How to configure CUPS to share printers via IPP - and what network interfaces it listens on?

Asked May 06 '18 at 22:32

Active May 06 '18 at 22:32

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I have Ubuntu Server with CUPS, and a printer added to that server via IPP.

I'd like to re-share this printer to other clients via ZeroTier.

In CUPS admin, I've enabled " Share printers connected to this system".

I then added the printer on a MacOS system, using the IP address of the Linux server and the printer queue name.

However, print jobs do not go through.

Is there something I need to do, to get CUPS print sharing to work on specific network interfaces?

I edited /etc/cups/cupsd.conf to add a Listen directive for the ZeroTier IP address:

Port 631
Listen /run/cups/cups.sock
Listen 172.24.182.95:631

However, this didn't do anything - and from the port 631 - is this just for the CUPS control interface anyhow? (which actually worked via ZeroTier even without this line).

Is there some other config that controls how IPP works via CUP?

asked May 06 '18 at 22:32

victorhooi

Are you running a host firewall? – Michael Hampton May 06 '18 at 23:28
No, there shouldn't be. I can connect fine to port 631 via HTTP in my browser - e.g. http://172.24.182.95:631/printers/. IPP printing uses UDP 631, right? – victorhooi May 07 '18 at 01:44
IPP uses both TCP and UDP port 631. Both of these must be open in any firewall. – Michael Hampton May 07 '18 at 02:19
There's no firewall on the Linux Ubuntu machine, nor on the MacOS clients. – victorhooi May 07 '18 at 05:38

How to configure CUPS to share printers via IPP - and what network interfaces it listens on?

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