Re: Zeroconfig and Multicast DNS

On Fri, Aug 25, 2006 at 10:35:03AM +0900, JINMEI Tatuya / ?$B?@L@C#:H wrote:
On Thu, 24 Aug 2006 13:42:29 -0500,
Brooks Davis <brooks@xxxxxxxxxxxxxxxxxx> said:

Um...I'm not sure if this is even possible. Let's forget mDNS and
go back to basic IP.
Say a multi-homed host has two interfaces both configured with an
address in the rage 169.254/16, say 169.254.1.1 and 169.254.2.1 and
it wants to initiate a connection to 169.254.3.1, how on earth should
it be able to tell on which side 3.1 is located? There might even be
one 3.1 on both side that could be completely different hosts.

You probably would need an extension similiar to the one for IPv6 LLAs.
i.e. the %bge0 in fe80::2e0:81ff:fe31:9f00%bge0.

(I've not followed the discussion closely, so my apologize in advance
if this message reacts to an off-topic.)

Note that the '%bge0' notation works well thanks to the sin6_scope_id
field of the sockaddr_in6{} structure. Since sockaddr_in{} doesn't
have such an additional member to solve the ambiguity, the extension
to the IPv4 addresses would not be that trivial.

Thanks for the response. That makes sense. I think due to the
sin_zero member in sockaddr_in{} we could fix this without breaking
ABI compatability if we shrunk sin_zero appropriatly (or for API
compatability created a union and #defined sin_zero) and then added a
reference to the interface index. That would have the advantage of also
letting us clean up the abuse of sin_zero to store the interface name in
ip_divert.c.

-- Brooks

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