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Re: Rendezvous between subnets?

On Jul 6, 2004, at 4:24 PM, Matt Harrington wrote:
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.

If a packet needs to go through a router, it is not in the same broadcast domain... Typically a "VLAN" == "Broadcast Domain"

I sort of understand that rendezvous uses multicast to do discovery, but then uses unicast to for the actual application. For example, I use multicast DNS to look for a particular service (iChat for example). Other clients that are running rendezvous will be subscribed to the multicast group (A multicast group looks like an IP address, but is in the 224.0.0.0 to 239.255.255.255 range, multicast dns uses From one the mDNS draft http://files.multicastdns.org/draft-cheshire-dnsext-multicastdns.txt rendezvous should be using "(224.0.0.251 or its IPv6 equivalent FF02::FB)"

I am curious about what happens if two machines are in the same broadcast domain but have IP addresses in different subnets (in the case of an overlay network). The mDNS should work... Unless rendezvous discards packets whose source address (as in S,G) is in a different subnet. There is no reason to limit the discovery from working. I would still be able to iChat with someone, the difference would be that the chat would need to bounce off the router.

If you have any questions about the network layer, please feel free to email me off-list. I am not a programmer though. My main interest in rendezvous is understanding how it affects my network.

Peter Hill
Senior Network Engineer
Carnegie Mellon
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 >Re: Rendezvous between subnets? (From: Matt Harrington <email@hidden>)



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