System information

156
AS/400 IBM Network Station: Techniques for Deployment in a WAN
5.7.6 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 the DHCP server for twinax support.
3. Configure and start the twinax IBM Network Station.
4. Test connectivity.
5.7.7 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 do 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.
Refer to Figure 65 on page 157 for a visual representation of the address
space that is allocated to the twinax subnet.
Depending on the TCP/IP addressing scheme of your network, you must
ensure that the address pool, that you use for your twinax subnet, is not
duplicated in a pool on another DHCP server within the same network.
Operations Navigator DHCP server configuration does not allow you to
create duplicate IP addresses in two subnets on the
same DHCP server.
If you have the ability, in your network, to allocate 64 IP addresses to the
twinax subnet, you should do so. 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