69 lines
4.6 KiB
HTML
69 lines
4.6 KiB
HTML
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<meta name="DC.Type" content="concept" />
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<meta name="DC.Title" content="Transparent subnets" />
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<meta name="abstract" content="You can use transparent subnets as a way to extend the proxy ARP concept." />
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<title>Transparent subnets</title>
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<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">Transparent subnets</h1>
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<div><p>You can use transparent subnets as a way to extend the proxy
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ARP concept.</p>
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<p>Transparent subnets work for a single host so that you can connect to an
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entire subnet or range of hosts. You can see in the follwing figure that the
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stub networks (10.1.1.x through 10.1.3.x) are assigned addresses out of the
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primary network address space (10.1.x.x).</p>
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<br /><img src="rzajw522.gif" alt="Example of a transparent subnet" /><br /><p>The twinaxial LANs are defined in address ranges that are within the real
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LAN address range. Prior to V4R2, the edits on the add TCP/IP route and add
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TCP/IP interface did not allow this to happen. In V4R2 the edits were relaxed.
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This allows two interfaces in different segments to have addresses that look
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like they are in the same segment. When the iSeries™ server sees this happen, it automatically
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performs a proxy ARP for any systems that are attached behind the twinaxial
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controller. This allows all the systems on the 10.1.x.x network to communicate
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with all the subnet systems with no changes to the systems on the 10.1.x.x
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network.</p>
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<div class="section"><h4 class="sectiontitle">Transparent subnetting over WANs</h4><p>The transparent
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subnet function can be further expanded to handle real LANs that are remotely
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located. Transparent subnetting over WANs makes remote networks appear to
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be connected to the home network. In the preceding figure, three networks
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are attached to the home 10.1.x.x network through the iSeries server. These networks are all
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defined using a subnet mask that makes them transparent to the home network.
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Proxy ARP responds to any ARP request on the home network for systems in the
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10.1.1.x, 10.1.2.x and 10.1.3.x subnets. This causes the traffic for the home
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network to be routed automatically to the iSeries server in the home network. This iSeries server
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in turn routes the data to the correct remote iSeries server. The remote iSeries server
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either processes the data, or forwards it to the correct system within the
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remote LAN. The workstations in the remote LAN must have a default route that
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points to the remote iSeries server in their network as the first hop
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gateway. The workstations in the home LAN do not need any additional routing
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entries because no new logical networks are created.</p>
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</div>
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</div>
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<div>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rzajwproxyarp.htm" title="Proxy Address Resolution Protocol (ARP) provides connectivity between physically separate networks without creating any new logical networks and without updating any routing tables. This topic also contains a description of transparent subnets, which is an extension to the proxy ARP routing technique.">Proxy Address Resolution Protocol routing</a></div>
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