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Old 03-05-2010, 03:22 AM   #1
replicom1
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converting IP multicast to MAC LLC broadcast


This is not a linux specific question more of a general network issue with the hope that someone may have already done this under linux.

My problem:

I have a red hat linux machine transmitting IP multicast packets onto an ethernet gigabit network (cisco switch).

Wireshark (running on a different red hat linux box confirms packets on network.

IBM risc 6000 AIX 3.2.5 (10/100BT) box needs to read these packets in (cringe!)
AIX 3.2.5 does not support IP multicast. nobody wants to modify the aix box!

The question:

Does anyone know of a router or a piece of software which will read in ip multicast and output MAC LLC broadcast.
I.E. read in the packet, strip off layers 3 & 4 and re-transmit with a MAC broadcast address.

My colleagues suggested using a windows2000 box with two ethernet adapters and to write a piece of custom code to read in from one and output to another doing the above.

My inward response was surely a version of linux would be better.
(I do have an inner loathing of windows)

And as we already have 6 red linux sun servers on the network.....

heres hoping.

TIA
 
Old 03-06-2010, 11:55 AM   #2
nimnull22
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As I understand multicast is transmitting packets to this range of IP - 224.0.0.0 to 239.255.255.255.

Broadcast is transmitting packets to x.x.x.255 - to all.

You want to say that your application or process easily can listen for packets on multicast IP and broadcast IP?
If it does, then you can just set up Linux computer, catch with it multicast and retransmit it to AIX 3.2.5 IP.
Can you?
 
Old 03-08-2010, 02:11 AM   #3
replicom1
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Quote:
Originally Posted by nimnull22 View Post
As I understand multicast is transmitting packets to this range of IP - 224.0.0.0 to 239.255.255.255.

Broadcast is transmitting packets to x.x.x.255 - to all.

You want to say that your application or process easily can listen for packets on multicast IP and broadcast IP?
If it does, then you can just set up Linux computer, catch with it multicast and retransmit it to AIX 3.2.5 IP.
Can you?
Yes i agree to the statements above.

To clarify,

The transmitting box cannot be changed easily.
The receiving box is aix 3.2.5 which cannot receive ip multicast

I wish to insert an interface between them, hardware or software which will convert ip multicast to MAC LLC broadcast without the IP and UDP header.

I wanted to know if anyone has already done this.

Yes I agree that I could write a program to read in IP multicast and re-transmit at MAC LLC level but I dont want to re-invent the wheel.

Regards

Wayne
 
Old 03-08-2010, 09:58 AM   #4
replicom1
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It gets worse have just stuck wireshark on the output and found that it is SNA protocol that the AIX 3.2.5 box is expecting to read.
so I am now trying to convert IP multicast to SNA
Wayne
 
Old 08-27-2010, 01:42 PM   #5
rinkee
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hello Wayne. I have a very similar problem and looking for some piece of software/program that converts multicast IP address to MAC and vice versa.
Let me know if you have found a solution to it.
Thanks

Last edited by rinkee; 08-27-2010 at 02:37 PM.
 
  


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