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IP Multicast (just 'casting, not rcving)
- Date: Mon, 5 Feb 2001 15:45:57 -0500
- From: Gene.Smith at sea.siemens.com (Smith, Gene)
- Subject: IP Multicast (just 'casting, not rcving)
A while back I asked if multicast was supported in rtems. I have since
realized that I only need to transmit multicast messages, not receive them.
Does anyone know if rtems might support just sending a multicast? When I
try to send a udp packet to a multcast address, eg, 188.8.131.52, my current
udp code fails in send() with "Network Unreachable" and nothing is
transmitted on the network per tcpdump. Perhaps I need to set a socket
option to tell it the multicast interface, although Steven seems to says you
don't need to set socket options or join a group to just send a multicast.
Any ideas while I continue reading rtems-bsd code and Stevens?
> -----Original Message-----
> From: suvrat gupta [mailto:suvrat at utstar.com]
> Sent: Tuesday, August 01, 2000 5:16 PM
> To: Smith, Gene
> Subject: Re: IP Multicast
> I looked at it about two months ago. Seemed like most of the
> IP stack does
> support it.. The ethernet driver needs to support multicast related
> ioctls(add/remove address in the H/W filter).this can be done
> by usingl
> ether_addmulti() ether_delmulti() functions(you may need to
> modify them a bit.
> Try using the latest RTEMS code.
> hope this helps. In case you do come to know of some working
> let me know.
> "Smith, Gene" wrote:
> > Is IP Multicast actually supported in RTEMS? If so, has it
> been used by
> > anyone? All the drivers in "network" directories seem to
> say FIXME and
> > ERROR when referring to multicast. I didn't see multicast
> mentioned in
> > Networking Suppliment.
> > My application might need some form of multicast. However,
> a simple subnet
> > broadcast might do.
> > -Gene