Networking/Discussion/Technology/Ethernet mutlicast/List of Posts
 
Forum Topic - Ethernet mutlicast: (9 Items)
   
Update
Veniamin Afanasev(deleted)
02/05/2014 2:46 AM
post108604
Ethernet mutlicast   
Hello! How can i take and send packets with ethernet multicast mac adress and send them to my programm or send them from
 my programm. packet format is: dst multicast mac adress+ src multicast mac adress + data + crc.
Thanks.
Nick Reilly
02/05/2014 8:31 AM
post108611
Re: Ethernet mutlicast   
Probably the easiest and best documented way is to use BPF to send and receive the packets. There is a little overhead 
with this method so if you are looking for higher performance there are other methods including writing your own 
protocol lsm, but this is more complicated and not recommended unless you need the performance.

Don't forget that the NIC will usually filter out the Ethernet multicast on Rx until you open a socket and do an 
SIOCADDMULTI ioctl.

Also in your description of the packet you left out the Ethertype. You will need to use one that identifies your traffic
 to avoid it being mis-identified by other devices on the network. Please see
http://standards.ieee.org/develop/regauth/ethertype/public.html

Regards,
Nick.
Dennis Kellly
02/05/2014 10:03 AM
post108612
Re: Ethernet mutlicast   
This source shows how to send/receive arbitrary ethernet frames via bpf - also how to receive frames in promiscuous mode
 (when supported by driver).  Perhaps it may help.
Attachment: Compressed file bpf.zip 8.33 KB
Veniamin Afanasev(deleted)
02/05/2014 11:49 AM
post108617
Re: Ethernet mutlicast   
Thank Dennis for source code
Veniamin Afanasev(deleted)
02/05/2014 11:41 AM
post108615
Re: Ethernet mutlicast   
Thanks Nick. You are rigth about Ethertype. I will read about BFP
Sean Boudreau(deleted)
02/05/2014 12:36 PM
post108619
Re: Ethernet mutlicast   
Why are you interested in the mac layer?  Is the usual rfc
ipv[46] <-> ethernet conversion sufficient?

On Wed, Feb 05, 2014 at 02:46:26AM -0500, Veniamin Afanasev wrote:
> Hello! How can i take and send packets with ethernet multicast mac adress and send them to my programm or send them 
from my programm. packet format is: dst multicast mac adress+ src multicast mac adress + data + crc.
> Thanks.
> 
> 
> 
> _______________________________________________
> 
> Technology
> http://community.qnx.com/sf/go/post108604
> To cancel your subscription to this discussion, please e-mail technology-networking-unsubscribe@community.qnx.com
Veniamin Afanasev(deleted)
02/05/2014 1:09 PM
post108621
Re: Ethernet mutlicast   
I need in in goose and gsse in IEC61850 protocol stack


> 
> Why are you interested in the mac layer?  Is the usual rfc
> ipv[46] <-> ethernet conversion sufficient?
> 
> On Wed, Feb 05, 2014 at 02:46:26AM -0500, Veniamin Afanasev wrote:
> > Hello! How can i take and send packets with ethernet multicast mac adress 
> and send them to my programm or send them from my programm. packet format is: 
> dst multicast mac adress+ src multicast mac adress + data + crc.
> > Thanks.
> > 
> > 
> > 
> > _______________________________________________
> > 
> > Technology
> > http://community.qnx.com/sf/go/post108604
> > To cancel your subscription to this discussion, please e-mail technology-
> networking-unsubscribe@community.qnx.com
Tim shu(deleted)
01/04/2016 1:07 AM
post115389
Re: Ethernet mutlicast   
I alse need in in goose and gsse in IEC61850 protocol stack.Please tell me some demos.Thanks!
Nick Reilly
01/04/2016 8:28 AM
post115390
Re: Ethernet mutlicast   
We do not have support for goose and gsse from IEC61850. You will need to either write your own or engage with a 3rd 
party.

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