Date: Fri, 3 Aug 2001 09:30:42 -0700 From: Bill Fenner <fenner@research.att.com> To: freebsd@gndrsh.dnsmgr.net Cc: daniel.sobral@tcoip.com.br, stable@freebsd.org Subject: Re: Request for testers: multicast patch Message-ID: <200108031630.JAA18384@windsor.research.att.com>
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>> 1) Enable one to send multicast packets without a default route or
>> routes to the multicast addresses.
>
>This might break part of the multicast propogation protection, IIRC
>this was a specific feature of the original Deering multicast code
>to prevent unwanted propogation of multicast packets on multihomed
>hosts.
This is only for packets sourced by the host, which the application
has already explicitly requested a single interface for the packet to
go out. See paragraph 3 of section 6.1 of RFC 1112.
>> 2) Enable one to send multicast packets on an interface without an address.
>>
>> 3) Prevent trouble if packets are sent through an interface without an
>> address (vlan excluded).
>
>What source IP address is used for 2 and 3???
0.0.0.0. RFC 1122 section 3.2.1.3 says
This host on this network. MUST NOT be sent, except as
a source address as part of an initialization procedure
by which the host learns its own IP address.
but it's not up to the OS to determine whether or not the application
is performing an initialization procedure by which the host learns its
own IP address.
Bill
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