<p>This help document describes the ports that CUPS uses so that firewall administrators can allow traffic used for printing.</p>
- <h2 class="title">Ports Used for Printer Sharing</h2>
+ <h2 class="title" id="SHARING">Ports Used for Printer Sharing</h2>
- <p>The following ports are used for printer sharing:</p>
+ <p>Table 1 lists the ports that are used for IPP printer sharing via CUPS.</p>
- <div class="table"><table summary="Ports Used for Printer Sharing">
+ <div class="table"><table summary="Ports Used for IPP Printer Sharing">
+ <caption>Table 1: Ports Used for IPP Printer Sharing</caption>
<thead>
- <tr><th>Port</th><th>TCP/UDP</th><th>Description</th></tr>
+ <tr><th>(Destination) Port</th><th>TCP/UDP</th><th>Direction</th><th>Description</th></tr>
</thead>
<tbody>
- <tr><td>53 (DNS)</td><td>TCP/UDP</td><td>Domain Name System lookups and service registrations.</td></tr>
- <tr><td>137 (WINS)</td><td>UDP</td><td>Windows Internet Naming Service (name lookup for SMB printing).</td></tr>
- <tr><td>139 (SMB)</td><td>TCP</td><td>Windows SMB printing.</td></tr>
- <tr><td>445 (SMBDS)</td><td>TCP</td><td>Windows SMB Domain Server (authenticated SMB printing).</td></tr>
- <tr><td>631 (IPP/IPPS)</td><td>TCP</td><td>Internet Printing Protocol requests and responses (print jobs, status monitoring, etc.)</td></tr>
- <tr><td>5353 (mDNS)</td><td>UDP</td><td>Multicast DNS lookups and service registrations.</td></tr>
+ <tr><td>53 (DNS)</td><td>TCP/UDP</td><td>OUT</td><td>Domain Name System lookups and service registrations.</td></tr>
+ <tr><td>631 (IPP/IPPS)</td><td>TCP</td><td>IN</td><td>Internet Printing Protocol requests and responses (print jobs, status monitoring, etc.)</td></tr>
+ <tr><td>5353 (mDNS)</td><td>UDP</td><td>IN+OUT</td><td>Multicast DNS lookups and service registrations.</td></tr>
+ </tbody>
+ </table></div>
+
+ <p>Table 2 lists the ports that are used for SMB (Windows) printer sharing, typically via the Samba software.</p>
+
+ <div class="table"><table summary="Ports Used for SMB Printer Sharing">
+ <caption>Table 2: Ports Used for SMB Printer Sharing</caption>
+ <thead>
+ <tr><th>(Destination) Port(s)</th><th>TCP/UDP</th><th>Direction</th><th>Description</th></tr>
+ </thead>
+ <tbody>
+ <tr><td>137 (WINS)</td><td>UDP</td><td>IN+OUT</td><td>Windows Internet Naming Service (name lookup for SMB printing).</td></tr>
+ <tr><td>139 (SMB)</td><td>TCP</td><td>IN</td><td>Windows SMB printing.</td></tr>
+ <tr><td>445 (SMBDS)</td><td>TCP</td><td>IN+OUT</td><td>Windows SMB Domain Server (authenticated SMB printing).</td></tr>
</tbody>
</table></div>
- <h2 class="title">Ports Used for Network Printers</h2>
+ <h2 class="title" id="PRINTERS">Ports Used for Network Printers</h2>
+
+ <p>Table 3 lists the ports for outgoing network traffic that are used for network printers.</p>
- <p>The following ports are used for network printers:</p>
+ <blockquote><b>Notes:</b>
+ <ol>
+ <li>DNS and mDNS are used for all printing protocols except SMB.</li>
+ <li>SNMP is used to provide status and supply level information for AppSocket and LPD printers.</li>
+ </ol>
+ </blockquote>
- <div class="table"><table summary="Ports Used for Network Printers">
+ <div class="table"><table summary="Outgoing Ports Used for Network Printers">
+ <caption>Table 3: Outgoing Ports Used for Network Printers</caption>
<thead>
- <tr><th>Port(s)</th><th>TCP/UDP</th><th>Description</th></tr>
+ <tr><th>(Destination) Port(s)</th><th>TCP/UDP</th><th>Description</th></tr>
</thead>
<tbody>
<tr><td>53 (DNS)</td><td>TCP/UDP</td><td>Domain Name System lookups.</td></tr>