[ECOS] Why does sending multicast UDP require a gateway?

Grant Edwards grant.b.edwards@gmail.com
Wed Mar 30 14:03:00 GMT 2011

Somebody I work with has spent the last three days trying to send UDP
multicast packets using eCos and the FreeBSD network stack.

After quite a bit of trial-and-error we've discovered that you can't
send UDP multicast packets without configuring a valid gateway

That seems broken to me.

What are you supposed to do if you're on a strictly local network that
doesn't _have_ a gateway?  [That is the case for many of our products.]

UDP multicast (by definition) won't use the gateway, so why require
that one is configured?

Grant Edwards               grant.b.edwards        Yow! It's some people
                                  at               inside the wall!  This is
                              gmail.com            better than mopping!

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