70 lines
4.8 KiB
HTML
70 lines
4.8 KiB
HTML
<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE html
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PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html lang="en-us" xml:lang="en-us">
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<meta name="DC.Type" content="concept" />
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<meta name="DC.Title" content="Proxy Address Resolution Protocol routing" />
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<meta name="abstract" content="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." />
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<meta name="description" content="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." />
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<meta name="copyright" content="(C) Copyright IBM Corporation 1998, 2006" />
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<link rel="stylesheet" type="text/css" href="./ibmdita.css" />
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<link rel="stylesheet" type="text/css" href="./ic.css" />
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<title>Proxy Address Resolution Protocol routing</title>
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</head>
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<body id="rzajwproxyarp"><a name="rzajwproxyarp"><!-- --></a>
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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">Proxy Address Resolution Protocol routing</h1>
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<div><p>Proxy Address Resolution Protocol (ARP) provides connectivity between
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physically separate networks without creating any new logical networks and
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without updating any routing tables. This topic also contains a description
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of transparent subnets, which is an extension to the proxy ARP routing technique.</p>
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<p>ARP routing allows physically distinct, separate networks to appear as
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if they were a single logical network. It allows systems that are not directly
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connected to a LAN to appear to other systems on the LAN as though they are
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connected. This is useful in dial-up scenarios to provide connections to the
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entire network from a dial-in interface. The following figure shows a possible
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scenario. The 10.1.1.x is your home LAN and the 10.1.1.65 through 10.1.1.68
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are your remote systems.</p>
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<br /><img src="rzajw500.gif" alt="ProxyARP" /><br /><p>When a system on your home LAN (10.1.1.x) wants to send data to one of
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your remote systems, it will first do an ARP request. This is a broadcast
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that goes out to all your systems attached to the LAN segment to request the
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address of the target system. However, a remotely connected system will not
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see the broadcast. This is where the proxy ARP comes in. The iSeries™ server
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knows which systems are connected remotely. If your iSeries server sees an ARP request for
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one of your remotely connected machines, your iSeries server will reply to the ARP
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request with its address. Your iSeries server in turn receives the data
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and forwards it to the remote system. For this forwarding to take place, IP
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forwarding must be set to *yes. If your remote system is not connected, your iSeries server
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will not reply to the ARP request and the requesting system will not send
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data.</p>
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<p>You can use transparent subnets as a proxy for an entire subnet, or range
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of hosts. Transparent subnetting allows stub networks to be assigned addresses
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out of the primary network address space.</p>
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</div>
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<div>
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<ul class="ullinks">
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<li class="ulchildlink"><strong><a href="rzajwtsg.htm">Transparent subnets</a></strong><br />
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You can use transparent subnets as a way to extend the proxy ARP concept.</li>
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</ul>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rzajwrcb.htm" title="Routing deals with what path the network traffic follows from its source to its destination and how that path is connected.">Routing connectivity methods</a></div>
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</div>
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</div>
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</body>
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</html> |