System information

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AS/400 IBM Network Station: Techniques for Deployment in a WAN
5.6.6 Task Summary
The following tasks are required to complete this scenario:
1. Plan and assign the TCP/IP addressing for the twinax subnet.
2. Configure and start the twinax IBM Network Station.
3. Configure an AS/400 IP interface as determined by messages logged in
the QSYSOPR message queue.
5.6.7 Planning the TCP/IP Addressing Scheme
In a TCP/IP network, with a potential of multiple subnets and TCP/IP address
ranges, it is imperative to carefully administer an addressing scheme for use
by the twinax subnet.
For this scenario, Class A private IP addresses are used. These addresses
cannot be routed through the internet. However, they provide good growth
potential for your network in the future.
The network for this scenario is 10.1.1.0 with a subnet of 255.255.255.0.
From this existing address space, we use a contiguous range of 64 IP
addresses for use by the twinax IBM Network Stations. Applying a mask of
255.255.255.192 (which gives the maximum allowed TCP/IP address range
of 64 that can be used on a twinax subnet) to this network of 10.1.1.0 gives
us an address range of 10.1.1.192 to 10.1.1.255. Because this address range
is a subset of the main network (10.1.1.0), Proxy ARP is enabled
automatically.
The subnet boundaries in this group cannot be used. In this particular subnet,
the addresses of 10.1.1.192 and 10.1.1.255 are not available, because 192 is
used as the subnet address and 255 is used as the broadcast address. The
Depending on the TCP/IP addressing scheme of your network, you must
ensure that the address pool, which your are configuring for your twinax
subnet, is not duplicated in another pool within the entire network.
If you have the ability in your network to allocate 64 IP addresses to the
twinax subnet, you should do so and realize that some of the IP addresses
will not be used. It becomes difficult, in networks other than class A, to
reallocate and shift addressing schemes to gain another IP address to
install additional twinax IBM Network Stations.
Note