How to forward service discovery accross VLANs
I am trying to understand how server discovery works. I have a Mac running unified remote server on a VLAN, Android app on another VLAN. The phone does not see the server automatically. I can configure the server's address manually, it works, but I'd like to automate discovery.
You need to Google "Broadcast from one VLan to another"....... or similar.
It will be much more difficult than you imagine..... or you would not be asking the question.
It will very much depend on the capabilities of your routers and Nics.
This is the best doc that I can find straight away.......
"...... to solve your issue you will need both ip forward-protocol, ip helper-address and ip directed-broadcast commands. You will need the ip forward-protocol, and the ip helper-address on the interface where the server is located. You will need to configure the helper address to point to the subnet broadcast of the remote VLAN (for example if the remote VLAN is subnet 172.16.4.0/24 then you would configure ip helper-address 172.16.4.255). And you need ip directed-broadcast on the remote VLAN interface.
You need the forward-protocol command to identify the protocol to forward, and you need the helper-address to specify that it gets forwarded to the remote subnet as a subnet broadcast. You need the directed-broadcast on the remote VLAN interface because otherwise the interface will receive the forwarded packet but will not forward it onto the subnet."