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    <p><strong>Possible solution</strong> (or kludge should I say).<br> The only way I can see of achieving this is to extend the network mask to 255.255.0.0 (class B network mask) for all the linuxpc boxes.<br> You will have to do that, however, on the DHCP server, in the same way you configure that linuxpc1 eth0 mac address will be assigned ip address 192.168.0.101.<br> This means merging all your Class C private sub-networks into a single class B chunk.</p> <p><strong>Detail</strong><br> Otherwise, I don't think you can do that with avahi straight out of the box. Here is why. </p> <p>Avahi uses mDNS to publicize hostnames.</p> <p><strong>In detail, things work like this:</strong><br> As part of it's processing logic, your linuxpc3's avahi daemon will send a DNS UDP datagram on port 5353 (?) on ip address 224.0.0.51.<br> This address is one of the multicast addresses reserved for zeroconf (see <a href="http://www.iana.org/assignments/multicast-addresses/multicast-addresses.xml" rel="nofollow">iana multicast addresses</a>). </p> <p>Assuming linuxpc3 address is 192.168.2.103 (following your naming convention), and assuming a standard class C network mask of 255.255.255.0, then only those boxes with addresses between 192.168.2.1 and 192.168.2.254 will receive the corresponding dns A update record (by which I mean the other avahi/bonjour daemons running in these boxes). </p> <p>As a result, neither linuxpc1 nor linuxpc2 will be made aware of the linuxpc3.local hostname/address pair.</p> <p>If instead the network mask of all these boxes is extended to 255.255.0.0 then the broadcast range will be extended to include all addresses in the 192.168/16 network.</p> <p><a href="http://tools.ietf.org/html/rfc1918" rel="nofollow">RFC1918</a>, the standard for <a href="http://en.wikipedia.org/wiki/Private_network" rel="nofollow">private networks</a> explicitly allows the 192.168.0.0 block to be configured as a single class B subnetwork.</p> <p><strong>Update</strong><br> Having seen your comments.</p> <p>First conclusion. Avahi has no solution for your combination of requirements.<br> Avahi relies on subnetwork broadcast.</p> <p>In a similar context in which avahi was not applicable either, I once resorted to automate the update of /etc/hosts files and DNS records through the detection of connection events changes. </p> <p>All PCs could see the internet and were detecting conection changes (Linux in <a href="http://linux.die.net/man/1/networkmanagerdispatcher" rel="nofollow">NetworkManager dispatcher hooks</a> - Windows through subscription to the <a href="http://msdn.microsoft.com/en-us/magazine/cc301850.aspx" rel="nofollow">System Event Notification Service</a>). </p> <p>All machines were reporting their connectivity status and ip addresses through messages in www.dropbox.com and were getting their updates from their respective local dropbox folder. </p> <p>If you want to implement this in stead, or a similar solution, I have to warn you this is quite a bit of work.</p>
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    1. POIs it possible to collect .local domain ip addresses hierarchically for building dhcp based dns?
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    1. USAlain Pannetier
    1. USAlain Pannetier
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    1. COThanks for answering, but my premise here is to not change anything in the environment.
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    2. COAnd the priority is just being able to figure out the ip addresses, don't care about the implementation details. So anything like uploading the avahi-browsed result to a fqdn browseable wiki server, and just make other PCs to refer to the wiki server can be a solution. But this is too ridiculous, and if there were a standard-ish solution, then I would be happy.
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