RE: [lwip-users] Accepting multicast UDP packets

[Robert Brown]

You are on the right track.  I implemented support for multicast IP in lwIP
0.6.4 in the manner you have suggested.  My application is a Universal Plug
and Play control point.  As such it is necessary to send and receive
multicast IP packets.  The attached file contains some code snippets to
indicate what I did to get this to work.

I assume you are using an ethernet interface. Depending upon the nature of
your application you may need to enable Rx for ethernet multicast addresses
in your ethernet chip.

Rob



-----Original Message-----
From: address@hidden
[mailto:address@hidden Behalf
Of Bilow Rodriguez
Sent: Monday, May 03, 2004 5:59 PM
To: address@hidden
Subject: [lwip-users] Accepting multicast UDP packets


Greetings lwip users!

I am a newbie to lwip, but like it very much so far.
We are using the socket level interface for an
application using TCP and UDP networking.  So far,
verything is great.

The problem we have run in to now, though, is
regarding how to make the application accept UDP
multicast packets.

Does one need to call netif_add() for the additional
ip addresses corresponding to the multicast packets?
Or is there a better way?

Guidance and suggestions would be greatly appreciated.

-Bilowfan





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sample_mcast.c
Description: Binary data