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

Grant Edwards grant.b.edwards@gmail.com
Wed Mar 30 14:33:00 GMT 2011

On 2011-03-29, Gary Thomas <gary@mlbassoc.com> wrote:
>> As you can see, the output code rejects the packet for lack of a valid
>> route to the destination IP address before it checks to see if it's a
>> multicast IP address.
>> That doesn't look right to me...
>> If it's a multicast destination, shouldn't that short-circuit the
>> route-checking stuff?
>> The docs I can find are pretty clear: if it's a multicast IP
>> destination you ship it out to the corresponding multicast MAC
>> address. Period. No messing about with routes and gateway addresses.
> I agree that this doesn't seem right.  You might try looking at the
> current BSD networking code

That's on the list of things to do...

> to see if this has changed since I merged the stack last - some *ten*
> years ago :-)

Ten years?  Cripes. Maybe it's time I stopped referring to it as the
"new stack".

> If you find a fix/work-around, send a patch!

Grant Edwards               grant.b.edwards        Yow! TAILFINS!! ... click
                                  at               ...

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