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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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2003-02-08 21:46:02 +01:00
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2002-11-09 19:06:34 +01:00
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content="text/html; charset=windows-1252">
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<title>Shorewall Port Information</title>
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2003-02-08 21:46:02 +01:00
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2002-11-09 19:06:34 +01:00
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<meta name="GENERATOR" content="Microsoft FrontPage 5.0">
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<meta name="ProgId" content="FrontPage.Editor.Document">
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</head>
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2002-11-09 19:06:34 +01:00
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<body>
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2002-11-09 19:06:34 +01:00
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<table border="0" cellpadding="0" cellspacing="0"
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style="border-collapse: collapse;" bordercolor="#111111" width="100%"
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<tbody>
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<tr>
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<td width="100%">
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<h1 align="center"><font color="#ffffff">Ports required for Various
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Services/Applications</font></h1>
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</td>
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</tr>
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</tbody>
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</table>
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2002-11-09 19:06:34 +01:00
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<p>In addition to those applications described in <a
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href="Documentation.htm">the /etc/shorewall/rules documentation</a>, here
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are some other services/applications that you may need to configure your
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firewall to accommodate.</p>
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<p>NTP (Network Time Protocol)</p>
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<blockquote>
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<p>UDP Port 123</p>
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</blockquote>
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<p>rdate</p>
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<blockquote>
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<p>TCP Port 37</p>
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</blockquote>
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<p>UseNet (NNTP)</p>
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<blockquote>
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<p>TCP Port 119</p>
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</blockquote>
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<p>DNS</p>
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<blockquote>
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<p>UDP Port 53. If you are configuring a DNS client, you will probably want
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to open TCP Port 53 as well.<br>
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If you are configuring a server, only open TCP Port 53 if you will
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return long replies to queries or if you need to enable ZONE transfers.<2E>In
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the latter case, be sure that your server is properly configured.</p>
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</blockquote>
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<p>ICQ<EFBFBD><EFBFBD><EFBFBD></p>
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<blockquote>
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<p>UDP Port 4000. You will also need to open a range of TCP ports which
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you can specify to your ICQ client. By default, clients use 4000-4100.</p>
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</blockquote>
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<p>PPTP</p>
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<blockquote>
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<p><u>Protocol</u> 47 (NOT <u>port</u> 47) and TCP Port 1723 (<a
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href="PPTP.htm">Lots more information here</a>).</p>
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</blockquote>
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<p>IPSEC</p>
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<blockquote>
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<p><u>Protocols</u> 50 and 51 (NOT <u>ports</u> 50 and 51) and UDP Port
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500. These should be opened in both directions (Lots more information
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<a href="IPSEC.htm">here</a> and <a href="VPN.htm">here</a>).</p>
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</blockquote>
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<p>SMTP</p>
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<blockquote>
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<p><EFBFBD>TCP Port 25.</p>
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</blockquote>
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<p>POP3</p>
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<blockquote>
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<p>TCP Port 110.</p>
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</blockquote>
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<p>TELNET</p>
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<blockquote>
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<p>TCP Port 23.</p>
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</blockquote>
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<p>SSH</p>
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<blockquote>
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<p>TCP Port 22.</p>
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</blockquote>
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<p>Auth (identd)</p>
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<blockquote>
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<p>TCP Port 113</p>
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</blockquote>
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<p>Web Access</p>
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<blockquote>
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<p>TCP Ports 80 and 443.</p>
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</blockquote>
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<p>FTP</p>
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<blockquote>
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<p>Server configuration is covered on in <a
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href="Documentation.htm#Rules">the /etc/shorewall/rules documentation</a>,</p>
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<p>For a client, you must open outbound TCP port 21 and be sure that your
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kernel is compiled to support FTP connection tracking. If you build this
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support as a module, Shorewall will automatically load the module from
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/var/lib/<<i>kernel version</i>>/kernel/net/ipv4/netfilter.<2E><br>
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</p>
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<p>If you run an FTP server on a nonstandard port or you need to access
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such a server, then you must specify that port in /etc/shorewall/modules.
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For example, if you run an FTP server that listens on port 49 then you would
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have:<br>
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</p>
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<blockquote>
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<p>loadmodule ip_conntrack_ftp ports=21,49<br>
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loadmodule ip_nat_ftp ports=21,49<br>
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</p>
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</blockquote>
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<p>Note that you MUST include port 21 in the <i>ports</i> list or you may
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have problems accessing regular FTP servers.</p>
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2003-02-08 21:46:02 +01:00
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<p>If there is a possibility that these modules might be loaded before Shorewall
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starts, then you should include the port list in /etc/modules.conf:<br>
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</p>
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<blockquote>
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<p>options ip_conntrack_ftp ports=21,49<br>
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options ip_nat_ftp ports=21,49<br>
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</p>
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</blockquote>
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</blockquote>
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2002-11-09 19:06:34 +01:00
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<p>SMB/NMB (Samba/Windows Browsing/File Sharing)</p>
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2002-11-09 19:06:34 +01:00
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<blockquote> </blockquote>
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<blockquote>
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<p>TCP Ports 137, 139 and 445.<br>
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UDP Ports 137-139.<br>
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<br>
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Also, <a href="samba.htm">see this page</a>.</p>
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</blockquote>
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2002-11-09 19:06:34 +01:00
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<p>Traceroute</p>
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<blockquote>
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<p>UDP ports 33434 through 33434+<i><max number of hops></i>-1</p>
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</blockquote>
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<p>NFS<br>
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</p>
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<blockquote>
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<p>I personally use the following rules for opening access from zone z1
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to a server with IP address a.b.c.d in zone z2:<br>
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</p>
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<pre>ACCEPT z1 z2:a.b.c.d udp 111<br>ACCEPT z1 z2:a.b.c.d udp 2049<br>ACCEPT z1 z2:a.b.c.d udp 32700:<br></pre>
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</blockquote>
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2003-02-08 21:46:02 +01:00
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<blockquote>
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<p>Note that my rules only cover NFS using UDP (the normal case). There
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is lots of additional information at<61> <a
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href="http://nfs.sourceforge.net/nfs-howto/security.html"> http://nfs.sourceforge.net/nfs-howto/security.html</a></p>
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</blockquote>
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<p>Didn't find what you are looking for -- have you looked in your own /etc/services
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file? </p>
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2002-11-09 19:06:34 +01:00
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<p>Still looking? Try <a
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href="http://www.networkice.com/advice/Exploits/Ports"> http://www.networkice.com/advice/Exploits/Ports</a></p>
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<p><font size="2">Last updated 2/7/2003 - </font><font size="2"> <a
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href="support.htm">Tom Eastep</a></font> </p>
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<a href="copyright.htm"><font size="2">Copyright</font> <20> <font
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size="2">2001, 2002, 2003 Thomas M. Eastep.</font></a><br>
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<br>
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<br>
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<br>
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</body>
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</html>
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