I think there is some confusion between VLANs and subnets. The multiple
subnets Jens is referring to are IP subnets. An IP address is
associated with a subnet. The subnet effectively defines which other IP
addresses are local at the IP layer (don't have to go through a router
to reach).
Rendezvous uses IP link-local multicasts. These multicast packets are
sent to every node on the "link". A link, for ethernet, is defined by
how far an ethernet multicast packet will travel.
VLANs let you create multiple networks at the link layer. This
effectively takes one link and adds a special header to make it look
like there are actually multiple links. Multicast DNS will not work
beyond a single link. Since a VLAN effectively limits the scope of a
link, the VLAN limits the scope of dot-local names and services.
-josh
On Jul 6, 2004, at 1:24 PM, Matt Harrington wrote:
> On Tuesday, June 29, 2004, at 01:49 PM, Jens Alfke wrote:
>
>> mDNS uses link-local multicast and (to avoid spoofing) discards any
>> incoming packets with a TTL < 255. This means you won't be able to use
>> mDNS through a router. It's possible to set up multiple subnets on the
>> same switch and mDNS would work with those; but you probably don't
>> want
>> to do that for an entire building with 20 subnets.
>
>
> So it's impossible to use the current implementation of Rendezvous
> across a router, even when VLANs are implemented? When I say VLAN, I
> mean a collection of nodes in the same broadcast domain even if
> they're on different network segments separated by a router. I spent
> some time investigating exactly what link-local multicast is, but I
> didn't see how it ties in with VLANs.
>
> ---Matt
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