3 <!-- SECTION: Getting Started -->
5 <title>Firewalls
</title>
6 <link rel=
"stylesheet" type=
"text/css" href=
"../cups-printable.css">
9 <h1 class=
"title">Firewalls
</h1>
11 <p>This help document describes the ports that CUPS uses so that firewall administrators can allow traffic used for printing.
</p>
13 <h2 class=
"title">Ports Used for Printer Sharing
</h2>
15 <p>The following ports are used for printer sharing:
</p>
17 <div class=
"table"><table summary=
"Ports Used for Printer Sharing">
19 <tr><th>Port
</th><th>TCP/UDP
</th><th>Description
</th></tr>
22 <tr><td>53 (DNS)
</td><td>TCP/UDP
</td><td>Domain Name System lookups and service registrations.
</td></tr>
23 <tr><td>137 (WINS)
</td><td>UDP
</td><td>Windows Internet Naming Service (name lookup for SMB printing).
</td></tr>
24 <tr><td>139 (SMB)
</td><td>TCP
</td><td>Windows SMB printing.
</td></tr>
25 <tr><td>445 (SMBDS)
</td><td>TCP
</td><td>Windows SMB Domain Server (authenticated SMB printing).
</td></tr>
26 <tr><td>631 (IPP/IPPS)
</td><td>TCP
</td><td>Internet Printing Protocol requests and responses (print jobs, status monitoring, etc.)
</td></tr>
27 <tr><td>5353 (mDNS)
</td><td>UDP
</td><td>Multicast DNS lookups and service registrations.
</td></tr>
32 <h2 class=
"title">Ports Used for Network Printers
</h2>
34 <p>The following ports are used for network printers:
</p>
36 <div class=
"table"><table summary=
"Ports Used for Network Printers">
38 <tr><th>Port(s)
</th><th>TCP/UDP
</th><th>Description
</th></tr>
41 <tr><td>53 (DNS)
</td><td>TCP/UDP
</td><td>Domain Name System lookups.
</td></tr>
42 <tr><td>137 (WINS)
</td><td>UDP
</td><td>Windows Internet Naming Service (name lookup for SMB printing).
</td></tr>
43 <tr><td>139 (SMB)
</td><td>TCP
</td><td>Windows SMB printing.
</td></tr>
44 <tr><td>161 (SNMP)
</td><td>UDP
</td><td>SNMP browsing (broadcast) and status monitoring (directed to printer IP address).
</td></tr>
45 <tr><td>443 (IPPS)
</td><td>TCP
</td><td>Internet Printing Protocol requests and responses (print jobs, status monitoring, etc.)
</td></tr>
46 <tr><td>445 (SMBDS)
</td><td>TCP
</td><td>Windows SMB Domain Server (authenticated SMB printing).
</td></tr>
47 <tr><td>515 (LPD)
</td><td>TCP
</td><td>Line Printer Daemon (LPD/lpr) print job submission and status monitoring.
</td></tr>
48 <tr><td>631 (IPP/IPPS)
</td><td>TCP
</td><td>Internet Printing Protocol requests and responses (print jobs, status monitoring, etc.)
</td></tr>
49 <tr><td>5353 (mDNS)
</td><td>UDP
</td><td>Multicast DNS lookups.
</td></tr>
50 <tr><td>9100-
9102</td><td>TCP
</td><td>Raw print data stream (AppSocket/JetDirect).
</td></tr>