 127.0.0.1 with mask 255.0.0.0

Testing address 10.0.0.3 with mask 255.0.0.0

Ipv4L3Protocol::Send case 2:  subnet directed bcast to 10.0.0.3

Ipv4L3Protocol:BuildHeader(0x98e1fa8, 10.0.0.3, 10.255.255.255, 17, 32, 64, 1)

However, I do not see any Recv() function being invoked.

Any suggestions?

[Nicholas Loulloudes]

Btw,

I forgot to mention that AdHocWiFi log reports the following:

AdHocWiFi::Enqueue(....)

[Nicholas Loulloudes]

Hi Lalith, all

Any suggestions?

Thanks.

[Hemanth]

Print the packet PID in the debug statements and try to log
Ipv4L3Protocol:AdhocWifiMac:MacLow. See if your packet is being sent
by all layers.

[Lalith Suresh]

On Wed, Jul 6, 2011 at 12:22 PM, Nicholas Loulloudes <loullo...@gmail.com> wrote:

Hi Lalith, all

Any suggestions?

Sorry for the delay. Been travelling.

To add to what Hemanth said, see if the ::Receive() methods of all the layers are being called as well. This will tell you if the packet is dropped at any layer for some reason.

 

Thanks.

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[Sérgio Vieira]

hi, which socket port are you using?

2011/7/10 Lalith Suresh <suresh...@gmail.com>

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Sérgio Vieira

Master program in Computer Networks

State University of Ceará (UECE)

[Nicholas Loulloudes]

Hi all, 

Thanks for the replies. I enabled the debug log for all the stack as suggested above. It seems that the problem was packet collision, therefore the recv() method was not invoked.

To solve this, I applied a random jitter before sending the packets to the mac layer and that sorted everything. I can now receive broadcasted packets from all other neighboring nodes.

Thank you for all the help and suggestions.

Best,

Nicholas.