20
SI-Ethernet User Guide
Issue: 3
5.7.2
Using DHCP
If DHCP is used, it is recommended that the allocated IP address is bound to the MAC address of
the Ethernet interface, this strategy prevents the IP address changing on the Ethernet interface.
Any leased addresses should be leased permanently to prevent IP address changes.
5.8
Basic principles of routing
Routing is required to get TCP/IP packets from one subnet to another. In an IP network, nodes from
one subnet cannot communicate directly with nodes on a different subnet. To allow nodes to
communicate, a router (
or similar device
) is required to allow the two subnets to exchange data.
This means that any node wishing to communicate with a node that is not on its own subnet, must
know the address of a router that is on its own subnet. This is sometimes called a gateway or
default gateway.
If the SI-Ethernet module is configured to use DHCP and the module requires
exchanging, the new SI-Ethernet module will have a different MAC address and hence
the DHCP server will issue the new module with a different IP address.
NOTE
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