On Mon, May 29, 2017 at 06:49:54PM -0700, David Ranch wrote:
Understood but if we started advising users to enable Avahi, MNDP, etc. to UCSD's IP, you would start to see richer data. The question is.. can these different protocols be configured to only send these advertisements (broadcasts) to the UCSD IP vs. everyone. --David KI6ZHD
As far as I can see, you can't enable these services to a specific IP, you enable them to a multicast or broadcast address that is defined for the particular service.
According to some of the online info, these typically have to be enabled on a per-interface basis. Whether they would get forwarded from a host sending one of them through a gateway router and then to UCSD is an iffy question - most of the stuff I saw on line was about being sure to block such traffic with various interface configurations and firewall rules.
And as you say, you probably don't want to forward them down every tunnel you have access to, just to the one at UCSD, and that's a whole bag of worms in itself, when you consider that for most Linux gateways, it's the same interface for all tunnels.
Mikrotik might be different because you have to have one tunnel interface per destination tunnel, and presumably you could enable MNDP on just the one facing UCSD, but I'm not sure there's much to be learned from MNDP except perhaps the model of Mikrotik in use.
For Avahi and such, I see many difficulties. - Brian