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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<html>
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<head>
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<meta http-equiv="Content-Type"
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content="text/html; charset=windows-1252">
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<title>Multiple Zones per Interface</title>
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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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<meta name="author" content="Tom Eastep">
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</head>
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<body>
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<h2></h2>
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<blockquote> </blockquote>
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<h1 style="text-align: center;">Multiple Zones per Interface<br>
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</h1>
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While most configurations can be handled with each of the firewall's
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network interfaces assigned to a single zone, there are cases where you
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will want to divide the hosts accessed through an interface between two
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or more zones.<br>
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<ol>
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<li>The interface has multiple addresses on multiple subnetworks.
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This case is covered in the <a
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href="Shorewall_and_Aliased_Interfaces.html">Aliased Interface
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documentation</a>.</li>
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<li>You are using some form of NAT and want to access a server by its
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external IP address from the same LAN segment. This is covered in <a
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href="FAQ.htm#faq2">FAQs 2 and 2a</a>.<br>
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</li>
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<li>There are routers accessible through the interface and you want
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to treat the networks accessed through that router as a separate zone.</li>
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<li>Some of the hosts accessed through an interface have
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significantly different firewalling requirements from the others so you
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want to assign them to a different zone.</li>
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</ol>
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The key points to keep in mind when setting up multiple zones per
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interface are:<br>
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<ul>
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<li>Shorewall generates rules for zones in the order that the zone
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declarations appear in /etc/shorewall/zones.</li>
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<li>The order of entries in /etc/shorewall/hosts is immaterial as far
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as the generated ruleset is concerned.</li>
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</ul>
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<span style="font-weight: bold;">These examples use the local zone but
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the same technique works for any zone. </span>Remember that Shorewall
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doesn't have any conceptual knowledge of "Internet", "Local", or "DMZ"
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so all zones except the firewall itself ($FW) are the same as far as
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Shorewall is concerned. Also, the examples use private (RFC 1918)
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addresses but public IP addresses can be used in exactly the same way.<br>
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<h2>Router in the Local Zone<br>
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</h2>
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Here is an example of a router in the local zone. Note that <span
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style="font-weight: bold;">the box called "Router" could be a VPN
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server</span> or other such device; from the point of view of this
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discussion, it makes no difference.<br>
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<br>
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<div style="text-align: center;"><img src="images/MultiZone1.png"
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title="" alt="(Firewall connected to Internal Router)"
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style="width: 556px; height: 335px;"><br>
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</div>
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<blockquote>
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<p> </p>
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</blockquote>
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<blockquote> </blockquote>
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<h3>Can You Use the Standard Configuration?<br>
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</h3>
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In many cases, the <a href="two-interface.htm">standard two-interface
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Shorewall setup</a> will work fine in this configuration. It will
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work if:<br>
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<ul>
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<li>The firewall requirements to/from the internet are the same for
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192.168.1.0/24 and 192.168.2.0/24.</li>
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<li>The hosts in 192.168.1.0/24 know that the route to 192.168.2.0/24
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is through the <span style="font-weight: bold;">router.</span></li>
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</ul>
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All you have to do on the firewall is add a route to 192.168.2.0/24
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through the <span style="font-weight: bold;">router</span> and restart
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Shorewall.<br>
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<h3>Will One Zone be Enough?</h3>
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If the firewalling requirements for the two local networks is the same
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but the hosts in 192.168.1.0/24 don't know how to route to
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192.168.2.0/24 then you need to configure the firewall slightly
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differently. This type of configuration is rather stupid from an IP
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networking point of view but it is sometimes necessary because you
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simply don't want to have to reconfigure all of the hosts in
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192.168.1.0/24 to add a persistent route to 192.168.2.0/24. On the
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firewall:<br>
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<ul>
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<li>Add a route to 192.168.2.0/24 through the <span
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style="font-weight: bold;">Router.</span></li>
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<li>Set the 'routeback' and 'newnotsyn' options for eth1 (the local
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firewall interface) in /etc/shorewall/interfaces.</li>
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<li>Restart Shorewall.<br>
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</li>
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</ul>
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<h3>I Need Separate Zones</h3>
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If you need to make 192.168.2.0/24 into it's own zone, you can do it
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one of two ways; Nested Zones or Parallel Zones.<br>
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<h4>Nested Zones:</h4>
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You can define one zone (called it 'loc') as being all hosts connectied
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to eth1 and a second zone 'loc1' (192.168.2.0/24) as a sub-zone.<br>
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<br>
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<div style="text-align: center;"><img src="images/MultiZone1A.png"
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title="" alt="" style="width: 607px; height: 415px;"><br>
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</div>
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<br>
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The advantage of this approach is that the zone 'loc1' can use CONTINUE
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policies such that if a connection request doesn't match a 'loc1' rule,
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it will be matched against the 'loc' rules. For example, if your
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loc1->net policy is CONTINUE then if a connection request from loc1
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to the internet doesn't match any rules for loc1->net then it will
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be checked against the loc->net rules.<br>
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<br>
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/etc/shorewall/zones:<br>
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<br>
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<div style="margin-left: 40px;">
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<table cellpadding="2" border="1" style="text-align: left;">
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<tbody>
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<tr>
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<td style="vertical-align: top; font-weight: bold;">ZONE<br>
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</td>
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<td style="vertical-align: top; font-weight: bold;">DISPLAY<br>
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</td>
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<td style="vertical-align: top; font-weight: bold;">COMMENTS<br>
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</td>
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</tr>
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<tr>
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<td style="vertical-align: top;">loc1<br>
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</td>
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<td style="vertical-align: top;">Local2<br>
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</td>
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<td style="vertical-align: top;">Hosts access through internal
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router<br>
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</td>
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</tr>
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<tr>
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<td style="vertical-align: top;">loc<br>
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</td>
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<td style="vertical-align: top;">Local<br>
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</td>
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<td style="vertical-align: top;">All hosts accessed via eth1<br>
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</td>
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</tr>
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</tbody>
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</table>
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<br>
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Note that the sub-zone (loc1) is defined first!<br>
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<br>
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</div>
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/etc/shorewall/interfaces<br>
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<br>
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<div style="margin-left: 40px;">
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<table cellspacing="2" border="1" style="text-align: left;">
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<tbody>
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<tr>
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<td style="vertical-align: top; font-weight: bold;">ZONE<br>
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</td>
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<td style="vertical-align: top; font-weight: bold;">INTERFACE<br>
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</td>
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<td style="vertical-align: top; font-weight: bold;">BROADCAST<br>
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</td>
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<td style="vertical-align: top; font-weight: bold;">OPTIONS<br>
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</td>
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</tr>
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<tr>
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<td style="vertical-align: top;">loc<br>
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</td>
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<td style="vertical-align: top;">eth1<br>
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</td>
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<td style="vertical-align: top;">192.168.1.255<br>
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</td>
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<td style="vertical-align: top;">...<br>
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</td>
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</tr>
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</tbody>
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</table>
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<br>
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</div>
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/etc/shorewall/hosts<br>
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<br>
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<div style="margin-left: 40px;">
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<table cellpadding="2" border="1" style="text-align: left;">
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<tbody>
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<tr>
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<td style="vertical-align: top; font-weight: bold;">ZONE<br>
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</td>
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<td style="vertical-align: top; font-weight: bold;">HOSTS<br>
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</td>
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<td style="vertical-align: top; font-weight: bold;">OPTIONS<br>
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</td>
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</tr>
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<tr>
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<td style="vertical-align: top;">loc1<br>
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</td>
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<td style="vertical-align: top;">eth1:192.168.2.0/24<br>
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</td>
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<td style="vertical-align: top;"><br>
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</td>
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</tr>
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</tbody>
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</table>
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</div>
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<br>
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If you don't need Shorewall to set up infrastructure to route traffic
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between 'loc' and 'loc1', add these two policies:<br>
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<br>
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<div style="margin-left: 40px;">
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<table cellpadding="2" border="1" style="text-align: left;">
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<tbody>
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<tr>
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<td style="vertical-align: top; font-weight: bold;">SOURCE<br>
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</td>
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<td style="vertical-align: top; font-weight: bold;">DEST<br>
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</td>
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<td style="vertical-align: top; font-weight: bold;">POLICY<br>
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</td>
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<td style="vertical-align: top; font-weight: bold;">LOG<br>
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LEVEL<br>
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</td>
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<td style="vertical-align: top; font-weight: bold;">RATE:BURST<br>
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</td>
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</tr>
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<tr>
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<td style="vertical-align: top;">loc<br>
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</td>
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<td style="vertical-align: top;">loc1</td>
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<td style="vertical-align: top;">NONE<br>
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</td>
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<td style="vertical-align: top;"><br>
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</td>
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<td style="vertical-align: top;"><br>
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</td>
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</tr>
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<tr>
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<td style="vertical-align: top;">loc1<br>
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</td>
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<td style="vertical-align: top;">loc<br>
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</td>
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<td style="vertical-align: top;">NONE<br>
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</td>
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<td style="vertical-align: top;"><br>
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</td>
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<td style="vertical-align: top;"> <br>
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</td>
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</tr>
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</tbody>
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</table>
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</div>
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<h4>Parallel Zones:</h4>
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You define both zones in the /etc/shorewall/hosts file to create two
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disjoint zones.<br>
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<br>
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<div style="text-align: center;"><img src="images/MultiZone1B.png"
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title="" alt="" style="width: 588px; height: 415px;"><br>
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</div>
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<br>
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/etc/shorewall/zones:<br>
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<br>
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<div style="margin-left: 40px;">
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<table cellpadding="2" border="1" style="text-align: left;">
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<tbody>
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<tr>
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<td style="vertical-align: top; font-weight: bold;">ZONE<br>
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</td>
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<td style="vertical-align: top; font-weight: bold;">DISPLAY<br>
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</td>
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<td style="vertical-align: top; font-weight: bold;">COMMENTS<br>
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</td>
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</tr>
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<tr>
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<td style="vertical-align: top;">loc1<br>
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</td>
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<td style="vertical-align: top;">Local1<br>
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</td>
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<td style="vertical-align: top;">Hosts accessed Directly from
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Firewall<br>
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</td>
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</tr>
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<tr>
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<td style="vertical-align: top;">loc2<br>
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</td>
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<td style="vertical-align: top;">Local2<br>
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</td>
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<td style="vertical-align: top;">Hosts accessed via internal
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Router<br>
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</td>
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</tr>
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</tbody>
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</table>
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<br>
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Here it doesn't matter which zone is defined first.<br>
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<br>
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||||
</div>
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/etc/shorewall/interfaces<br>
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<br>
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<div style="margin-left: 40px;">
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<table cellspacing="2" border="1" style="text-align: left;">
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<tbody>
|
||||
<tr>
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<td style="vertical-align: top; font-weight: bold;">ZONE<br>
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</td>
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<td style="vertical-align: top; font-weight: bold;">INTERFACE<br>
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</td>
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<td style="vertical-align: top; font-weight: bold;">BROADCAST<br>
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</td>
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||||
<td style="vertical-align: top; font-weight: bold;">OPTIONS<br>
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</td>
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</tr>
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<tr>
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||||
<td style="vertical-align: top;">-<br>
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</td>
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||||
<td style="vertical-align: top;">eth1<br>
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</td>
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<td style="vertical-align: top;">192.168.1.255<br>
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</td>
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||||
<td style="vertical-align: top;">...<br>
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||||
</td>
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||||
</tr>
|
||||
</tbody>
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||||
</table>
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||||
<br>
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||||
</div>
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||||
/etc/shorewall/hosts<br>
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<br>
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||||
<div style="margin-left: 40px;">
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||||
<table cellpadding="2" border="1" style="text-align: left;">
|
||||
<tbody>
|
||||
<tr>
|
||||
<td style="vertical-align: top; font-weight: bold;">ZONE<br>
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||||
</td>
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||||
<td style="vertical-align: top; font-weight: bold;">HOSTS<br>
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||||
</td>
|
||||
<td style="vertical-align: top; font-weight: bold;">OPTIONS<br>
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||||
</td>
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||||
</tr>
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||||
<tr>
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||||
<td style="vertical-align: top;">loc1<br>
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||||
</td>
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||||
<td style="vertical-align: top;">eth1:192.168.1.0/24<br>
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||||
</td>
|
||||
<td style="vertical-align: top;"><br>
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||||
</td>
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||||
</tr>
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||||
<tr>
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||||
<td style="vertical-align: top;">loc2<br>
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||||
</td>
|
||||
<td style="vertical-align: top;">eth1:192.168.2.0/24<br>
|
||||
</td>
|
||||
<td style="vertical-align: top;"><br>
|
||||
</td>
|
||||
</tr>
|
||||
</tbody>
|
||||
</table>
|
||||
</div>
|
||||
<br>
|
||||
If you don't need Shorewall to set up infrastructure to route traffic
|
||||
between 'loc' and 'loc1', add these two policies:<br>
|
||||
<br>
|
||||
<div style="margin-left: 40px;">
|
||||
<table cellpadding="2" border="1" style="text-align: left;">
|
||||
<tbody>
|
||||
<tr>
|
||||
<td style="vertical-align: top; font-weight: bold;">SOURCE<br>
|
||||
</td>
|
||||
<td style="vertical-align: top; font-weight: bold;">DEST<br>
|
||||
</td>
|
||||
<td style="vertical-align: top; font-weight: bold;">POLICY<br>
|
||||
</td>
|
||||
<td style="vertical-align: top; font-weight: bold;">LOG<br>
|
||||
LEVEL<br>
|
||||
</td>
|
||||
<td style="vertical-align: top; font-weight: bold;">RATE:BURST<br>
|
||||
</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td style="vertical-align: top;">loc<br>
|
||||
</td>
|
||||
<td style="vertical-align: top;">loc1</td>
|
||||
<td style="vertical-align: top;">NONE<br>
|
||||
</td>
|
||||
<td style="vertical-align: top;"><br>
|
||||
</td>
|
||||
<td style="vertical-align: top;"><br>
|
||||
</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td style="vertical-align: top;">loc1<br>
|
||||
</td>
|
||||
<td style="vertical-align: top;">loc<br>
|
||||
</td>
|
||||
<td style="vertical-align: top;">NONE<br>
|
||||
</td>
|
||||
<td style="vertical-align: top;"><br>
|
||||
</td>
|
||||
<td style="vertical-align: top;"> <br>
|
||||
</td>
|
||||
</tr>
|
||||
</tbody>
|
||||
</table>
|
||||
</div>
|
||||
<h2>Some Hosts have Special Firewalling Requirements</h2>
|
||||
There are cases where a subset of the addresses associated with an
|
||||
interface need special handling. Here's an example.<br>
|
||||
<br>
|
||||
<div style="text-align: center;"><img src="images/MultiZone2.png"
|
||||
title="" alt="" style="height: 252px; width: 631px;"><br>
|
||||
</div>
|
||||
<br>
|
||||
In this example, addresses 192.168.1.8 - 192.168.1.15 (192.168.1.8/29)
|
||||
are to be treated as their own zone (loc1).<br>
|
||||
<br>
|
||||
/etc/shorewall/zones:<br>
|
||||
<br>
|
||||
<div style="margin-left: 40px;">
|
||||
<table cellpadding="2" border="1" style="text-align: left;">
|
||||
<tbody>
|
||||
<tr>
|
||||
<td style="vertical-align: top; font-weight: bold;">ZONE<br>
|
||||
</td>
|
||||
<td style="vertical-align: top; font-weight: bold;">DISPLAY<br>
|
||||
</td>
|
||||
<td style="vertical-align: top; font-weight: bold;">COMMENTS<br>
|
||||
</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td style="vertical-align: top;">loc1<br>
|
||||
</td>
|
||||
<td style="vertical-align: top;">Local2<br>
|
||||
</td>
|
||||
<td style="vertical-align: top;">192.168.1.8 - 192.168.1.15<br>
|
||||
</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td style="vertical-align: top;">loc<br>
|
||||
</td>
|
||||
<td style="vertical-align: top;">Local<br>
|
||||
</td>
|
||||
<td style="vertical-align: top;">All hosts accessed via eth1<br>
|
||||
</td>
|
||||
</tr>
|
||||
</tbody>
|
||||
</table>
|
||||
<br>
|
||||
Note that the sub-zone (loc1) is defined first!<br>
|
||||
<br>
|
||||
</div>
|
||||
/etc/shorewall/interfaces<br>
|
||||
<br>
|
||||
<div style="margin-left: 40px;">
|
||||
<table cellspacing="2" border="1" style="text-align: left;">
|
||||
<tbody>
|
||||
<tr>
|
||||
<td style="vertical-align: top; font-weight: bold;">ZONE<br>
|
||||
</td>
|
||||
<td style="vertical-align: top; font-weight: bold;">INTERFACE<br>
|
||||
</td>
|
||||
<td style="vertical-align: top; font-weight: bold;">BROADCAST<br>
|
||||
</td>
|
||||
<td style="vertical-align: top; font-weight: bold;">OPTIONS<br>
|
||||
</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td style="vertical-align: top;">loc<br>
|
||||
</td>
|
||||
<td style="vertical-align: top;">eth1<br>
|
||||
</td>
|
||||
<td style="vertical-align: top;">192.168.1.255<br>
|
||||
</td>
|
||||
<td style="vertical-align: top;">...<br>
|
||||
</td>
|
||||
</tr>
|
||||
</tbody>
|
||||
</table>
|
||||
<br>
|
||||
</div>
|
||||
/etc/shorewall/hosts<br>
|
||||
<br>
|
||||
<div style="margin-left: 40px;">
|
||||
<table cellpadding="2" border="1" style="text-align: left;">
|
||||
<tbody>
|
||||
<tr>
|
||||
<td style="vertical-align: top; font-weight: bold;">ZONE<br>
|
||||
</td>
|
||||
<td style="vertical-align: top; font-weight: bold;">HOSTS<br>
|
||||
</td>
|
||||
<td style="vertical-align: top; font-weight: bold;">OPTIONS<br>
|
||||
</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td style="vertical-align: top;">loc1<br>
|
||||
</td>
|
||||
<td style="vertical-align: top;">eth1:192.168.1.8/29<br>
|
||||
</td>
|
||||
<td style="vertical-align: top;"><br>
|
||||
</td>
|
||||
</tr>
|
||||
</tbody>
|
||||
</table>
|
||||
</div>
|
||||
<br>
|
||||
You probably don't want Shorewall to set up infrastructure to route
|
||||
traffic
|
||||
between 'loc' and 'loc1' so you should add these two policies:<br>
|
||||
<div style="margin-left: 40px;"><br>
|
||||
<table cellpadding="2" border="1" style="text-align: left;">
|
||||
<tbody>
|
||||
<tr>
|
||||
<td style="vertical-align: top; font-weight: bold;">SOURCE<br>
|
||||
</td>
|
||||
<td style="vertical-align: top; font-weight: bold;">DEST<br>
|
||||
</td>
|
||||
<td style="vertical-align: top; font-weight: bold;">POLICY<br>
|
||||
</td>
|
||||
<td style="vertical-align: top; font-weight: bold;">LOG<br>
|
||||
LEVEL<br>
|
||||
</td>
|
||||
<td style="vertical-align: top; font-weight: bold;">RATE:BURST<br>
|
||||
</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td style="vertical-align: top;">loc<br>
|
||||
</td>
|
||||
<td style="vertical-align: top;">loc1</td>
|
||||
<td style="vertical-align: top;">NONE<br>
|
||||
</td>
|
||||
<td style="vertical-align: top;"><br>
|
||||
</td>
|
||||
<td style="vertical-align: top;"><br>
|
||||
</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td style="vertical-align: top;">loc1<br>
|
||||
</td>
|
||||
<td style="vertical-align: top;">loc<br>
|
||||
</td>
|
||||
<td style="vertical-align: top;">NONE<br>
|
||||
</td>
|
||||
<td style="vertical-align: top;"><br>
|
||||
</td>
|
||||
<td style="vertical-align: top;"><br>
|
||||
</td>
|
||||
</tr>
|
||||
</tbody>
|
||||
</table>
|
||||
<br>
|
||||
</div>
|
||||
<p><font size="2">Last updated 11/21/2003 - </font><font size="2"> <a
|
||||
href="support.htm">Tom Eastep</a></font> </p>
|
||||
<a href="copyright.htm"><font size="2">Copyright</font> © <font
|
||||
size="2">2003 Thomas M. Eastep.</font></a><br>
|
||||
</body>
|
||||
</html>
|
||||
Loading…
Reference in New Issue
Block a user