Specifications

Appendix C IR-IP Interface Module Installation and Operation Manual
C-12 Quick Setup Menu ASMi-31 Ver. 3.0
LAN IP Address
Used to enter the IP address for the IP router LAN interface. This is the address
to which nodes connected to the local LAN send packets addressed to the WAN.
LAN IP Mask
Used to enter the IP subnet mask. The IP router supports a maximum of 254
hosts on the LAN, therefore you must use Class C subnet masks. The basic
subnet IP mask for Class C addresses, which supports the maximum possible
number of hosts, 254, is 255.255.255.0. To help you understand the selection of
IP subnet masks,
Figure C-7 provides a configuration example for a LAN with 6
nodes: the IP subnet mask for a 6-node IP network is 255.255.255.248.
ASMi-31 with IR-IP
.6.5.4.3192.168.1.2
LAN IP Address: 192.168.1.2
IP Address
.248.248.248.248255.255.255.248
Mask: 255.255.255.248
Mask
192.168.1.1192.168.1.1192.168.1.1192.168.1.1192.168.1.1Default Gateway
Figure C-7. Selecting the IP Subnet Mask
WAN IP Address
Used to enter the IP address for the IR-IP WAN interface, i.e., the IP address to be
used by IP hosts on the WAN to reach this IR-IP interface module.
If the WAN IP Address field remain blank, IR-IP operates in the Unnumbered
Router Mode.
WAN IP Mask
Used to enter the IP subnet mask for the WAN interface.
Default Gateway
Operation without Default Gateway
The IP interface module is intended to enable the extension of LANs through the
ASMi-31 link. Therefore, its default routing operation is different from the default
routing operation of standard IP routers:
• IR-IP forwards packets with destinations not located on the local LAN through
the WAN interface
• Packets received from the WAN interface and destined to hosts located on
the local LAN are forwarded to the LAN; other packets are discarded.