144 lines
9.4 KiB
HTML
144 lines
9.4 KiB
HTML
<?xml version="1.0" encoding="UTF-8"?>
|
|
<!DOCTYPE html
|
|
PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
|
|
<html lang="en-us" xml:lang="en-us">
|
|
<head>
|
|
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
|
|
<meta name="security" content="public" />
|
|
<meta name="Robots" content="index,follow" />
|
|
<meta http-equiv="PICS-Label" content='(PICS-1.1 "http://www.icra.org/ratingsv02.html" l gen true r (cz 1 lz 1 nz 1 oz 1 vz 1) "http://www.rsac.org/ratingsv01.html" l gen true r (n 0 s 0 v 0 l 0) "http://www.classify.org/safesurf/" l gen true r (SS~~000 1))' />
|
|
<meta name="DC.Type" content="concept" />
|
|
<meta name="DC.Title" content="Routing with point-to-point" />
|
|
<meta name="abstract" content="You can get your data from your local system to a remote system or from a local network to a remote network with point-to-point connections. This explains two concepts used in configuring IP addresses for a point-to-point connection." />
|
|
<meta name="description" content="You can get your data from your local system to a remote system or from a local network to a remote network with point-to-point connections. This explains two concepts used in configuring IP addresses for a point-to-point connection." />
|
|
<meta name="DC.Relation" scheme="URI" content="rzajwrcb.htm" />
|
|
<meta name="DC.Relation" scheme="URI" content="../rzaiy/rzaiygetstart.htm" />
|
|
<meta name="copyright" content="(C) Copyright IBM Corporation 1998, 2006" />
|
|
<meta name="DC.Rights.Owner" content="(C) Copyright IBM Corporation 1998, 2006" />
|
|
<meta name="DC.Format" content="XHTML" />
|
|
<meta name="DC.Identifier" content="rzajwptop" />
|
|
<meta name="DC.Language" content="en-us" />
|
|
<!-- All rights reserved. Licensed Materials Property of IBM -->
|
|
<!-- US Government Users Restricted Rights -->
|
|
<!-- Use, duplication or disclosure restricted by -->
|
|
<!-- GSA ADP Schedule Contract with IBM Corp. -->
|
|
<link rel="stylesheet" type="text/css" href="./ibmdita.css" />
|
|
<link rel="stylesheet" type="text/css" href="./ic.css" />
|
|
<title>Routing with point-to-point</title>
|
|
</head>
|
|
<body id="rzajwptop"><a name="rzajwptop"><!-- --></a>
|
|
<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
|
|
<h1 class="topictitle1">Routing with point-to-point</h1>
|
|
<div><p>You can get your data from your local system to a remote system
|
|
or from a local network to a remote network with point-to-point connections.
|
|
This explains two concepts used in configuring IP addresses for a point-to-point
|
|
connection.</p>
|
|
<p>Point-to-point connections are typically used to connect two systems together
|
|
over a wide area network (WAN). You can use a point-to-point connection to
|
|
get data from your local system to a remote system or to get data from a local
|
|
network to a remote network. Do not confuse point-to-point connections with
|
|
Point-to-Point Protocol. Point-to-Point Protocol (PPP) is one type of a point-to-point
|
|
connection that is commonly used to connect a computer to the Internet. See
|
|
PPP connections for more information about how to set up and manage your PPP
|
|
connections.</p>
|
|
<p>You can use point-to-point connections across dial-up lines, leased lines,
|
|
and other types of networks such as frame relay. There are two ways that you
|
|
can configure the IP addresses for a point-to-point connection: a numbered
|
|
connection or an unnumbered connection. As the names imply, a numbered connection
|
|
has a unique IP address defined for each interface. An unnumbered connection
|
|
does not use additional IP addresses for a connection.</p>
|
|
<div class="section"><h4 class="sectiontitle">Numbered network connections</h4><p>On the surface, it
|
|
seems that the simplest way to configure a point-to-point connection is by
|
|
using a numbered connection. A numbered connection is a point-to-point definition
|
|
that has a unique IP address defined for each end of a connection.</p>
|
|
<p>Here
|
|
are some points to keep in mind when you consider a numbered point-to-point
|
|
connection:</p>
|
|
<ul><li>Each end of the connection has a unique IP address.</li>
|
|
<li>Routing statements must be added to your system to flow the traffic to
|
|
the remote system.</li>
|
|
<li>Addresses on the point-to-point link must be managed by your network administrator.</li>
|
|
<li>Addresses are used up just to connect two systems.</li>
|
|
</ul>
|
|
<p>When each point-to-point connection is defined to your iSeries™ server,
|
|
a routing entry must be made on each end to describe how to get to any network
|
|
at the other end of the connection. The routing selection process on your iSeries server
|
|
depends on having an IP address for each interface. These addresses and routes
|
|
must be managed by your network administrator. In a small network, these addresses
|
|
are easy to keep track of and do not use many additional addresses. In a large
|
|
network, however, it might take an entire subnet of addresses just to define
|
|
an interface at each end.</p>
|
|
<p>The following figure shows a numbered network
|
|
connection between two iSeries servers. A routing entry is not needed if
|
|
all you want to do is communicate from AS1 to AS2. If you want to communicate
|
|
with systems in the remote network (10.1.2.x), the routing entry included
|
|
in the figure must be added to each system. This is because the remote network,10.1.2.x,
|
|
is a part of the 192.168.1.x connection.</p>
|
|
<br /><img src="rzajw521.gif" alt="Numbered network connection" /><br /></div>
|
|
<div class="section"><h4 class="sectiontitle">Unnumbered network connections</h4><p>An unnumbered connection
|
|
is a more complex method of defining a point-to-point connection than a numbered
|
|
connection. However, you might find the unnumbered connection a simpler and
|
|
better way to manage your network.</p>
|
|
<p>The routing selection process in
|
|
the iSeries server
|
|
depends on having an IP address for an interface. In an unnumbered connection,
|
|
the point-to-point interface does not have a unique address. The IP address
|
|
of your iSeries server
|
|
interface for an unnumbered connection is actually the IP address of the remote
|
|
system.</p>
|
|
<p>Points to keep in mind while considering an unnumbered connection:</p>
|
|
<ul><li>The point-to-point interface has an address that appears to be in the
|
|
remote network.</li>
|
|
<li>Routing statements are not needed in the system.</li>
|
|
<li>Your network administration is simplified by not using up IP addresses
|
|
for the link.</li>
|
|
</ul>
|
|
<p>In the following example, AS1 appears to have an interface in the
|
|
10.1.4.x network and AS2 appears to have an interface in the 10.1.3.x network.
|
|
The AS1 is connected to LAN network 10.1.3.x with an address of 10.1.3.1.
|
|
This allows AS1 to communicate with any system on the 10.1.3.x network directly.</p>
|
|
<br /><img src="rzajw502.gif" alt="Unnumbered network connection" /><br /><p>Also shown in the example is AS2. AS2 is connected to LAN network
|
|
10.1.4.x with an address of 10.1.4.1. This allows AS2 to communicate with
|
|
any system on the 10.1.4.x network directly. Each system (AS1 and AS2) adds
|
|
the remote address to its routing table as a local interface. The address
|
|
is treated specially so that packets destined for that address will not be
|
|
processed locally. The packets for the remote address will be placed on the
|
|
interface and transported to the other end of the connection. When the packet
|
|
arrives at the other end of the connection, normal packet processing is used.</p>
|
|
<p>Now
|
|
you have a need to connect AS1 to the 10.1.4.x network and to connect AS2
|
|
to the 10.1.3.x network. If these two systems were in the same room, you can
|
|
simply add a LAN adapter to each system and plug the new interface into the
|
|
correct LAN. If you did this, AS1 and AS2 would not need any routing entries
|
|
added. In this example, however, the systems are in different cities so you
|
|
must use a point-to-point connection. Even though you are using a point-to-point
|
|
connection, you might still want to avoid adding routing entries. By defining
|
|
the Point-to-Point Protocol (PPP) connection as an unnumbered connection,
|
|
you achieve the same results that you can get if you use LAN adapters without
|
|
adding any routing entries to your iSeries server. To do this, each system
|
|
borrows the IP address of the remote system for use with route resolution.</p>
|
|
</div>
|
|
<div class="section"><h4 class="sectiontitle">Unnumbered versus numbered connection data flow</h4><p>The
|
|
following figure shows the addresses that will be used in a numbered and unnumbered
|
|
point-to-point connection. The top half of the picture shows, that with a
|
|
numbered connection, the remote system address of 192.168.1.2 or 10.1.2.1
|
|
could be used to reach the remote system. This is because there is a routing
|
|
entry in AS3 that directs packets for 10.1.2.1 to 192.168.1.2 as the next
|
|
hop. The addresses used in the return packet are based on the received packet.
|
|
The bottom of the figure shows the addresses used with an unnumbered connection.
|
|
The outbound packet has a source of 10.1.3.1 and a destination of 10.1.4.1.
|
|
No routing entries are needed on either system because the systems have a
|
|
direct interface to the remote network by using the remote system address
|
|
of the point-to-point connection.</p>
|
|
<br /><img src="rzajw503.gif" alt="Unnumbered vs. numbered" /><br /></div>
|
|
</div>
|
|
<div>
|
|
<div class="familylinks">
|
|
<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>
|
|
</div>
|
|
<div class="relconcepts"><strong>Related concepts</strong><br />
|
|
<div><a href="../rzaiy/rzaiygetstart.htm">PPP connections</a></div>
|
|
</div>
|
|
</div>
|
|
</body>
|
|
</html> |