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Hi I was wondering if any clever people out there could help me. I have a network setup with two different subnets 192.168.1.0 and 192.168.0.0 one router is connected to a VPN (via OpenVPN) the other is not. Both routers have static routes to each other and a device on one can communicate to another without issues when using IP addresses.

My problem is I want to use services like Bonjour, Netbios and Apple Talk across the two networks, which currently does not work. A laptop connected on one subnet will not see a laptop connected on another. Is there anyway that you can connect the two networks together so these sort of local service will work??? I guess I have to forward the boardcast packets but I have no idea how to do this.

Thanks for any help...

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4 Answers

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You probably have /24 or 255.255.255.o as network mask set.

Have you tried setting the network mask to /16 or 255.255.0.0 making it one subnet ?

Be aware that this change changes the network definition and has lots of implications on the functionality of your network. See Subnetwork .

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Hi Thanks for the suggestion, I moved the two routers on to 255.255.0.0 I have also deleted the entries in the routing table as I guess I no longer need these because they are on the same subnet. The computers still can not see each other and now I can no longer connect from one to the other via ip. Any other suggestions, thanks all the same – user72182 Feb 25 '11 at 15:07
Did you also change the netmask on the computers, not only the routers? – rems Feb 25 '11 at 15:14
Computer are all set via DHCP so yep all done. Do I need to add any static routes? – user72182 Feb 25 '11 at 16:17
Do both routers run dd-wrt? Can computers on the same router see each other? Have you searched or asked in the dd-wrt forums? – rems Feb 25 '11 at 16:47
Searched for ages and asked on the dd-wrt (no reply). Computers on the same router can see each other no problem. It's just when they are connected to a different routers that I have the problem. – user72182 Feb 25 '11 at 17:30
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Appletalk is a nonroutable protocol. Netbios has to be reconfigured to allow routing by setting up servers on both sides (don't remember the exact procedure, it's been a while). Never played with Bonjour but a quick Google also indicates it is nonroutable.

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When I say that one is connected by openVPN it's connect as a client. so both routers are local. If what your saying is true I can stop playing a simply give up, thanks for the info. – user72182 Feb 26 '11 at 12:07
@user72182 - Bonjour is multicast however, so should be able to become site-local instead of link-local without too much trouble. For Netbios the answer mostly lies in setting a WINS server to take over the name resolution tasks from the broadcast side. – awoodland Sep 3 '11 at 12:58
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Back in the day when I was trying to get my mt-daapd server visible for iTunes clients over VPN, I used RendezvousProxy. This thing is pretty much deadpooled development wise, but I think even the ancient version might still work.

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To use NetBIOS across subnets, you need a WINS server. Any Samba server can act as one with just "wins support = yes" added to the [Global] section of smb.conf. Then distribute that address to clients using "option netbios-name-servers 192.168.1.100;" in dhcpd.conf for example. If you want another Samba server to use another WINS server, tell him "wins server = 192.168.1.100" in the [Global] section of smb.conf.

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