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LAN Interface Supplement 8-15
General Troubleshooting
Subnets and Gateways
Subnets and Gateways
When you configure your analyzer as described in “Configuring the
Analyzer” on page 1-8, you should enter a value for Gateway IP Address
and Subnet Mask if they are required with your LAN. Your network
administrator can tell you if you need to enter these values, and will
supply you with the values to enter. This section provides some basic
information on subnets and gateways.
In large systems, the LAN is often split into subnets. Each subnet is
isolated from other subnets by a router. Each subnet uses a unique and
contiguous range of IP addresses for its hosts. The router acts as the
"gateway" between the subnets. The router decides whether or not LAN
traffic is allowed from one subnet to another.
See Figure 8-3 on page 8-16. This illustration shows a portion of a LAN
system that includes a router (gateway) and two subnets, each including
two hosts.
Each host is a unique device (such as a computer or an analyzer) with a
unique IP address. The router also has a unique IP address.