On Sat, 2014-10-11 at 21:26 -0400, Kevin Cummings wrote: > When I started the Print Settings tool, I had to unlock it first, then > I started the ADD PRINTER dialogue. When it prompted to select > device, I opened the Network Printer expansion, but the printer I was > looking for was not present, so I decided to enter it manually. While > I was trying to figure out how to do that, an entry for the printer > "magically" appeared in the network list! I guess it took a little > time to "find" it. My experience with these kind of things (auto discovery of things on a network), is that there is nearly always some sort of delay (either you're waiting for periodic announcement of available things on the net, or waiting for things to reply to a request of what's out there), but I have never managed to find anything that defines what the delay will be, nor why? Was it simply call and response time (didn't seem likely, as the period could be a few seconds to minutes), or was there a periodic announcement, with a random or defined period? With CUPS, at least, it was necessary to have a hole in your firewall to receive these announcements (the IPP *service* needed to be allowed). I'd imagine a similar requirement for ZeroConf, Avahi, or any other auto-discovery process. It's all peer-to-peer, not run by a central server (unless you're using Samba, which has a semi-random server), so you have to have a hole open and waiting, all the time. If there was a central server, you wouldn't need to, your client would make a request, and get a reply. That reply would be *related* to your query, and would (should?) automatically make it back through your firewall, without requiring special configuration (normal firewall configuration is to *allow* *related* traffic through). -- tim@localhost ~]$ uname -rsvp Linux 3.16.3-200.fc20.i686 #1 SMP Wed Sep 17 23:07:44 UTC 2014 i686 All mail to my mailbox is automatically deleted, there is no point trying to privately email me, I will only read messages posted to the public lists. George Orwell's '1984' was supposed to be a warning against tyranny, not a set of instructions for supposedly democratic governments. -- users mailing list users@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe or change subscription options: https://admin.fedoraproject.org/mailman/listinfo/users Fedora Code of Conduct: http://fedoraproject.org/code-of-conduct Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines Have a question? Ask away: http://ask.fedoraproject.org
